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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

Bartoe, J.-D., Brueckner, G.E., Purcell, J.D., and Tousey, R. 1977, Appl. Optics. 16, 879.Google Scholar
Brueckner, G.E. 1976, Phil. Trans. Roy. Soc. London A. 281, 443.Google Scholar
Cheng, C.-C. 1977, Ap.J., 213, 558.Google Scholar
Cheng, C.-C. 1978, Solar Phys.. 56, 205.Google Scholar
Dere, K.P., and Cook, J.W. 1979, Ap.J., 229, 772.CrossRefGoogle Scholar
doschek, G.A., Feldman, U., and Rosenberg, F.D. 1977, Ap. J., 215, 329.CrossRefGoogle Scholar
widing, K.G., and Hiei, E. 1984, Ap.J., 281, 426.Google Scholar