Sharon Vadas

Sharon and River

NorthWest Research Associates, Inc.; 3380 Mitchell Lane; Boulder, CO 80301, USA;

Phone: (303) 415-9701 (x 202); Fax: (303) 415-9702;

vasha at nwra.com


Senior Research Scientist, NorthWest Research Associates, Inc., CoRA, Boulder, CO

Specialized professional competence:

* Theoretical and numerical work with atmospheric gravity waves (GWs)

* Modeling of the gravity waves excited by deep convection, body forces/heat/coolings, tsunamis and ocean wave packets

* Propagation and dissipation of GWs in the thermosphere via ray tracing

* Reconstruction of the GW field in the thermosphere via ray tracing with GW phases

Representative recent research:

* Developed a new compressible model for the excitation of GWs from tsunamis and oceans wave packets. Developed a new model for sprinkling GW spectra (with unique phases) into the ocean wave packet region, ray tracing the GWs into the thermosphere (with thermospheric dissipation), and reconstructing the GW field there.

* Calculated the response of the thermosphere and ionosphere to gravity wave (GW) dissipation in the thermosphere from force/heat/cooling. Found that this dissipation process creates localized thermospheric body forces. Determined that these body forces excite medium and large-scale secondary GWs and horizontal neutral winds that are variable in space and time

* Extracted the neutral, background winds at z=180-250 km using PFISR data of a propagating GWs. Also estimated the source of this wave to be secondary GWs excited from mountain wave breaking NW of Poker Flat, Alaska

* Estimated the thermospheric spectra from a deep convective plume and white noise, and found that the GW horizontal and vertical wavelengths increase significantly with altitude.

* Calculated the dissipation altitudes, maximum vertical wavelengths, horizontal distances traveled, and time take to travel these distances for a wide range of GWs in a variety of thermospheric temperatures and from launch altitudes in the lower atmosphere and thermosphere

* Developed a 3D ray-trace code which includes the most important forms of thermospheric dissipation for high-frequency GWs from the lower atmopshere

* Derived an anelastic GW dispersion relation which includes the most important forms of dissipation for high-frequency GWs from the lower atmopshere

* Derived the Boussinesq and compressible GW and mean responses to intermittent body forces and heatings

* Studied the excitation of GWs from deep convective plumes, clusters and mesoscale convective complexes, ray traced the GWs into the mesosphere, and compared with OH data of concentric rings from deep convection

* Studied the excitation of waves from multiple and intermittent horizontal and vertical body forcings

Other professional experience:

* Postdoc at LASP with Dr. D. Fritts at the University of Colorado, Boulder, Oct. 1995 - Jan. 1997;

* Presidents Postdoctoral Fellow, Center for Particle Astrophysics, University of California, Berkeley, Sept. 1993 - Sept. 1995;

* Guest Scientist in Numerical Cosmology, Theoretical Astrophysics, Fermi National Accelerator Lab, Jan. - Aug. 1993.

Academic Background:

* B.A. in physics and chemistry (1987), University of Rochester, USA;

* M.A. in physics (1990), University of Chicago, USA;

* Ph.D. in physics (1993), University of Chicago, USA.

Awards and Honors:

* CEDAR Prize Lecturer (2008): "The coupling of the lower atmosphere to the thermosphere via gravity wave excitation, propagation and dissipation"

* Top 10-most cited paper in JGR Space Physics in 1/1/2022-12/31/2023 (Vadas et al., 2023b, Primary and secondary gravity waves and large-scale wind changes generated by the Tonga volcanic eruption on 15 January 2022: Modeling and comparison With ICON-MIGHTI winds)

* Associate Editor, Journal of Geophysical Research, Space Physics, 1 January - 31 December 2014

SUBMITTED:

N.A. Frissell, V.L. Harvey, E. Becker, S.R. Phillips, K. Bossert, S. Derghazarian, L.P. Goncharenko, M.L. West, D.S. Sanchez, G.W. Perry, W.D. Engelke, R.B. Gerzoff, D.M. Diehl, R. Collins, S.L. Vadas, J.M. Ruohoniemi, and J. B. H. Baker, “First Observations Linking Large-Scale Traveling Ionospheric Disturbances to Polar Vortex Strength”, submitted to GRL 17 February 2024.

