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Enhanced Turbulence and Heating Observed Preceding the Impulsive Phase in a Solar Flare

Published online by Cambridge University Press:  27 September 2017

Chung-Chieh Cheng  and
K.G. Widing
Chung-Chieh Cheng
Affiliation:
E.O. Hulburt Center for Space Research, Naval Research Laboratory, Washington, D.C., 20375-5000. U.S.A.
K.G. Widing
Affiliation:
E.O. Hulburt Center for Space Research, Naval Research Laboratory, Washington, D.C., 20375-5000. U.S.A.

Abstract

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We studied the unique EUV spectra of the 21 Jan. 1974 flare observed by the NRL Normal-Incidence Slit Spectrometer (SO 82B) onboard the Skylab. The results show that the pre-impulsive transition region plasmas exhibited enhanced turbulence and heating before the acceleration of energetic particles. The absence of blue-shifted components in the Fe XXI line profiles shows that the chromospheric evaporation is not important in this flare.

Type
Session II: Solar Flares
Information
International Astronomical Union Colloquium , Volume 104 , Issue 2: Solar and Stellar Flares , 1989 , pp. 231 - 234
Copyright
Copyright © Kluwer 1989

References

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