What can He II 304 Å tell us about transient seismic emission from solar flares?

After neary 20 years since their discovery by Kosovichev and Zharkova, the mechanics of the release of seismic transients into the solar interior from some flares remain a mystery. Seismically emissive flares invariably show the signatures of intense chromosphere heating consistent with pressure var...

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Bibliographic Details
Published inProceedings of the International Astronomical Union Vol. 12; no. S327; pp. 113 - 116
Main Authors Lindsey, C., Donea, A. C.
Format Journal Article
LanguageEnglish
Published Cambridge, UK Cambridge University Press 01.10.2016
Subjects
Astronomy
Chromosphere
Contributed Papers
Diagnostic systems
Emission
Emissivity
Heating
Magnetic variations
Signatures
Solar activity
Solar flares
Solar interior
Solar observatories
Transient heating
Sun: flares
UV radiation
chromosphere
magnetic fields
helioseismology
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Summary:After neary 20 years since their discovery by Kosovichev and Zharkova, the mechanics of the release of seismic transients into the solar interior from some flares remain a mystery. Seismically emissive flares invariably show the signatures of intense chromosphere heating consistent with pressure variations sufficient to drive seismic transients commensurate with helioseismic observations—under certain conditions. Magnetic observations show the signatures of apparent magnetic changes, suggesting Lorentz-force transients that could likewise drive seismic transients—similarly subject to certain conditions. But, the diagnostic signatures of both of these prospective drivers are apparent over vast regions from which no significant seismic emission emanates. What distinguishes the source regions of transient seismic emission from the much vaster regions that show the signatures of both transient heating and magnetic variations but are acoustically unproductive? Observations of acoustically active flares in He II 304 Å by the Atomospheric Imaging Assembly (AIA) aboard the Solar Dynamics Observatory (SDO) offer a promising new resource with which to address this question.
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ISSN:1743-9213
1743-9221
DOI:10.1017/S1743921317004525