S.L. Vadas, D.R. Themens , J.D. Huba, E. Becker, K. Bossert, L. Goncharenko, S.J. Maguire, C.A.O.B. Figueiredo, S. Xu, V.L. Harvey , N.A. Frissell , M.J. Molzen, T.J. Pisano, G. Nykiel, "Higher-order gravity waves and traveling ionospheric disturbances from the polar vortex jet on 11-15 January 2016: Modeling with HIAMCM-SAMI3 and comparison with observations in the thermosphere and ionosphere”, submitted to JGR Space Physics 10 July 2024. Pdf version of this paper

IN PRESS:

NA

PEER-REVIEWED PUBLICATIONS:

S. L. Vadas, E. Becker, K. Bossert, Y. Hozumi, G. Stober, V.L. Harvey , G. Baumgarten and Lars Hoffmann (2024), "The role of the polar vortex jet for secondary and higher‐order gravity waves in the northern mesosphere and thermosphere during 11–14 January 2016”, JGR Space Physics, 129, e2024JA032521. https://doi.org/10.1029/2024JA032521. Pdf version of this paper Suppl file movie S1 movie S2 movie S3 movie S4 movie S5 movie S6 movie S7 movie S8 movie S9 movie S10 movie S11 movie S12

Stober, G., Vadas, S. L., Becker, E., Liu, A., Kozlovsky, A., Janches, D., Qiao, Z., Krochin, W., Shi, G., Yi, W., Zeng, J., Brown, P., Vida, D., Hindley, N., Jacobi, C., Murphy, D., Buriti, R., Andrioli, V., Batista, P., Marino, J., Palo, S., Thorsen, D., Tsutsumi, M., Gulbrandsen, N., Nozawa, S., Lester, M., Baumgarten, K., Kero, J., Belova, E., Mitchell, N., Moffat-Griffin, T., and Li, N. (2024), “Gravity waves generated by the Hunga Tonga–Hunga Ha’apai volcanic eruption and their global propagation in the mesosphere/lower thermosphere observed by meteor radars and modeled with the High-Altitude general Mechanistic Circulation Model”, Atmos. Chem. Phys., 24, 4851-4873, doi:10.5194/acp-24-4851-2024. Pdf version of this paper

Gasque, L.C., B. J. Harding, T. J. Immel1, Y.-J. Wu, C. C. Triplett, S.L. Vadas, E. Becker and A. Maute (2024) “Evening solar terminator waves in Earth’s thermosphere: Neutral wind signatures observed by ICON/MIGHTI”, JGR Space Physics, 129, e2023JA032274. https://doi.org/10.1029/2023JA032274. Pdf version of this paper

Horváth, A., S.L. Vadas, C. C. Stephan, and S.A. Buehler (2024), "One-minute resolution GOES-R observations of Lamb and gravity waves triggered by the Hunga Tonga-Hunga Ha’apai Eruptions on 15 January 2022", JGR Atmospheres,129, doi: 10.1029/2023JD039329. Pdf version of this paper

Xu, S., Vadas, S. L., & Yue, J. (2024). Quiet time thermospheric gravity waves observed by GOCE and CHAMP. Journal of Geophysical Research: Space Physics, 129, e2023JA032078. https://doi.org/10.1029/2023JA032078 Pdf version of this paper

Figueiredo, C.A.O.B., Vadas, S.L., Becker, E., Wrasse, C. M., Takahashi,H., Nyassor, P. K., and Barros, D. (2023b), “Secondary gravity waves from the Tonga volcano eruption: Observation and modeling over New Zealand and Australia”, JGR Space Physics, 128, e2023JA031476. doi.org/10.1029/2023JA031476. Pdf version of this paper

Figueiredo, C.A.O.B., C.M. Wrasse, S.L. Vadas, H. Takahashi, Y. Otsuka, P. K. Nyassor, K. Shiokawa, I. Paulino, and D. Barros , (2023a), “Daytime medium scale traveling ionospheric disturbances (MSTIDS) over the Andes Mountains at equatorial and low magnetic latitudes”, JGR Space Physics, 128, e2023JA031477, doi.org/10.1029/2023JA031477 Pdf version of this paper

Günzkofer, F., D. Pokhotelov, G. Stober, I. Mann, S. L. Vadas, E. Becker, A. Tjulin, A. Kozlovsky, M. Tsutsumi, N. Gulbrandsen, S. Nozawa, M. Lester, E. Belova, J. Kero, N.J. Mitchell, and C. Borries (2023), “Inferring neutral winds in the ionospheric transition region from atmospheric-gravity-wave traveling-ionospheric-disturbance (AGW-TID) observations with the EISCAT VHF radar and the Nordic Meteor Radar Cluster”, Annales Geophysicae, 41, 409–428, doi.org/10.5194/angeo-41-409-2023. Pdf version of this paper

