Thomas R. Metcalf: Publications

  1. Evidence for Explosive Chromospheric Evaporation in a Solar Flare Observed With SMM, D. M. Zarro, K. T. Strong, R. C. Canfield, T. Metcalf, J. L. R. Saba, Adv. Space Res., Vol. 6, No. 6, pp. 155-158, 1986.

  2. A Novel Observational Test of Momentum Balance in a Solar Flare, Richard C. Canfield, Thomas R. Metcalf, Keith T. Strong, Dominic M. Zarro, Nature, 326, 165, 1987.

  3. The H-alpha Spectral Counterparts of Solar Hard X-ray Microflares, Richard C. Canfield, Thomas R. Metcalf, Astrophys. J., 321, 586, 1987.

  4. Explosive Plasma Flows in a Solar Flare, Dominic M. Zarro, Richard C. Canfield, Keith T. Strong, Thomas R. Metcalf, Astrophys. J., 324, 582, 1988.

  5. Coordinated Soft X-Ray and H-alpha Observations of Solar Flares, D.M. Zarro, R. C. Canfield, T. R. Metcalf, J. R. Lemen, Adv. Space Res., Vol. 8, No. 11, pp. 149-152, 1988.

  6. The Global Energy Balance in Flares, G. M. Simnett, G. A. Linford, and T. R. Metcalf, Proceedings of the Second Workshop on Thermal-Non-Thermal Interactions in Solar Flares, Rutherford Appleton Laboratory, 1989.

  7. Momentum Balance in Four Solar Flares, Richard C. Canfield, Dominic M. Zarro, Thomas R. Metcalf, James R. Lemen, Astrophys. J., 348, 333, 1990.

  8. Flare Heating and Ionization of the Low Solar Chromosphere: I. Inversion Methods for MgI 4571 and 5173Å, Thomas R. Metcalf, Richard C. Canfield, Eugene H. Avrett, Frederic T. Metcalf, Astrophys. J., 350, 463, 1990.

  9. Flare Heating and Ionization of the Low Solar Chromosphere: II. Observations of Five Solar Flares, Thomas R. Metcalf, Richard C. Canfield, Julia L. R. Saba, Astrophys. J., 365, 391, 1990.

  10. Flare Heating and Ionization of the Low Solar Chromosphere, Thomas Robert Metcalf, Ph.D. Thesis, University of California, San Diego, 1990.

  11. On the Overdetermined Celestial Fix, Thomas R. Metcalf and Frederic T. Metcalf, Navigation, Vol. 38, No. 1, pp. 79-89, 1991.

  12. The Derivation of Vector Magnetic Fields from Stokes Profiles: Derivative versus Least Squares Fitting Techniques, T. R. Metcalf, R. C. Canfield, D. L. Mickey, and B. W. Lites, in Solar Polarimetry, Proceedings of the Eleventh National Solar Observatory Summer Workshop, ed. L. November, National Solar Observatory, Sacramento Peak, 1991.

  13. Advancing Celestial Circles of Position, Thomas R. Metcalf, Navigation, Vol. 38, No. 3, pp. 285-288, 1991.

  14. Search for Evidence of Low Energy Protons in Solar Flares, Thomas R. Metcalf, Jean-Pierre Wülser, Richard C. Canfield, Hugh S. Hudson, in The Compton Observatory Science Workshop, ed. C. R. Shrader, N. Gehrels, and B. Dennis, NASA Conference Publication 3137, pp. 536-541, 1992.

  15. Hard X-ray Imaging Observations by Yohkoh of the 15 November, 1991 Solar Flare, Taro Sakao, Takeo Kosugi, Satoshi Masuda, Mika Inda, Kazuo Makishima, Richard C. Canfield, Hugh S. Hudson, Thomas R. Metcalf, Jean-Pierre Wülser, Loren W. Acton, and Yoshiaki Ogawara, Publ. Astron. Soc. Japan, 1992, 44, L83, 1992.

