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Microwave Burst Timescales and Solar Flare Acceleration Processes

Published online by Cambridge University Press:  12 April 2016

A. Krüger
Affiliation:
Astrophysical Institute Potsdam, D-14482 Potsdam, Germany
B. Kliem
Affiliation:
Astrophysical Institute Potsdam, D-14482 Potsdam, Germany
J. Hildebrandt
Affiliation:
Astrophysical Institute Potsdam, D-14482 Potsdam, Germany
V. V. Zaitsev
Affiliation:
Institute of Applied Physics, Russian Academy of Sciences, Nizhnij Novgorod, 603600, Russia

Abstract

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The occurrence of quite different timescales in solar microwave bursts is considered and possible ways of their physical interpretation are discussed. An interesting feature is the existence of hierarchic time structures, an example of which is provided by the solar event of 1991 March 23.

Plasma parameter sets to be invoked for the interpretation of timescales are estimated on the base of different models such as the collisionless conduction front model, the twisted magnetic loop model, the coalescence model, and the electric circuit model. With emphasis on the interpretation of burst fine structures with timescales of a few seconds the coalescence model has been favored. On the other hand, the simultaneous occurrence of a large range of different timescales appears well suited to be described by the circuit model.

Subject headings: acceleration of particles — Sun: flares — Sun: radio radiation

Type
Poster Papers
Copyright
Copyright © The American Astronomical Society 1994

References

Alfvén, H., & Carlquist, P. 1967, Sol. Phys., 1, 220 Google Scholar
Aschwanden, M.J., Benz, A.O., & Schwartz, R.A. 1993, ApJ, 417, 790 Google Scholar
Batchelor, D.A. 1987, in Rapid Fluctuations in Solar Flares, ed. Dennis, B. R., Orwing, L.E., & Kiplinger, A.L. (NASA CP-2449), 35 Google Scholar
Batchelor, D.A. 1989, ApJ, 340, 607 Google Scholar
Batchelor, D.A. 1990, ApJS, 73, 131 Google Scholar
Batchelor, D.A., Crannell, C.J., Wiehl, H.J., & Magun, A. 1985, ApJ, 295, 258 Google Scholar
Benz, A.O. 1985, Sol. Phys., 96, 357 CrossRefGoogle Scholar
Bhattacharjee, A., Brunel, F., & Tajima, T. 1983, Phys. Fluids, 26, 3332 Google Scholar
Brown, J.C., Melrose, D.B., & Spicer, D.S. 1979, ApJ, 228, 592 Google Scholar
Covington, A.E. 1958, JRASC, 52, 161 Google Scholar
Cowling, T.G. 1957, Magnetohydrodynamics (New York: Interscience), 107 Google Scholar
Dahlburg, R.B., Antiochos, S.K., & Zang, T.A. 1991, ApJ, 383, 420 CrossRefGoogle Scholar
de Jager, C., & de Jonge, G. 1978, Sol. Phys., 58, 127 Google Scholar
Holman, G.D. 1985, ApJ, 293, 584 Google Scholar
Holman, G.D. & Benka, S.G. 1992, ApJ, 400, L79 Google Scholar
Hurford, G.J., Marsh, K.A., Zirin, H., Kaufmann, P., & Strauss, F.M. 1979, BAAS, 11, 678 Google Scholar
Kaufmann, P., Correia, E., Costa, J.E.R., & Zodi Vaz, A.M. 1986, A&A, 157, 11 Google Scholar
Kaufmann, P., Strauss, F.M., Opher, R., & Laporte, C. 1980, A&A, 87, 58 Google Scholar
Kliem, B. 1988, in Reconnection in Space Plasma, vol. 2, ed. Guyenne, T. D. & Hunt, J.J. (ESA SP-285) (Noordwijk: ESA), 117 Google Scholar
Kliem, B. 1994, ApJS, in pressGoogle Scholar
Krüger, A. 1979, Introduction to Solar Radio Astronomy and Radio Physics (Dordrecht: Reidel)CrossRefGoogle Scholar
Krüger, A., Aurass, H., Kliem, B., & Urpo, S. 1987, Proc. lOth European Regional Astron. Meeting of 1AU, Publ. Astron. Inst. Czechoslovakian Acad. Sci., 66, 245 Google Scholar
Krüger, A., Kliem, B., & Hildebrandt, J. 1988, in Reconnection in Space Plasma, vol. 2, ed. Guyenne, T.D. & Hunt, J.J. (ESA SP-285) (Noordwijk: ESA), 169 Google Scholar
Kundu, M.R., & Vlahos, L. 1982, Space Sci. Rev., 32, 379 Google Scholar
Leboueuf, J.N., Tajima, T., & Dawson, J.M. 1982, Phys. Fluids, 25, 784 Google Scholar
Pritchett, P.L., & Wu, C.C. 1979, Phys. Fluids, 22, 2140 CrossRefGoogle Scholar
Pustilnik, L.A. 1973, AZh, 50, 1211 Google Scholar
Roberts, B., Edwin, P.M., & Benz, A.O. 1984, ApJ, 279, 857 CrossRefGoogle Scholar
Sakai, S.I., & Ohsawa, Y. 1987, Space Sci. Rev., 46, 113 Google Scholar
Sturrock, P.A., Kaufmann, P., Moore, R.L., & Smith, D.F. 1984, Sol. Phys., 94, 341 CrossRefGoogle Scholar
Tajima, T., Brunel, F., & Sakai, J. 1982, ApJ, 258, L45 Google Scholar
Tajima, T., Sakai, J., Nakajma, T., Kosugi, T., Brunel, F., & Kundu, M.R. 1987, ApJ, 321, 1031 Google Scholar
Takakura, T., Kaufmann, P., Costa, J.E.R., Degaonkar, S.S., Ohki, K., & Nitta, N. 1983, Nature, 302, 317 CrossRefGoogle Scholar
Tlamicha, A., Ambrožová, Z., & Sigmund, T. 1991, Publ. Astron. Inst. Czechoslovakian Acad. Sci. No. 78 Google Scholar
Urpo, S., Pohjolainen, S., & Teräsranta, H. 1992, Helsinki University of Technology, Metsähovi Research Station Report Series A, 12Google Scholar
Zaitsev, V.V., & Stepanov, A.V. 1989, Soviet Astron. Lett., 15, 154 Google Scholar
Zaitsev, V.V., & Stepanov, A.V. 1991, AZh, 68, 384 Google Scholar
Zaitsev, V.V., & Stepanov, A.V. 1992, Sol. Phys., 139, 343 Google Scholar