S. L. Vadas, C.A.O.B. Figueiredo, E. Becker, J. D. Huba, D. R. Themens, N. Hindley, S. Mrak, I. Galkin and K. Bossert (2023), “Traveling ionospheric disturbances induced by the secondary gravity waves from the Tonga eruption on 15 January 2022: Modeling with MESORAC-HIAMCM-SAMI3 and comparison with GPS/TEC and ionosonde data”, JGR Space Physics, 128, e2023JA031408, https://doi.org/10.1029/2023JA031408. Pdf version of this paper

S. L. Vadas, E. Becker, C.A.O.B. Figueiredo, K. Bossert, B. Harding, L.C. Gasque (2023), “Primary and secondary gravity waves and large-scale wind changes generated by the Tonga volcanic eruption on 15 January 2022: Modeling and comparison with ICON-MIGHTI winds”, JGR Space Physics, 128, e2022JA031138. https://doi.org/10.1029/2022JA031138 Pdf version of this paper

S.L. Vadas, E. Becker, K. Bossert, G.Baumgarten, L. Hoffmann and V. Lynn Harvey , "Secondary gravity waves from the stratospheric polar vortex over ALOMAR Observatory on 12-14 January 2016: observations and modeling", Journal of Geophysical Research: Atmospheres, 128, e2022JD036985. https://doi.org/10.1029/2022JD036985 Pdf version of this paper

* Huba, J. D., Becker, E., & Vadas, S. L. (2023). Simulation study of the 15 January 2022 Tonga event: Development of super equatorial plasma bubbles. Geophysical Research Letters, 50, e2022GL101185. https://doi.org/10.1029/2022GL101185 Pdf version of this paper

* Becker, E., Goncharenko, L., Harvey, V. L., & Vadas, S. L., 2022b, Multi-step vertical coupling during the January 2017 sudden stratospheric warming. Journal of Geophysical Research: Space Physics, 127, e2022JA030866, https://doi.org/10.1029/2022JA030866 Pdf version of this paper

* H. Yang, M. Hernandez-Pajares, W. Jarmołowski, P. Wielgosz, S.L. Vadas, et al., "Systematic detection of anomalous ionospheric perturbations above LEOs From GNSS POD data including possible tsunami signatures", IEEE Transactions on Geoscience and Remote Sensing, vol. 60, pp. 1-23, 2022, Art no. 5803423, doi: 10.1109/TGRS.2022.3182885.

* Heale, C. J., Bossert, K., & Vadas, S. L., 2022, “3D numerical simulation of secondary wave generation from mountain wave breaking over Europe, JGR Atmospheres, 127, e2021JD035413, https://doi.org/10.1029/2021JD035413 Pdf version of this paper

* Becker, E. , S.L. Vadas, K. Bossert, L. Harvey, C. Zulicke, and Lars Hoffmann (2022a), "A high-resolution whole-atmosphere model with resolved gravity waves and specified large-scale dynamics in the troposphere and stratosphere", JGR Atmospheres, 127, e2021JD035018, https://doi.org/10.1029/2021JD035018 Pdf version of this paper

* Xu, S., S.L. Vadas and J. Yue, 2021, "Thermospheric traveling atmospheric disturbances in austral winter from GOCE and CHAMP", JGR Space Physics, 126, e2021JA029335. https://doi.org/10.1029/2021JA029335 Pdf version of this paper

* Nyassor, P. K., C. M. Wrasse, D. Gobbi, I. Paulino, S.L. Vadas, K.P. Naccarato, H. Takahashi, J.V. Bageston, C.A.O.B. Figueiredo, D. Barros, 2021, "Case studies on concentric gravity waves source using lightning flash Rate, brightness temperature and backward ray tracing at São Martinho da Serra (29.44°S, 53.82°W)", JGR Atmospheres, 126, e2020JD034527. https://doi.org/10.1029/2020JD034527. Pdf version of this paper

Vadas, S.L. & I. Azeem, 2021, "Concentric secondary gravity waves in the thermosphere and ionosphere over the continental United States on March 25–26, 2015 from deep Convection", JGR Space Physics, 126, e2020JA028275. https://doi.org/10.1029/2020JA028275. Pdf version of this paper