  16. The X Flare of 1991 November 15: Coordinated Mees/Yohkoh Observations, Richard C. Canfield, Hugh S. Hudson, Kimberly D. Leka, Thomas R. Metcalf, Donald L. Mickey, Jean-Pierre Wülser, Loren W. Acton, Keith T. Strong, Takeo Kosugi, Taro Sakao, Saku Tsuneta, J. Leonard Culhane, Alan Phillips, and Andrejz Fludra, Publ. Astron. Soc. Japan, 44, L111, 1992.

  17. An Extension to the Overdetermined Celestial Fix, Thomas R. Metcalf, Navigation, Vol. 39, No. 4, pp. 477-480, 1993.

  18. The Morphology of Flare Phenomena, Magnetic Fields, and Electric Currents in Active Regions. I. Introduction and Methods, Richard C. Canfield, J.-F. de la Beaujardière, Yuhong Fan, K. D. Leka, A. N. McClymont, Thomas R. Metcalf, Donald L. Mickey, Jean-Pierre Wülser, and Bruce W. Lites, Astrophys. J., 411, 362, 1993.

  19. The 5 January 1992 Flare at 13.3 UT: Observations from Yohkoh, G. A. Doschek, K. T. Strong, R. D. Bentley, C. M. Brown, J. L. Culhane, U. Feldman, A. Fludra, E. Hiei, J. Lang, J. T. Mariska, K. J. H. Phillips, C. D. Pike, A. C. Sterling, T. Watanabe, L. W. Acton, M. E. Bruner, T. Hirayama, S. Tsuneta, E. Rolli, T. Kosugi, M. Yoshimori, H. S. Hudson, T. R. Metcalf, J.-P Wülser, Y. Uchida, and Y. Ogawara, Astrophys. J., 416, 845, 1993.

  20. Morphological Evolution of NOAA 6919, B. Anwar, H. S. Hudson, L. van Driel-Gesztelyi, M. Makita, and T. Metcalf, in Proceedings of the United Nations/Indonesia Regional conference on Space Science and Technology for Sustainable Development, Bandung, 1993.

  21. Diagnostics of Twisted Flux Emergence (NOAA AR7260), K. D. Leka, L. van Driel-Gesztelyi, B. Anwar, R. C. Canfield, H. S. Hudson, T. R. Metcalf, D. L. Mickey, N. Nitta, and H. Kurokawa, in X-Ray Solar Physics from Yohkoh, ed. Y. Uchida, K. Shibata, T. Watanabe, and H. S. Hudson, Univ. Acad. Press, Tokyo, p. 25, 1993.

  22. Electric Currents and Coronal Structures in NOAA Active Region 6952, T. R. Metcalf, R. C. Canfield, H. S. Hudson, D. L. Mickey, J.-P Wülser, and S. Tsuneta, in X-ray Solar Physics from Yohkoh, ed. Y. Uchida, K. Shibata, T. Watanabe, and H. S. Hudson, Univ. Acad. Press, Tokyo, p. 51, 1993.

  23. Flares in Active Region NOAA 7260, N. Nitta, L. Van Driel-Gesztelyi, K. D. Leka, T. Sakurai, K. Shibata, K. Ichimoto, R. C. Canfield, J.-P. Wülser, T. R. Metcalf, and D. L. Mickey, in X-ray Solar Physics from Yohkoh, ed. Y. Uchida, K. Shibata, T. Watanabe, and H. S. Hudson, Univ. Acad. Press, Tokyo, p. 111, 1993.

  24. Morphological Evolution of the Post-Flare Loops of June 25-26, 1992, B. Anwar, E. Hiei, H. S. Hudson, L. W. Acton, T. Metcalf, J. Lemen, and P. Martens, in X-ray Solar Physics from Yohkoh, ed. Y. Uchida, K. Shibata, T. Watanabe, and H. S. Hudson, Univ. Acad. Press, Tokyo, p. 121, 1993.

