UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS

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Conference: Bucharest University Faculty of Physics 2022 Meeting


Section: Atomic and Molecular Physics. Astrophysics. Applications


Title:
Study of the first productive active region from the ascending phase of the solar cycle 25


Authors:
Liliana DUMITRU, Cristian DANESCU, Octavian BLAGOI


Affiliation:
Astronomical Institute of the Romanian Academy


E-mail
lyly@aira.astro.ro


Keywords:
active region, solar cycle, solar flare, force-free field


Abstract:
We studied the evolution of the active region (AR) 12975 since it was the first productive active region from the ascending phase of the solar cycle 25. The active region was observed between March 24 and April 4, 2022. During this period 80 solar flares (67 C-class, 12 M-class and one X-class) were detected. Following the M4.0 class solar flare on March 28 (with max at 11:28 UTC), a radio burst type II and an Earth direction Coronal Mass Ejection (CME) followed. The type II radio burst was detected by the CALLISTO radio spectrometer installed at Solar Observatory from Astronomical Institute of the Romanian Academy, a custom device for this kind of radio observations, developed by Christian Monstein (IRSOL, Switzerland). Using an nonlinear force-free field (NLFFF) method, we calculated the unsigned magnetic flux and extrapolated the configuration of the 3D coronal magnetic field using the Helioseismic and Magnetic Imager (HMI) onboard the Solar Dynamic Observatory (SDO).


References:

Pesnell,W. D., Thompson, B. J., & Chamberlin, P. C. 2012, Sol. Phys., 275, 3.

Scherrer, P. H., Schou, J., Bush, R. I., et al. 2012, Sol. Phys., 275, 207.

Schou, J., Scherrer, P. H., Bush, R. I., et al. 2012, Sol. Phys., 275, 229.



Acknowledgement:
The authors thank for custom software used to extract the relevant signal from the background noise, provided by Christian Monstein (IRSOL, Switzerland). We thank the Solar Dynamics Observatory (SDO) team for providing the data for study and particularly to the HMI instrument.