Some Features of the Variation of the Magnetic Field Characteristics in the Umbra of Sunspots During Flares and Coronal Mass Ejections
- Authors: Zagainova Y.S.1, Fainshtein V.G.2, Rudenko G.V.2, Obridko V.N.1
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Affiliations:
- Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation
- Institute of Solar–Terrestrial Physics
- Issue: Vol 57, No 7 (2017)
- Pages: 835-840
- Section: Article
- URL: https://journals.rcsi.science/0016-7932/article/view/156489
- DOI: https://doi.org/10.1134/S0016793217070258
- ID: 156489
Cite item
Abstract
The observed variations of the magnetic properties of sunspots during eruptive events (solar flares and coronal mass ejections (CMEs)) are discussed. Variations of the magnetic field characteristics in the umbra of the sunspots of active regions (ARs) recorded during eruptive events on August 2, 2011, March 9, 2012, April 11, 2013, January 7, 2014, and June 18, 2015, are studied. The behavior of the maximum of the total field strength Bmax, the minimum inclination angle of the field lines to the radial direction from the center of the Sun αmin (i.e., the inclination angle of the axis of the magnetic tube from the sunspot umbra), and values of these parameters Bmean and αmean mean within the umbra are analyzed. The main results of our investigation are discussed by the example of the event on August 2, 2011, but, in general, the observed features of the variation of magnetic field properties in AR sunspots are similar for all of the considered eruptive events. It is shown that, after the flare onset in six AR sunspots on August 2, 2011, the behavior of the specified magnetic field parameters changes in comparison with that observed before the flare onset.
About the authors
Yu. S. Zagainova
Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation
Author for correspondence.
Email: yuliazag@izmiran.ru
Russian Federation, Troitsk, Moscow, 108840
V. G. Fainshtein
Institute of Solar–Terrestrial Physics
Email: yuliazag@izmiran.ru
Russian Federation, Irkutsk, 664003
G. V. Rudenko
Institute of Solar–Terrestrial Physics
Email: yuliazag@izmiran.ru
Russian Federation, Irkutsk, 664003
V. N. Obridko
Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation
Email: yuliazag@izmiran.ru
Russian Federation, Troitsk, Moscow, 108840
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