Search Results - "Thalmann, J. K."

Magnetic Helicity Estimations in Models and Observations of the Solar Magnetic Field. IV. Application to Solar Observations by Thalmann, J. K., Georgoulis, M. K., Liu, Y., Pariat, E., Valori, G., Anfinogentov, S., Chen, F., Guo, Y., Moraitis, K., Yang, S., Mastrano, Alpha

“…Abstract In this ISSI-supported series of studies on magnetic helicity in the Sun, we systematically implement different magnetic helicity calculation methods…”
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How Should One Optimize Nonlinear Force-Free Coronal Magnetic Field Extrapolations from SDO/HMI Vector Magnetograms? by Wiegelmann, T., Thalmann, J. K., Inhester, B., Tadesse, T., Sun, X., Hoeksema, J. T.

“…The Helioseismic and Magnetic Imager (HMI) on board the Solar Dynamics Observatory (SDO) provides photospheric vector magnetograms with a high spatial and…”
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Statistical Properties of Ribbon Evolution and Reconnection Electric Fields in Eruptive and Confined Flares by Hinterreiter, J., Veronig, A. M., Thalmann, J. K., Tschernitz, J., Pötzi, W.

“…A statistical study of the chromospheric ribbon evolution in H α two-ribbon flares was performed. The data set consists of 50 confined (62%) and eruptive (38%)…”
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FORCE-FREE FIELD MODELING OF TWIST AND BRAIDING-INDUCED MAGNETIC ENERGY IN AN ACTIVE-REGION CORONA by Thalmann, J K, Tiwari, S K, Wiegelmann, T

“…The theoretical concept that braided magnetic field lines in the solar corona may dissipate a sufficient amount of energy to account for the brightening…”
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Nonlinear Force-free Field Modeling of a Solar Active Region around the Time of a Major Flare and Coronal Mass Ejection by Schrijver, C. J, DeRosa, M. L, Metcalf, T, Barnes, G, Lites, B, Tarbell, T, McTiernan, J, Valori, G, Wiegelmann, T, Wheatland, M. S, Amari, T, Aulanier, G, Démoulin, P, Fuhrmann, M, Kusano, K, Régnier, S, Thalmann, J. K

“…Solar flares and coronal mass ejections are associated with rapid changes in field connectivity and are powered by the partial dissipation of electrical…”
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TEMPORAL AND SPATIAL RELATIONSHIP OF FLARE SIGNATURES AND THE FORCE-FREE CORONAL MAGNETIC FIELD by Thalmann, J. K., Veronig, A., Su, Y.

“…ABSTRACT We investigate the plasma and magnetic environment of active region NOAA 11261 on 2011 August 2 around a GOES M1.4 flare/CME (SOL2011-08-02T06:19). We…”
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Estimating the Relative Helicity of Coronal Magnetic Fields by Thalmann, J. K., Inhester, B., Wiegelmann, T.

“…To quantify changes of the solar coronal field connectivity during eruptive events, one can use magnetic helicity, which is a measure of the shear or twist of…”
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Can We Improve the Preprocessing of Photospheric Vector Magnetograms by the Inclusion of Chromospheric Observations? by Wiegelmann, T., Thalmann, J. K., Schrijver, C. J., DeRosa, M. L., Metcalf, T. R.

“…The solar magnetic field is key to understanding the physical processes in the solar atmosphere. Nonlinear force-free codes have been shown to be useful in…”
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Probing the solar coronal magnetic field with physics-informed neural networks by Jarolim, R., Thalmann, J. K., Veronig, A. M., Podladchikova, T.

“…While the photospheric magnetic field of our Sun is routinely measured, its extent into the upper atmosphere is typically not accessible by direct…”
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Magnetic Helicity Evolution and Eruptive Activity in NOAA Active Region 11158 by Green, L. M., Thalmann, J. K., Valori, G., Pariat, E., Linan, L., Moraitis, K.

