DYNAMICS of ELECTRIC CURRENTS, MAGNETIC FIELD TOPOLOGY, and HELIOSEISMIC RESPONSE of A SOLAR FLARE

Document Type

Article

Publication Date

7-20-2015

Abstract

The solar flare on 2011 July 30 was of a modest X-ray class (M9.3), but it made a strong photospheric impact and produced a "sunquake," which was observed with the Helioseismic and Magnetic Imager on board NASA's Solar Dynamics Observatory. In addition to the helioseismic waves, the flare caused a large expanding area of white-light emission and was accompanied by the rapid formation of a sunspot structure in the flare region. The flare produced hard X-ray (HXR) emission less then 300 keV and no coronal mass ejection (CME). The absence of CME rules out magnetic rope eruption as a mechanism of helioseismic waves. The sunquake impact does not coincide with the strongest HXR source, which contradicts the standard beam-driven mechanism of sunquake generation. We discuss the connectivity of the flare energy release with the electric currents dynamics and show the potential importance of high-speed plasma flows in the lower solar atmosphere during the flare energy release.

Identifier

84937708929 (Scopus)

Publication Title

Astrophysical Journal

External Full Text Location

https://doi.org/10.1088/0004-637X/808/1/72

e-ISSN

15384357

ISSN

0004637X

Issue

1

Volume

808

Grant

15-32-21078

Fund Ref

Russian Foundation for Basic Research

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