* Bossert, K., S. L. Vadas, L. Hoffmann, M. Bramberger, E. Becker, V. L. Harvey, 2020, "Observations ofstratospheric gravity waves over Europeon 12 January 2016: The role of thepolar night jet", JGR Atmospheres, 125, https://doi.org/10.1029/2020JD032893. Pdf version of this paper

* Becker, E. and S.L. Vadas, 2020, "Explicit global simulation of gravity waves in the thermosphere", J. Geophys. Res., 10.1029/2020JA028034. Pdf version of this paper

* Kogure, M., J. Yue, T. Nakamura, L. Hoffmann, S.L. Vadas, Y. Tomikawa, M.K. Ejiri and Diego Janches, 2020, "First Direct Observational Evidence for Secondary Gravity Waves Generated by Mountain Waves over the Andes", GRL, 10.1029/2020GL088845. Pdf version of this paper

* Heale, C. J. , K. Bossert, S. L. Vadas, L. Hoffmann, A. Dörnbrack, G. Stobar, J. B. Snively, C. Jacobi (2020), Secondary gravity waves generated by breaking mountain waves over Europe, JGR Atmospheres, https://doi.org/10.1029/2019JD031662. Pdf version of this paper

* Vadas, S.L. and E. Becker, 2019, "Numerical modeling of the generation of tertiary gravity waves in the mesosphere and thermosphere during strong mountain wave events over the Southern Andes", J. Geophys. Res. Space Physics, 124. https://doi.org/10.1029/2019JA026694 Pdf version of this paper

* Vadas, S.L., S. Xu, J. Yue, K. Bossert, E. Becker, and G. Baumgarten, 2019, "Characteristics of the Quiet-time Hotspot Gravity Waves Observed by GOCE over the Southern Andes on 5 July 2010", J. Geophys. Res. Space Physics, 124. https://doi.org/10.1029/2019JA026693 Pdf version of this paper

Xu, S., Yue, J., Xue, X., Vadas, S. L., Miller, S. D., Azeem, I., et al. (2019). Dynamical coupling between Hurricane Matthew and the middle to upper atmosphere via gravity waves. Journal of Geophysical Research: Space Physics, 124. https://doi.org/10.1029/2018JA026453. Pdf version of this paper

* Liu, X., Xu, J., Yue, J., Vadas, S. L., & Becker, E. (2019). Orographic primary and secondary gravity waves in the middle atmosphere from 16‐year SABER observations. Geophysical Research Letters, 46. https://doi.org/10.1029/2019GL082256. Pdf version of this paper

* Vadas, S.L., J. Zhao, X. Chu and E. Becker, 2018, "The Excitation of secondary gravity waves from local body forces: Theory and observation", J. Geophys. Res. Atmospheres, 123, https://doi.org/10.1029/2017JD027970. Pdf version of this paper

* Vadas, S.L. and E. Becker, 2018, "Numerical modeling of the Excitation, propagation, and dissipation of primary and secondary gravity waves during wintertime at McMurdo Station in the Antarctic", J. Geophys. Res. Atmospheres, 123, https://doi.org/10.1029/2017JD027974. Pdf version of this paper

* Negale, M.R., M.J. Taylor , M.J. Nicolls, S.L. Vadas, K. Nielsen and Craig Heinselman, 2018, "Seasonal propagation characteristics of MSTIDs observed at high latitudes over central Alaska using the Poker Flat Incoherent Scatter Radar", J. Geophys. Res. Space Physics, https://doi.org/10.1029/2017JA024876. Pdf version of this paper

* Becker, E. and S.L. Vadas, 2018, "Secondary gravity waves in the winter mesosphere: Results from a high-resolution, gravity-wave resolving global circulation model", J. Geophys. Res. Atmospheres, 123, https://doi.org/10.1002/2017JD027460. Pdf version of this paper

* Negale, M.R., M.J. Taylor , M.J. Nicolls, S.L. Vadas, K. Nielsen and Craig Heinselman, 2018, "Seasonal propagation characteristics of MSTIDs observed at high latitudes over central Alaska using the Poker Flat Incoherent Scatter Radar", J. Geophys. Res. Space Physics, https://doi.org/10.1029/2017JA024876. Pdf version of this paper

* Becker, E. and S.L. Vadas, 2018, "Secondary gravity waves in the winter mesosphere: Results from a high-resolution, gravity-wave resolving global circulation model", J. Geophys. Res. Atmospheres, 123, https://doi.org/10.1002/2017JD027460. Pdf version of this paper

