Recent Publications

• A Comparison of Flare Forecasting Methods. III. Systematic Behaviors of Operational Solar Flare Forecasting Systems, K.D. Leka, S.H. Park, K. Kusano, J. Andries, G. Barnes, S. Bingham, D.S. Bloomfield, A.E. McCloskey, V. Delouille, D. Falconer, P.T. Gallagher, M.K. Georgoulis, Y. Kubo, K. Lee, S. Lee, V. Lobzin, J. Mun, S.A. Murray, T.A.M. Hamad Nageem, R. Qahwaji, M. Sharpe, R.A. Steenburgh, G. Steward, and M. Terkildsen, ApJ, 881, 101
• A Comparison of Flare Forecasting Methods. II. Benchmarks, Metrics, and Performance Results for Operational Solar Flare Forecasting Systems, K.D. Leka, S.H. Park, K. Kusano, J. Andries, G. Barnes, S. Bingham, D.S. Bloomfield, A.E. McCloskey, V. Delouille, D. Falconer, P.T. Gallagher, M.K. Georgoulis, Y. Kubo, K. Lee, S. Lee, V. Lobzin, J. Mun, S.A. Murray, T.A.M. Hamad Nageem, R. Qahwaji, M. Sharpe, R.A. Steenburgh, G. Steward, and M. Terkildsen, ApJS, 243, 36

• Does Nearby Open Flux Affect the Eruptivity of Solar Active Regions?, M.L. DeRosa and G. Barnes, ApJ, 861, 131
• Inferring Currents from the Zeeman Effect at the Solar Surface, G. Barnes and K.D. Leka, in Electric Currents in Geospace and Beyond (eds A. Keiling, O. Marghitu, and M. Wheatland), John Wiley & Sons, Inc, Hoboken, N.J., p. 81
• The NWRA Classification Infrastructure: description and extension to the Discriminant Analysis Flare Forecasting System (DAFFS), K.D. Leka, G. Barnes, and E.L. Wagner, J. Space Weather Space Clim., 8, A25

• A Comparison of Classifiers for Solar Energetic Events, G. Barnes, N. Schanche, K.D. Leka, A. Aggarwal, and K. Reeves, in Proceedings IAU Symposium No. 325, Astroinformatics, 201
• Evaluating (and Improving) Estimates of the Solar Radial Magnetic Field Component from Line-of-Sight Magnetograms, K.D. Leka, G. Barnes, and E.L. Wagner, Sol. Phys., 292, 36

• A Fixed-point Scheme for the Numerical Construction of Magnetohydrostatic Atmospheres in Three Dimensions, S.A. Gilchrist, D.C. Braun, and G. Barnes, Sol. Phys., 291, 3583
• A Comparison of Flare Forecasting Methods, I: Results from the "All-Clear" Workshop, G. Barnes, K.D. Leka, C.J. Schrijver, T. Colak, R. Qahwaji, O.W. Ashamari, Y. Yuan, J. Zhang, R.T.J. McAteer, D.S. Bloomfield, P.A. Higgins, P.T. Gallagher, D.A. Falconer, M.K. Georgoulis, M.S. Wheatland, C. Balch, T. Dunn and E.L. Wagner ApJ, 829, 89
• Achieving Consistent Doppler Measurements from SDO/HMI Vector Field Inversions, P.W. Schuck, S.K. Antiochos, K.D. Leka, and G. Barnes, ApJ, 823, 101

• The Influence of Spatial Resolution on Nonlinear Force-Free Modeling, M.L. DeRosa, M.S. Wheatland, K.D. Leka, G. Barnes, T. Amari, A. Canou, S.A. Gilchrist, J.K. Thalmann, G. Valori, T. Wiegelmann, C.J. Schrijver, A. Malanushenko, X. Sun, and S. Régnier, ApJ, 811, 107

• The Helioseismic and Magnetic Imager (HMI) Vector Magnetic Field Pipeline: Overview and Performance, J.T. Hoeksema, Y. Liu, K. Hayashi, X. Sun, J. Schou, S. Couvidat, A. Norton, M. Bobra, R. Centeno, K.D. Leka, G. Barnes, and M. Turmon, Sol. Phys., 289, 3483
• The Helioseismic and Magnetic Imager (HMI) Vector Magnetic Field Pipeline: Optimization of the Spectral Line Inversion Code, R. Centeno, J. Schou, K. Hayashi, A. Norton, J.T. Hoeksema, Y. Liu, K.D. Leka, and G. Barnes, Sol. Phys., 289, 3531
• The Helioseismic and Magnetic Imager (HMI) Vector Magnetic Field Pipeline: SHARPs -- Space-Weather HMI Active Region Patches, M. Bobra, X. Sun, J.T. Hoeksema, M. Turmon, Y. Liu, K. Hayashi, G. Barnes, and K.D. Leka, Sol. Phys., 289, 3549
• Helioseismology of Pre-emerging Active Regions. III. Statistical Analysis, G. Barnes, A.C. Birch, K.D. Leka, and D.C. Braun, ApJ, 786, 19

• Helioseismology of Pre-emerging Active Regions. II. Average Emergence Properties, A.C. Birch, D.C. Braun, K.D. Leka, G. Barnes, and B. Javornik, ApJ, 762, 131
• Helioseismology of Pre-emerging Active Regions. I. Overview, Data, and Target Selection Criteria, K.D. Leka, G. Barnes, A.C. Birch, I. Gonzalez-Hernandez, T. Dunn, B. Javornik, and D.C. Braun, ApJ, 762, 130