  25. The X Flare of 15 November 1991: Preflare Flux Emergence, Heating and Filament Eruption, R. C. Canfield, K. A. Blais, A. N. McClymont, T. R. Metcalf, K. P. Reardon, J.-P. Wülser, L. W. Acton, H. Kurokawa, and T. Hirayama, in X-ray Solar Physics from Yohkoh, ed. Y. Uchida, K. Shibata, T. Watanabe, and H. S. Hudson, Univ. Acad. Press, Tokyo, p. 153, 1993.

  26. A Search for Low Energy Protons in a Solar Flare from October, 1992: Preliminary Results, T. Metcalf, D. Mickey, R. Canfield, and J.-P. Wülser, in High-Energy Solar Phenomena - A New Era of Spacecraft Measurements, ed. J. M. Ryan and W. T. Vestrand, American Institute of Physics, New York, 1994.

  27. Radio Imaging Observations of the Evolution of Thermal and Nonthermal Sources during a Gradual Burst, M. Nishio, H. Nakajima, S. Enome, K. Shibasaki, T. Takano, Y. Hanaoka, C. Torii, H. Sekiguchi, T. Bushimata, S. Kawashima, N. Shinohara, Y. Irimajiri, Y. Choi, H. Koshiishi, Y. Shiomi, T. Metcalf, and R. Canfield, Publ. Astron. Soc. Japan, 46, L11, 1994.

  28. Patterns of Helicity in Solar Active Regions, A. A. Pevtsov, Richard C. Canfield, and Thomas R. Metcalf, Astrophys. J., 425, L117, 1994.

  29. Electric Currents and Coronal Heating in NOAA Active Region 6952, T. R. Metcalf, R. C. Canfield, H. S. Hudson, D. L. Mickey, J.-P. Wülser, P. C. H. Martens, and S. Tsuneta, Astrophys. J., 428, 860, 1994.

  30. The 'Fixed' Stars, Thomas R. Metcalf, Ocean Navigator, No. 62, pp. 21-25, 1994.

  31. Electron Precipitation and Mass Motion in the 1991 June 9 White Light Flare, J.-F. De La Beaujardière, R. C. Canfield, T. R. Metcalf, E. Hiei, T. Sakurai, and K. Ichimoto, Solar Phys., 151, 389, 1994.

  32. Temperature Analysis of the Post-Flare Loops of June 25-26, 1992, B. Anwar, E. Hiei, H. S. Hudson, L. W. Acton, J. Lemen, and T. R. Metcalf, In Proceedings of Kofu Symposium, New Look at the Sun, NRO Report No. 360, NAOJ, Nagano, 1994, pp. 137-140.

  33. Flares in Active Region NOAA 7260 - Role of Emerging Flux, N. Nitta, L. Van Driel-Gesztelyi, K. D. Leka, D. L. Mickey, T. R. Metcalf, J.-P. Wülser, K. Ichimoto, T. Sakurai, K. Shibata, In Proceedings of Kofu Symposium, New Look at the Sun, NRO Report No. 360, NAOJ, Nagano, 1994, pp. 385-388.

  34. Piloting with Celestial Algorithms, Thomas R. Metcalf and Frederic T. Metcalf, Navigation, Vol. 41, No. 2, pp. 207-214, 1994.

  35. Dynamics of a Low Energetic Solar Flare, J. G. Doyle, A. Fludra, R. D. Bentley, J. L. Culhane, T. Metcalf, J. R. Lemen, T. Kosugi, In Cool Stars, Stellar Systems, and the Sun, Eighth Cambridge Workshop, ed. J.-P. Caillault, ASP Conference Series, Vol. 64, 1994.

  36. Resolving the 180 Degree Ambiguity in Vector Magnetic Field Measurements: The 'Minimum' Energy Solution, Thomas R. Metcalf, Solar Phys., 155, 235, 1994.