* Lu, X., X. Chu, H. Li, C. Chen,, J. A. Smith, and S. L. Vadas, 2017 , "Statistical characterization of high-to-medium frequency mesoscale gravity waves by lidar-measured vertical winds and temperatures in the MLT", J. Atmos. Solar Terres. Phys., 162 , 3–15, https://doi.org/10.1016/j.jastp.2016.10.009. Pdf version of this paper

* Vadas, S. L. and G. Crowley, 2017, "Neutral wind and density perturbations in the thermosphere created by gravity waves observed by the TIDDBIT sounder", J. Geophys. Res. Space Physics, 122, doi:10.1002/2016JA023828. Pdf version of this paper

* Azeem, I., S. L. Vadas, G. Crowley, and J. J. Makela, 2017, Traveling ionospheric disturbances over the United States induced by gravity waves from the 2011 Tohoku tsunami and comparison with gravity wave dissipative theory, J. Geophys. Res. Space Physics, 122, 3430–3447, doi:10.1002/2016JA023659. Pdf version of this paper

* Paulino, I., A. F. Medeiros, S. L. Vadas, C. M. Wrasse, H. Takahashi, R. A. Buriti, D. Leite, S. Filgueira, J. V. Bageston, J. H. A. Sobral, and D. Gobbi, 2016, Periodic waves in the lower thermosphere observed by OI630 nm airglow images, Ann. Geophys., 34, 293-301, doi:10.5194/angeo-34-293-2016. Pdf version of this paper

* Vadas, S. L., J. J. Makela, M. J. Nicolls, and R. F. Milliff, 2015, Excitation of gravity waves by ocean surface wave packets: Upward propagation and reconstruction of the thermospheric gravity wave field, JGR Space Physics, 120, doi:10.1002/2015JA021430. Pdf version of this paper

* J. Westerhoff, G. Earle, R. Bishop, G. R. Swenson, S. Vadas, J. Clemmons, R. Davidson, L. Fanelli, C. Fish, V. Garg, A. Ghosh, B. B. Jagannatha, E. Kroeker, P. Marquis, D. Martin, S. Noel, C. Orr, R. Robertson, 2015, “LAICE CubeSat mission for gravity wave studies”, Advances in Space Research, 56 (7), 1413—1427.

* Vadas, S.L., H.-L. Liu, and R.S. Lieberman, 2014, "Numerical modeling of the global changes to the thermosphere and ionosphere from the dissipation of gravity waves from deep convection", JGR Space Physics, 119, doi:10.1002/2014JA020280. Pdf version of this paper

* Vadas, S.L., H. Suzuki, M.J. Nicolls, T. Nakamura, Robert O. Harmon, 2014, "Acoustic and atmospheric gravity waves excited by a fireball meteor: observations and modeling" J. Geophys. Res. Atmospheres, 119, doi:10.1002/2014JD021664. Pdf version of this paper and Na airglow movie (supplemental movie)

* Nicolls, M.J., S.L. Vadas, N. Aponte, and M.P. Sulzer, 2014, "Horizontal parameters of daytime thermospheric gravity waves and E region neutral winds over Puerto Rico", J. Geophys. Res. Space Physics, 119, doi:10.1002/2013JA018988. Pdf version of this paper

* Suzuki, S., S.L. Vadas, K. Shiokawa, and Y. Otsuka, S. Kawamura, and Y. Murayama, 2013, “Typhoon-induced concentric airglow structures in the mesopause region", GRL, 40, 1–5, doi:10.1002/2013GL058087. Pdf version of this paper

* Vadas, S.L. and D.C, Fritts, 2013, "Corrigendum" to "Gravity wave radiation and mean responses to local body forces in the atmosphere", Jour. Atmos. Sci., 70, 2680. Pdf version of this paper

* Smith, S.M., S.L. Vadas, W.J. Baggaley, G. Hernandez, and J. Baumgardner, 2013, "Gravity Wave Coupling Between the Mesosphere and Thermosphere Over New Zealand", J. Geophys. Res, 118, doi:10.1002/jgra.50263. Pdf version of this paper

* Vadas, S.L. and H.-L. Liu, 2013: "The large-scale neutral and plasma responses to the body forces created by the dissipation of gravity waves from 6 hours of deep convection in Brazil", J. Geophys. Res, 118, 1–25, doi:10.1002/jgra.50249. Pdf version of this paper

* Suzuki, H., T. Nakamura, S.L. Vadas, M. Tsutsumi, M. Taguchi, and Y. Fujiwara, 2013, “Inertial gravity wave in the polar mesopause region infered from successive images of a meteor train”, J. Geophys. Res, 118, 3047–3052, doi:10.1002/jgrd.50228. Pdf version of this paper

