Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh33a2042k&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SH33A-2042
Astronomy and Astrophysics
Astrophysics
[7519] Solar Physics, Astrophysics, And Astronomy / Flares, [7522] Solar Physics, Astrophysics, And Astronomy / Helioseismology, [7524] Solar Physics, Astrophysics, And Astronomy / Magnetic Fields
Scientific paper
The solar flare of July 30, 2011 (start time 2:04UT), in active region NOAA 11261, observed with the Helioseismic and Magnetic Imager (HMI) on Solar Dynamics Observatory, had a modest X-ray class (M9), but it made a very strong photospheric impact. The flare generated helioseismic waves, "sunquakes" (also observed with the SDO/AIA instrument), caused a large expanding area of white-light emission, and was accompanied by substantial restructuring of magnetic field around the magnetic neutral line in the flare region. Surprisingly, there was no significant hard X-ray emission and coronal mass ejection, associated with this flare. This provides an indication that the flare energy release was probably confined in the lower atmosphere. We present results of initial analysis of the SDO data, and discuss new challenges from these observations for the standard flare model.
Desai Prasun
Hayashi Kumiko
Kosovichev Alexander
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