  37. Circle Games, Coastal Navigation, Thomas R. Metcalf, Cruising World, Jan. 1995, pp. 57-63.

  38. Is the Solar Chromospheric Magnetic Field Force-Free?, Thomas R. Metcalf, Litao Jiao, Han Uitenbroek, Alexander N. McClymont, and Richard C. Canfield, Astrophys. J., 439, 474, 1995.

  39. Latitudinal Variation of Helicity of Photospheric Magnetic Fields, Alexei A. Pevtsov, Richard C. Canfield, and Thomas R. Metcalf, Astrophys. J. Lett., 440, L109, 1995.

  40. Evolution of Two Small Solar Flares, A. Fludra, J. G. Doyle, T. Metcalf, J. R. Lemen, K. J. H. Phillips, J. L. Culhane, and T. Kosugi, Astron. and Astrophys., 303, 914, 1995.

  41. A Test of a New Flare Loop Scaling Law Using Yohkoh SXT and GOES Observations, Thomas R. Metcalf and George H. Fisher, Astrophys. J., 462, 977, 1996.

  42. Pixon-Based Multiresolution Image Reconstruction for Yohkoh's Hard X-Ray Telescope, Thomas R. Metcalf, Hugh S. Hudson, Takeo Kosugi, R. C. Puetter, and R. K. Piña, Astrophys J., 466, 585, 1996.

  43. Pixon-Based Multiresolution Image Reconstruction for Yohkoh's Hard X-Ray Telescope, Thomas R. Metcalf, Hugh S. Hudson, Takeo Kosugi, R. C. Puetter, and R. K. Piña, in Maximum Entropy and Bayesian Methods, ed. K. M. Hansen and R. N. Silver, Kluwer Academic Publishers, pp. 361-365, 1996.

  44. Pixon Reconstruction and the Masuda Event of 13 Jan 1992, D. Alexander, T. Metcalf, and H. Hudson, Proceedings of Bath Meeting, 1996.

  45. What is the Spatial Relationship between Hard X-Ray Footpoints and Vertical Electric Currents in Solar Flares?, Jing Li, Thomas R. Metcalf, Richard C. Canfield, Jean-Pierre Wülser, and Takeo Kosugi, Astrophys. J., 482, 490, 1997.

  46. Evolution of a Delta-Group in the Photosphere and Corona, L. Van Driel-Gesztelyi, G. Csepura, B. Schmieder, J.-M. Malherbe, and T. Metcalf, Solar Phys., 172, 151, 1997.

  47. A Spectral Analysis of the Masuda Flare Using HXT Pixon Reconstruction, David Alexander and Thomas R. Metcalf, Astrophys. J., 489, 442, 1997.

  48. Using the World Wide Web to Make Yohkoh SXT Images Available to the Public: The Yohkoh Public Outreach Project, D. McKenzie, M. B. Larson, T. Slater, L. Acton, D. Alexander, S. Freeland, J. Lemen, T. Metcalf, Proceedings of the Fifth SOHO Workshop, 'The Corona and the Solar Wind near Minimum Activity', Oslo, Norway, ESA SP-404, September 1997, pp. 561-565.

  49. Coronal Heating in Active Regions as a Function of Global Magnetic Variables, George H. Fisher, Dana W. Longcope, Thomas R. Metcalf, and Alexei A. Pevtsov, Astrophys. J., 508, 885, 1998.

  50. Coronal Trapping of Energetic Flare Particles: Yohkoh/HXT Observations, Thomas R. Metcalf and David Alexander, Astrophys. J., 522, 1108, 1999.

  51. Anticipating HESSI's Spatially Resolved View of Spectral Evolution, E. Newton, T. Giblin, and T. Metcalf, in High Energy Solar Physics: Anticipating HESSI, ASP Conference Series, Vol. 206, pp. 272-275, eds. R. Ramaty & N. Mandzhavidze, 2000.

  52. Coronal Trapping of Energetic Flare Particles: Yohkoh/HXT Observations, Thomas R. Metcalf and David Alexander, in High Energy Solar Physics: Anticipating HESSI, ASP Conference Series, Vol. 206, pp. 233-238, eds. R. Ramaty & N. Mandzhavidze, 2000.