* Liu, H.-L. and S. L. Vadas, 2013: "Large-scale ionospheric disturbances due to the dissipation of convectively-generated gravity waves over Brazil", J. Geophys. Res, 118, 2419–2427, doi:10.1002/jgra.50244. Pdf version of this paper

* Vadas, S. L., 2013: "Compressible f-plane solutions to body forces, heatings, and coolings, and application to the primary and secondary gravity waves generated by a deep convective plume", J. Geophys. Res., 118, doi:10.1002/jgra.50163. Pdf version of this paper

* Chen, C., X. Chu, A. J. McDonald, S.L. Vadas, Z. Yu, W. Fong and X. Lu, 2013, “Inertia-gravity waves in Antarctica: A case study using simultaneous lidar and radar measurements at McMurdo/Scott Base (77.8° S, 166.7° E)”, JGR, 118, 1–15, doi:10.1002/jgrd.50318. Pdf version of this paper

* Liu, X. Xu, J., Yue, J. and S. L. Vadas, 2013, "Numerical modeling study of the momentum deposition of small amplitude gravity waves in the thermosphere", Ann. Geophy., 31, 1–14. Pdf version of this paper

* Paulino, I., H. Takahashi, S.L. Vadas, C.M. Wrasse, J.H.A. Sobral, A.F. Medeiros, R.A. Buriti, D. Gobbi, 2012, "Forward ray tracing for medium-scale gravity waves observed during the COPEX campaign", J. Atmos. Solar Terres. Phys., 90-91, 117-123. Pdf version of this paper

* Vadas, S. L. and M. J. Nicolls, 2012, "The Phases and Amplitudes of Gravity Waves Propagating and Dissipating in the Thermosphere: Theory", J. Geophys. Res, 117, A05322, doi:10.1029/2011JA017426. Pdf version of this paper

* Nicolls, M. J., S. L. Vadas, J. W. Meriwether, M. G. Conde, and D. Hampton, 2012, “The Phases and Amplitudes of Gravity Waves Propagating and Dissipating in the Thermosphere: Application to Measurements over Alaska”, J. Geophys. Res, 117, A05323, doi:10.1029/2012JA017542. Pdf version of this paper

* Vadas, S.L., J. Yue, and T. Nakamura, 2012, ``Mesospheric concentric gravity waves generated by multiple convection storms over the North America Great Plain'', JGR, 117, D7, doi:10.1029/2011JD017025. Pdf version of this paper

* Nicolls, M. J., R. H. Varney, S. L. Vadas, P.A. Stamus, C. J. Heinselman, R. B. Cosgrove, and M. C. Kelley, 2010, "Case Study of an Inertia-Gravity Wave in the Mesosphere over Alaska with the Poker Flat Incoherent Scatter Radar", JGR, 115, D00N02, doi:10.1029/2010JD014042. Pdf version of this paper

* Makela, J.J., S.L. Vadas, R. Muryanto, T. Duly, and G. Crowley, 2010: "Periodic spacing between consecutive equatorial plasma bubbles", GRL, 37, L14103, doi:10.1029/2010GL043968. Pdf version of this paper

* Vadas, S.L. and G. Crowley, 2010: "Sources of the traveling ionospheric disturbances observed by the ionospheric TIDDBIT sounder near Wallops Island on October 30, 2007", JGR, 115, A07324, doi:10.1029/2009JA015053. Pdf version of this paper

* Earle, G.D. P. Bhaneja, P.A. Roddy, C.M. Swenson, A. Barjatya, R.L. Bishop, T.W. Bullett, G. Crowley, R. Redmon, K. Groves, R. Cosgrove, and S.L. Vadas, 2010. “A comprehensive rocket and radar study of midlatitude spread F'”, J. Geophys. Res., 115, A12339, doi:10.1029/2010JA015503. Pdf version of this paper

* Takahashi, H., M. A. Abdu, M. J. Taylor, P.‐D. Pautet, E. de Paula, E. A. Kherani, A. F. Medeiros, C. M. Wrasse, I. S. Batista, J. H. A. Sobral, D. Gobbi, D. Arruda, I. Paulino, S. Vadas, D. Fritts, 2010, "Equatorial ionosphere bottom-type spread F observed by OI 630.0 nm airglow imaging", GRL, 37, L03102, doi:10.1029/2009GL041802.

