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Observation of Seismic Effects of Solar Flares from the SOHO Michelson Doppler Imager

Published online by Cambridge University Press:  08 February 2017

A.G. Kosovichev  and
V.V. Zharkova
A.G. Kosovichev
Affiliation:
W.W. Hansen Experimental Physics Lab., Stanford Univ., U.S.A.
V.V. Zharkova
Affiliation:
Department of Physics and Astronomy, Glasgow University, U.K.

Abstract

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Solar flares are the strongest localized seismic disturbances on the solar surface. During the impulsive phase a high-energy electron beam heats the chromosphere, resulting in explosive evaporation of chromospheric plasma at supersonic velocities. This upward motion is balanced by a downward recoil in the lower part of the chromosphere that excites propagating waves in the solar interior. On the solar surface the outgoing circular flare waves resemble ripples from a pebble thrown into a pond. We report on first observations of the seismic effects of a solar flare from the SOHO Michelson Doppler Imager (MDI) and compare the results with a theoretical model. Observation of flare seismic waves provide important information about the flare mechanism and about the subphotospheric structure of active regions.

Type
IV. Solar Small-Scale Structure
Information
Symposium - International Astronomical Union , Volume 185: New Eyes to See Inside the Sun and Stars , 1998 , pp. 191 - 194
Copyright
Copyright © Kluwer 1998 

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