  53. The New Yohkoh Science Movie, L. Acton, A. Davey, S. Freeland, J. Lemen, T. Metcalf, in YOHKOH 8TH ANNIVERSARY SYMPOSIUM, Explosive Phenomena in Solar and Space Plasmas, in press, 2000.

  54. Evidence for the Flare Trigger Site and Three-Dimensional Reconnection in Multiwavelength Observations of a Solar Flare, L. Fletcher, T. R. Metcalf, D. Alexander, D. S. Brown, and L. A. Ryder, Astrophys J., 554, 451, 2001.

  55. Fast Acceleration of a CME-Related X-ray Structure in the Low Solar Corona, David. Alexander, Thomas. R. Metcalf and Nariaki. V. Nitta, Geophys. Res. Lett., Vol. 29, No. 10., 10.1029/2001GL013670, 2001. .

  56. The Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI), R.P. Lin and 66 co-authors including T. Metcalf, Solar Phys., 210, 3, 2002.

  57. The RHESSI Imaging Concept, G. J. Hurford, E. J. Schmahl, R. A. Schwartz, A. J. Conway, M. J. Aschwanden, A. Csillaghy, B. R. Dennis, C. Johns-Krull, S. Krucker, R. P. Lin, J. McTiernan, T. R. Metcalf, J. Sato, D. M. Smith, Solar Phys., 210, 61, 2002.

  58. Energy dependence of Electron Trapping in a Solar Flare, David Alexander and Thomas R. Metcalf, Solar Phys., 210, 323, 2002.

  59. Observations of Rotating Sunspots and Their Effect in the Corona, D.S. Brown, R.W., Nighingale, D. Alexander, C.J. Schrijver, T.R. Metcalf, R.A. Shine, A.M. Title, and C.J. Wolfson, Proceedings of the Magnetic Coupling of the Solar Atmosphere Euroconference and IAU Colloquium 188, 11 - 15 June 2002, Santorini, Greece., ed. H. Sawaya-Lacoste, pp. 261-264, 2002.

  60. Yohkoh: A Decade of Discovery, D. Alexander and T. R. Metcalf, in Multi-Wavelength Observations of Coronal Structure and Dynamics, ed. P.C.H. Martens and D. P. Cauffman, COSPAR Colloquia Series, Vol. 13, pp. 103-112, 2002.

  61. The Yohkoh Public Outreach Project, M. B. Larson, T. Slater, D. McKenzie, L. Acton, D. Alexander, J. Lemen, S. Freeland, and T. Metcalf, in Multi-Wavelength Observations of Coronal Structure and Dynamics, ed. P.C.H. Martens and D. P. Cauffman, COSPAR Colloquia Series, Vol. 13, pp. 117-118, 2002.

  62. Concurrent Rotating Sunspots, Twisted Coronal Fans, Sigmoidal Structures, and Coronal Mass Ejections, R. W. Nightengale, D. S. Brown, T. R. Metcalf, C. J. Schrijver, R. A. Shine, A. M. Title, and C. J. Wolfson, in Multi-Wavelength Observations of Coronal Structure and Dynamics, ed. P.C.H. Martens and D. P. Cauffman, COSPAR Colloquia Series, Vol. 13, pp. 149-150, 2002.

  63. The Magnetic Free Energy and a CME in Active Region 8299, T. R. Metcalf, D. L. Mickey, B. J. LaBonte, and L. A. Ryder, in Multi-Wavelength Observations of Coronal Structure and Dynamics, ed. P.C.H. Martens and D. P. Cauffman, COSPAR Colloquia Series, Vol. 13, pp. 249-252, 2002.

  64. Active Region Magnetic Structure Observed in the Photosphere and Chromosphere, K. D. Leka and Thomas R. Metcalf, Solar Phys., 212, 361, 2003.

