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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 1:55 |
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Conference: Bucharest University Faculty of Physics 2024 Meeting
Section: Atomic and Molecular Physics. Astrophysics. Applications. Optics, Spectroscopy, Plasma and Lasers
Title:
Evolution of photospheric fields during the production of explosive events
Authors:
Liliana DUMITRU, Octavian BLAGOI, Cristian DANESCU
Affiliation:
Astronomical Institute of the Romanian Academy
E-mail
Liliana.Dumitru@astro.ro
Keywords:
Active region, solar flares, velocity fields, coronal magnetic field, magnetic flux.
Abstract:
We analyzed a solar active region that produced several strong solar flares in the ascending phase of solar cycle 25. We used Spaceweather HMI Active Region Patch (SHARP) vector magnetograms from the Helioseismic and Magnetic Imager (HMI) on board the Solar Dynamics Observatory (SDO). Our attention is focused on the evolution of photospheric flows during the production of explosive events. We determined the velocity fields using different algorithms to compare them before and after an eruption. Also, we extrapolated the coronal magnetic field from the photospheric magnetograms and calculated the unsigned magnetic flux highlighting its variations before, during and after the occurrence of a solar flare.
References:
Bobra, M. G., Sun, X., Hoeksema, J. T., et al. 2014, SoPh, 289, 3549
Dumitru L., 2021, Astronomische Nachrichten, 342 (3), 485-496
Valori, G., 13–19 April 2016, SOLARNET (Summer School on Solar MHD and Reconnection), MSSL.
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