* Sharon L. Vadas and M.J. Keskinen, 2010: Correction to “Three-dimensional nonlinear evolution of equatorial ionospheric bubbles with gravity wave seeding and tidal wind effects'', GRL, 37, L03101, doi:10.1029/2009GL041216. Pdf version of this paper

* Sharon L. Vadas and Han-Li Liu, 2009: ``The Generation of Large-Scale Gravity Waves and Neutral Winds in the Thermosphere From the Dissipation of Convectively-Generated Gravity Waves'', JGR, 114, A10310, doi:10.1029/2009JA014108. pdf version of this paper

* Sharon L. Vadas and Mike Nicolls, 2009: "Temporal Evolution of Neutral, Thermospheric Winds and Plasma Response using PFISR Measurements of Gravity Waves" JASTP, 71, 740-770. Pdf version of this paper

* Taylor, M.J., P.-D. Pautet, A.F. Medeiros, R.A. Buriti, J. Fechine, D.C. Fritts, S.L. Vadas, H. Takahashi, and F.T. Sao Sabbas, 2009: "Characteristics of mesospheric gravity waves near the magnetic equator, Brazil during the SpreadFEx campaign", Ann. Geophys., 27, 461-472. Pdf version of this paper

* Fritts, D. C., Abdu, M. A., Batista, B. R., Batista, I. S., Batista, P. P., Buriti, R., Clemesha, B. R., Comberiate, J., Dautermann, T., de Paula, E., Fechine, B. J., Fejer, B., D.Gobbi, Haase, J., Kamalabadi, F., Laughman, B., Lima, P. P., Liu, H., Medeiros, A., Pautet, D., ao Sabbas, F. S., Sobral, J. H. A., Stamus, P., Takahashi, H., Taylor, M. J., Vadas, S. L., and Wrasse, C., 2007: "The Spread F Experiment (SpreadFEx): Program overview and first results", Earth, Planets and Space, 61, 411-430, 2009. Pdf version of this paper

* Fritts, D.C., M. A. Abdu, B. R. Batista, I. S. Batista, P. P. Batista, R. Buriti, B. R. Clemesha, T. Dautermann, E. de Paula, B. J. Fechine, B. Fejer, D. Gobbi, J. Haase, F. Kamalabadi, E. R. Kherani, B. Laughman, P. P. Lima, H.-L. Liu, A. Medeiros, D. Pautet, D. M. Riggin, F. S. Rodrigues, F.T. Sao Sabbas, J. H. A. Sobral, P. Stamus, H. Takahashi, M. J. Taylor, S. L. Vadas, F. Vargas, C. Wrasse, 2009: "Overview and Summary of the Spread F Experiment (SpreadFEx)", Annals Geoph., 27, 1-15. Pdf version of this paper

* Sharon L. Vadas, Jia Yue, Joe She, Pete Stamus, and Alan Liu, 2009: "A model study of the effects of winds on concentric rings of gravity waves from a convective plume near Fort Collins on 11 May 2004", Jour. Geoph. Res, 114, D06103, doi:10.1029/2008JD010753. Pdf version of this paper

* Yue, J., S.L. Vadas, C.-Y. She, T. Nakamura, S. Reising, D. Krueger, H.-Li Liu, P. Stamus, D. Thorsen, W. Lyons, T. Li, 2009: "A study of OH imager observed concentric gravity waves near Fort Collins on 11 May 2004", Jour. Geoph. Res, 114, D06104, doi:10.1029/2008JD011244. Pdf version of this paper

* Takahashi, H., M. J. Taylor, P.-D. Pautet, A. F. Medeiros, D. Gobbi, C. M. Wrasse, J. Fechine, M. A. Abdu, I. S. Batista, E. Paula, J.H.A. Sobral, D. Arruda, S. L. Vadas, F. S. Sabbas and D. C. Fritts, 2008: "Simultaneous observation of ionospheric plasma bubbles and mesospheric gravity waves during the SpreadFEx Campaign", Annals Geoph., 27, 1477-1487

* Sao Sabbas, F.T., V. T. Rampinelli, J. Santiago, P. Stamus, S.L. Vadas, G. Dolif Neto, 2008: "Characterization of convective gravity wave sources in satellite IR imagery", Annals Geoph., 27, 1279-1293.

* Fritts, D.C., S.L. Vadas, D.M. Riggin, M.A. Abdu, I.S. Batista, H. Takahashi, A. Medeiros, F. Kamalabadi, H.-L. Liu, B. J. Fejer,and M.J. Taylor, 2008: "Gravity wave and tidal influences on equatorial spread F based on observations during the spread F experiment (SpreadFEx)", Annals Geoph., 26, 3235-3252.