  65. TRACE and YOHKOH Observations of a White Light Flare, Thomas R. Metcalf, David Alexander, Hugh S. Hudson, Dana W. Longcope, Astrophys. J., 595, 483, 2003.

  66. Observations of Rotating Sunspots from TRACE, D. S. Brown, R. W. Nightingale, D. Alexander, C. J. Schrijver, T. R. Metcalf, R. A. Shine, A. M. Title, C. J. Wolfson, Solar Phys., 216, 79, 2003.

  67. The Relationship Between X-ray Radiance and Magnetic Flux, Alexei A. Pevtsov, George H. Fisher, Loren W. Acton, Dana W. Longcope, Christopher M. Johns-Krull, Charles C. Kankelborg, and Thomas R. metcalf, ApJ, 598, 1387, 2003.

  68. On the Resolution of the Azimuthal Ambiguity in Vector Magnetograms of Solar Active Regions, Manolis K. Georgoulis, Barry J. LaBonte, and Thomas R. Metcalf, ApJ, 602, 446, 2004.

  69. On the Photometric Accuracy of RHESSI Imaging and Spectroscopy, M. J. Aschwanden, T. R. Metcalf, S. Krucker, J. Sato, A. Conway, G. J. Hurford, and Schmahl, E., Solar Phys., 219, 149, 2004.

  70. Energy Partition in Two Solar Flare/CME Events, A. G. Emslie, H. Kucharek, B. R. Dennis, N. Gopalswamy, G. D. Holman, G. H. Share, A. Vourlidas, T. G. Forbes, P. T. Gallagher, G. M. Mason, T. R. Metcalf, R. A. Mewaldt, R. J. Murphy, R. A. Schwartz, and T. H. Zurbuchen, J. Geophys. Res., 109, A10104, 2004.

  71. Magnetic Free Energy in AR10486 on October 29, 2003, Thomas R. Metcalf, K. D. Leka, and D. L. Mickey, ApJL, 623, L53, 2005.

  72. An Improved Virial Estimate of Solar Active Region Energy, M. S. Wheatland and Thomas R. Metcalf, ApJ, 636, 1151, 2006.

  73. White-Light Flares: A TRACE/RHESSI Overview, H. S. Hudson, C. J. Wolfson, T. R. Metcalf, Solar Phys., 234, 79, 2006.

  74. Non-linear force-free modeling of coronal magnetic fields. I. A quantitative comparison of methods, Carolus J. Schrijver, Marc L. DeRosa, Thomas R. Metcalf, Yang Liu, Jim McTiernan, Stephane Regnier, Gherardo Valori, Michael S. Wheatland, Thomas Wiegelmann, Solar Physics, 235, 161, 2006.

  75. An Overview of Existing Algorithms for Resolving the 180 Degree Ambiguity in Vector Magnetic Fields: Quantitative Tests with Synthetic Data, Thomas R. Metcalf, K. D. Leka, Graham Barnes, Bruce W. Lites, Manolis K. Georgoulis, A. A. Pevtsov, G. Allen Gary, Ju Jing, K. S. Balasubramaniam, Jing Li, Y. Liu, H. N. Wang, Valentyna Abramenko, Vasyl Yurchyshyn, Y.-J. Moon, Solar Physics, 237, 267, 2006.

  76. A TRACE White Light and RHESSI Hard X-Ray Study of Flare Energetics, L. Fletcher, I. G. Hannah, H. S. Hudson, and T. R. Metcalf, ApJ, 656, 1187, 2007.

  77. Non-Linear Force-Free Modeling of Coronal Magnetic Fields. II. Modeling a Filament Arcade from Simulate Chromospheric and Photospheric Vector Fields, Thomas R. Metcalf, Marc L. DeRosa, Carolus J. Schrijver, Graham Barnes, Adriaan A. van Ballegooijen, Thomas Wiegelmann, Michael S. Wheatland, Gherardo Valori, and James M. McTiernan, Solar Physics, submitted, 2007.