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Flare of 1970 March 01: A Review and Further Evidence for Adiabatic Heating

Published online by Cambridge University Press:  14 August 2015

C. Mätzler  and
H.J. Wiehl
C. Mätzler
Affiliation:
Institute of Applied Physics University of Berne Sidlerstrasse 5 / 3012 Berne Switzerland
H.J. Wiehl
Affiliation:
Institute of Applied Physics University of Berne Sidlerstrasse 5 / 3012 Berne Switzerland

Summary

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The microwave and hard-X-ray burst of 1970 March 01, 11:27 UT was found to originate from a common thermal plasma with a maximum temperature of 57 keV. The low coronal plasma with an average electron density of about 3.108cm−3 covered a projected area of 5.1018 cm2. In Fig. 1 the time profiles of the emission measure and the temperature are compared with the 10.5 GHz flux while Fig. 2 shows the reversible relationship between the hard X-ray emission measure and temperature during the impulsive phase. The arrows indicate the direction of increasing time. The dashed-dotted line, representing an adiabatic process with an index χ = 5/3, agrees well with the observations showing a compression followed by an expansion (Mätzler et al. 1978).

Type
Session III - Solar Bursts - cm Wavelengths
Information
Symposium - International Astronomical Union , Volume 86: Radio Physics of the Sun , 1980 , pp. 177 - 181
Copyright
Copyright © Reidel 1980 

References

Mätzler, C., Bai, T., Crannell, C., Frost, K.: 1978, Ap.J. 223, 1058 CrossRefGoogle Scholar
Mätzler, C.: 1978b, in Proc. 2nd European Conf. on solar Phys., Coll. internat. CNRS No. 282, Dumont, S. and Ruesch, J. (editors) p. 251 Google Scholar
Wiehl, H., Mätzler, C.: 1979, to be published in Astron. + Astrophys.Google Scholar