* Sharon L. Vadas and Dave C. Fritts, 2009: "Reconstruction of the gravity wave field excited by convective plumes via ray tracing in real space", Annals. Geophys., 27, 147-177. Pdf version of this paper

* Sharon L. Vadas, M.J. Taylor, P.-D. Pautet, P.A. Stamus, D.C. Fritts, H.-L. Liu, F.T. Sao Sabbas, V.T.Rampinelli, P. Batista, and H. Takahashi, 2009: "Convection: the likely source of the medium-scale gravity waves observed in the OH airglow layer near Brasilia, Brazil, during the SpreadFEx campaign", Ann. Geophys, 27, 231-259. Pdf version of this paper

* Dave C. Fritts and Sharon L. Vadas, 2008: "Gravity wave penetration into the thermosphere: Sensitivity to solar cycle variations and mean winds", Annals. Geophys, 26, 3841-3861. pdf version of this paper

* Sharon L. Vadas and Mike Nicolls, 2008: "Using PFISR Measurements and Gravity Wave Dissipative Theory to Determine the Neutral, Background Thermospheric Winds" Geoph. Res. Letters, 35, {L02105, doi:10.1029/2007GL031522} Pdf version of this paper

* Earle, G.D., A. Mwene-Musumba, and S.L. Vadas, 2008: "Satellite-Based measurements of gravity wave-induced Mid-latitude plasma density perturbations" J. Geoph. Res, 113, A03303, doi:10.1029/2007JA012766. Pdf version of this paper

* Sharon L. Vadas, 2007: "Horizontal and vertical propagation, and dissipation of gravity waves in the thermosphere from lower atmospheric and thermospheric sources", J. Geoph. Res., {112}'{A06305, doi:10.1029/2006JA011845}. Pdf version of this paper

* Fritts, D. C., S. L. Vadas, K. Wan, and J. A. Werne, 2006: "Mean and variable forcing of the middle atmosphere by gravity waves", J. Atmos. Solar-Terres. Phys., 68, 247-265. Pdf version of this paper

* Sharon L. Vadas and David C. Fritts, 2006: "The influence of solar variability on gravity wave structure and dissipation in the thermosphere from tropospheric convection", J. Geoph. Res., {111, A10S12}'{doi:10.1029/2005JA011510}. Pdf version of this paper

* Sharon L. Vadas and David C. Fritts, 2005: "Thermospheric responses to gravity waves: Influences of increasing viscosity and thermal diffusivity", J. Geoph. Res., 110, D15103; doi:10.1029/2004JD005574. Pdf version of this paper

* Sharon L. Vadas and David C. Fritts, 2004: "Thermospheric responses to gravity waves arising from mesoscale convective complexes", J. Atmos. Terr. Sci., 66, 781-804. Pdf version of this paper

* Sharon L. Vadas, David C. Fritts, and M. Joan Alexander, 2003: "Mechanism for the generation of secondary waves in wave breaking regions", Jour. Atmos. Sci., 60, 194--214. Pdf version of this paper

* Sharon L. Vadas and David C. Fritts, 2002: "The Importance of spatial variability in the generation of secondary gravity waves from local body forces," Geophys. Res. Lett., 29(20) 10.1029/2002GL015574 Pdf version of this paper

* David C. Fritts, Sharon L. Vadas, and Y. Yamada, 2002: "An estimate of strong local body forcing and gravity wave radiation based on OH airglow and meteor radar observations", Geophy. Res. Lett, 29(10) 10.1029/2001GL013753 Pdf version of this paper

* Ben Balsley, David C. Fritts, R. Frehlich, M. Jones, S.L. Vadas, R. Coulter, 2002: "Up-gully flow in the great plains region: a mechanism for perturbing the nightime lower atmosphere", Geophys. Res. Lett., 29(19) 10.1029/2002GL015435 Pdf version of this paper

* Sharon L. Vadas and David C. Fritts, 2001: "Gravity wave radiation and mean responses to local body forces in the atmosphere,"Jour. Atmos. Sci., 58, 2249--2279. Pdf version of this paper

* David C. Fritts, Sharon L. Vadas and Oyvind Andreassen, 1998: "Gravity wave excitation and momentum transport in the solar interior: Implications for a residual circulation and lithium depletion," Astronomy & Astrophysics, 333, 343-361

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Sharon and River, Christmas show 2019