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Solar Flares: The Impulsive Phase

Published online by Cambridge University Press:  12 April 2016

Brian R. Dennis  and
Richard A. Schwartz
Brian R. Dennis
Affiliation:
Solar Physics Branch, Laboratory for Astronomy and Solar Physics, Goddard Space Flight Center, Greenbelt, MD 20771, U.S.A.
Richard A. Schwartz
Affiliation:
STX Corporation, Lanham, MD 20706, U.S.A.

Abstract

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Only during the previous solar cycle have systematic observations begun to be made with the sensitivity and time resolution, and the continuous coverage required to catch the impulsive phase and measure the rapid variations present in many wavelength ranges. Observations in X-rays, gamma-rays, UV, Ha, and radio wavelengths all reveal rapid variations during the impulsive phase and have contributed to our understanding of the different phenomena involved. Results have been obtained from several spacecraft, from rocket and balloon flights, and from ground-based observations. These are reviewed in the context of a simple single loop flare model with a view to showing what results are consistent with this model and what the major problems are in our understanding of the impulsive phase. New instrumentation planned for observations during the present Cycle 22 will provide a concerted attack on the impulsive phase as part of the Max'91 program.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 104 , Issue 1: Solar and Stellar Flares , 1989 , pp. 75 - 94
Copyright
Copyright © Kluwer 1989

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