• Modelling and Interpreting The Effects of Spatial Resolution on Solar Magnetic Field Maps, K.D. Leka and G. Barnes, Sol. Phys., 277, 89
• Response to `A Comment on "Resolving the 180 Degree Ambiguity in Solar Vector Magnetic Field Data: Evaluating the Effects of Noise, Spatial Resolution, and Method Assumptions"', K.D. Leka, G. Barnes, G.A. Gary, A.D. Crouch, and Y. Liu, Sol. Phys., 276, 441

• Subsurface Vorticity of Flaring versus Flare-Quiet Active Regions, R. Komm, R. Ferguson, F. Hill, G. Barnes and K.D. Leka, Sol. Phys., 268, 389

• The Role of Magnetic Topology in the Heating of Active Region Coronal Loops, J.-Y. Lee, G. Barnes, K.D. Leka, K.K. Reeves, K.E. Korreck, L. Golub, and E.E. DeLuca, ApJ, 723, 1493

• Resolving the Azimuthal Ambiguity in Vector Magnetogram Data with the Divergence-Free Condition: Application to Discrete Data, A.D. Crouch, G. Barnes and K.D. Leka, Sol. Phys., 260, 271-287
• Resolving the 180 Degree Ambiguity in Solar Vector Magnetic Field Data: Evaluating the Effects of Noise, Spatial Resolution, and Method Assumptions, K.D. Leka, G. Barnes, A.D. Crouch, T.R. Metcalf, G.A. Gary, J. Jing and Y. Liu, Sol. Phys., 260, 83-108
• A Critical Assessment of NonLinear Force-Free Field Modeling of the Solar Corona for a Recent Solar Active Region, M.L. DeRosa, C.J. Schrijver, G. Barnes, K.D. Leka, B.W. Lites, M.J. Aschwanden, T. Amari, A. Canou, J.M. McTiernan, S. Régnier, J.K. Thalmann, G. Valori, M.S. Wheatland, T. Wiegelmann, M.C.M. Cheung, P.A. Conlon, M. Fuhrmann, B. Inhester and T. Tadesse, ApJ, 696, 1780-1791
• Effects of Partitioning and Extrapolation on the Connectivity of Potential Magnetic Fields, D.W. Longcope, G. Barnes and C. Beveridge, ApJ, 693, 97-111

• Evaluating the Performance of Solar Flare Forecasting Methods, G. Barnes and K.D. Leka, ApJL, 688, L107-L110
• Non-Linear Force-Free Modeling of a Solar Active Region Around the Time of a Major Flare and Coronal Mass Ejection, C.J. Schrijver, M.L. DeRosa, T.R. Metcalf, G. Barnes, B. Lites, T. Tarbell, J. McTiernan, G. Valori, T. Wiegelmann, M.S. Wheatland, T. Amari, G. Aulanier, P. Démoulin, M. Fuhrmann, K. Kusano, S. Régnier and J.K. Thalmann, ApJ, 675, 1637-1644
• Non-Linear Force-Free Modeling of Coronal Magnetic Fields. II. Modeling a Filament Arcade from Simulated Chromospheric and Photospheric Vector Fields, T.R. Metcalf, M.L. DeRosa, C.J. Schrijver, G. Barnes, A.A. van Ballegooijen, T. Wiegelmann, M.S. Wheatland, G. Valori and J.M. McTiernan, Sol. Phys., 247, 269-299
• Resolving the Azimuthal Ambiguity in Vector Magnetogram Data with the Divergence-Free Condition: Theoretical Examination, A.D. Crouch and G. Barnes, Sol. Phys., 427, 25-37

• Modeling and Measuring the Flux Reconnected and Ejected by the Two-Ribbon Flare/CME Event on 7 November 2004, Dana Longcope, Colin Beveridge, Jiong Qiu, B. Ravindra, Graham Barnes and Sergio Dasso, Sol. Phys., 244, 45-73
• On The Relationship Between Coronal Magnetic Null Points and Solar Eruptive Events, G. Barnes, ApJL, 670, 53-56
• Determining the Source of Coronal Helicity Through Measurements of Braiding and Spin Helicity Fluxes in Active Regions, D.W. Longcope, B. Ravindra and G. Barnes, ApJ, 668, 571-585
• Probabilistic Forecasting of Solar Flares from Vector Magnetogram Data, G. Barnes, K.D. Leka, E.A. Schumer and D.J. Della-Rose, Space Weather J., 5, S09002
• Photospheric Magnetic Field Properties of Flaring Versus Flare-Quiet Active Regions. IV. A Statistically Significant Sample, K.D. Leka and G. Barnes, ApJ, 656, 1173-1186

• Photospheric Magnetic Field Properties of Flaring Versus Flare-Quiet Active Regions. III. Magnetic Charge Topology Models, G. Barnes and K.D. Leka, ApJ, 646, 1303-1318
• Quantifying the Performance of Force-Free Extrapolation Methods Using Known Solutions, G. Barnes, K.D. Leka and M.S. Wheatland, ApJ, 641, 1188-1196
• An Overview of Existing Algorithms for Resolving the 180 Degree Ambiguity in Vector Magnetic Fields: Quantitative Tests with Synthetic Data, T.R. Metcalf, K.D. Leka, G. Barnes, B.W. Lites, M.K. Georgoulis, A.A. Pevtsov, G.A. Gary, J. Jing, K.S. Balasubramaniam, J. Li, Y. Liu, H.N. Wang, V. Abramenko, V. Yurchyshyn, and Y.-J. Moon, Sol. Phys., 237, 267-296

• Implementing a Magnetic Charge Topology Model for Solar Active Regions, G. Barnes, D.W. Longcope and K.D. Leka, ApJ, 629, 561-571
• On the Availability of Sufficient Twist in Solar Active Regions to Trigger the Kink Instability, K.D. Leka, Y. Fan and G. Barnes, ApJ, 626, 1091-1095