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Title:
Seismic Images of a Solar Flare
Authors:
Donea, A.-C.; Braun, D. C.; Lindsey, C.
Publication:
The Astrophysical Journal, Volume 513, Issue 2, pp. L143-L146. (ApJL Homepage)
Publication Date:
03/1999
Origin:
APJ
ApJ Keywords:
SUN: FLARES, SUN: OSCILLATIONS, SUN: SUNSPOTS
DOI:
10.1086/311915
Bibliographic Code:
1999ApJ...513L.143D

Abstract

We have used helioseismic holography to render seismic images of the solar flare of 1996 July 9, whose helioseismic signature was recently reported by Kosovichev & Zharkova. We computed time series of ``egression power maps'' in 2 mHz bands centered at 3.5 and 6 mHz. These images suggest an oblong acoustic source associated with the flare some 18 Mm in the north-south direction and approximately 15 Mm in the east-west direction. The considerable preponderance of the flare acoustic power emanates in the 3.5 mHz band. However, because the ambient noise in the 6 mHz band is much lower and the diffraction limit for 6 mHz waves is much finer, the flare is rendered far more clearly in the 6 mHz band. The 6 mHz flare signature lags the 3.5 mHz by approximately 4 minutes.
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