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Author Sharykin, I. N. ♦ Zimovets, I. V. ♦ Kosovichev, A. G. ♦ Sadykov, V. M. ♦ Myshyakov, I. I.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword ASTROPHYSICS, COSMOLOGY AND ASTRONOMY ♦ CHROMOSPHERE ♦ COSMIC X-RAY SOURCES ♦ DISTURBANCES ♦ ELECTRONS ♦ EMISSION ♦ FORECASTING ♦ HARD X RADIATION ♦ HYDRODYNAMIC MODEL ♦ HYDRODYNAMICS ♦ MAGNETIC FIELDS ♦ PHOTOSPHERE ♦ SOLAR FLARES ♦ SPATIAL RESOLUTION ♦ SUN ♦ X-RAY SOURCES
Abstract The X-class solar flare of 2012 October 23 generated continuum photospheric emission and a strong helioseismic wave (“sunquake”) that points to an intensive energy release in the dense part of the solar atmosphere. We study properties of the energy release with high temporal and spatial resolutions, using photospheric data from the Helioseismic Magnetic Imager (HMI) on board Solar Dynamics Observatory , and hard X-ray observations made by RHESSI . For this analysis we use level-1 HMI data (filtergrams), obtained by scanning the Fe i line (6731 Å) with the time cadence of ∼3.6 s and spatial resolution of ∼0.″5 per pixel. It is found that the photospheric disturbances caused by the flare spatially coincide with the region of hard X-ray emission but are delayed by ≲4 s. This delay is consistent with predictions of the flare hydrodynamics RADYN models. However, the models fail to explain the magnitude of variations observed by the HMI. The data indicate that the photospheric impact and helioseismic wave might be caused by the electron energy flux, which is substantially higher than that in the current flare radiative hydrodynamic models.
ISSN 0004637X
Educational Use Research
Learning Resource Type Article
Publisher Date 2017-07-01
Publisher Place United States
Journal Astrophysical Journal
Volume Number 843
Issue Number 1


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