“…Abstract Coronal mass ejections are among the Sun’s most energetic activity events yet the physical mechanisms that lead to their occurrence are not yet fully…”
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Magnetic Helicity Estimations in Models and Observations of the Solar Magnetic Field. III. Twist Number Method by Guo, Y., Pariat, E., Valori, G., Anfinogentov, S., Chen, F., Georgoulis, M. K., Liu, Y., Moraitis, K., Thalmann, J. K., Yang, S.

“…We study the writhe, twist, and magnetic helicity of different magnetic flux ropes, based on models of the solar coronal magnetic field structure. These…”
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THE INFLUENCE OF SPATIAL RESOLUTION ON NONLINEAR FORCE-FREE MODELING by DeRosa, M. L., Wheatland, M. S., Leka, K. D., Barnes, G., Amari, T., Canou, A., Gilchrist, S. A., Thalmann, J. K., Valori, G., Wiegelmann, T., Schrijver, C. J., Malanushenko, A., Sun, X., Régnier, S.

“…ABSTRACT The nonlinear force-free field (NLFFF) model is often used to describe the solar coronal magnetic field, however a series of earlier studies revealed…”
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The Causes of Quasi-homologous CMEs by Liu, Lijuan, Wang, Yuming, Liu, Rui, Zhou, Zhenjun, Temmer, M., Thalmann, J. K., Liu, Jiajia, Liu, Kai, Shen, Chenglong, Zhang, Quanhao, Veronig, A. M.

“…In this paper, we identified the magnetic source locations of 142 quasi-homologous (QH) coronal mass ejections (CMEs), of which 121 are from solar cycle (SC)…”
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ARCADE IMPLOSION CAUSED BY A FILAMENT ERUPTION IN A FLARE by Wang, Juntao, Simões, P. J. A., Fletcher, L., Thalmann, J. K., Hudson, H. S., Hannah, I. G.

“…ABSTRACT Coronal implosions-the convergence motion of plasmas and entrained magnetic field in the corona due to a reduction in magnetic pressure-can help to…”
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COMPARISON OF FORCE-FREE CORONAL MAGNETIC FIELD MODELING USING VECTOR FIELDS FROM HINODE AND SOLAR DYNAMICS OBSERVATORY by Thalmann, J K, Tiwari, S K, Wiegelmann, T

“…Photospheric magnetic vector maps from two different instruments are used to model the nonlinear force-free coronal magnetic field above an active region. We…”
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Stability of the coronal magnetic field around large confined and eruptive solar flares by Gupta, Manu, Thalmann, J. K, Veronig, A. M

“…A&A 686, A115 (2024) In order to improve our understanding on the pre-requisites of eruptive solar flares, we study and compare different measures that…”
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The effect of spatial sampling on magnetic field modeling and helicity computation by Thalmann, J. K, Gupta, Manu, Veronig, A. M

“…A&A 662, A3 (2022) Nonlinear force-free (NLFF) modeling is regularly used in order to indirectly infer the 3D geometry of the coronal magnetic field, not…”
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Magnetic helicity and energy budget around large confined and eruptive solar flares by Gupta, Manu, Thalmann, J. K, Veronig, A. M

“…A&A 653, A69 (2021) We investigate the coronal magnetic energy and helicity budgets of ten solar ARs, around the times of large flares. In particular, we are…”
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Tracking magnetic flux and helicity from Sun to Earth -- Multi-spacecraft analysis of a magnetic cloud and its solar source by Thalmann, J. K, Dumbovic, M, Dissauer, K, Podladchikova, T, Chikunova, G, Temmer, M, Dickson, E, Veronig, A. M

“…A&A 669, A72 (2023) We analyze the complete chain of effects caused by a solar eruptive event in order to better understand the dynamic evolution of…”
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Magnetic helicity budget of solar active regions prolific of eruptive and confined flares by Thalmann, J. K, Moraitis, K, Linan, L, Pariat, E, Valori, G, Dalmasse, K

“…We compare the coronal magnetic energy and helicity of two solar active regions (ARs), prolific in major eruptive (AR~11158) and confined (AR~12192) flaring,…”
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