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Observations of a post-flare radio burst in X-rays

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Abstract

More than six hours after the two-ribbon flare of 21 May 1980, the hard X-ray spectrometer aboard the SMM imaged an extensive arch above the flare region which proved to be the lowest part of a stationary post-flare noise storm recorded at the same time at Culgoora. The X-ray arch extended over 3 or more arc minutes to a projected distance of 95 000 km, and its real altitude was most probably between 110 000 and 180 000 km. The mean electron density in the cloud was close to 109 cm−3 and its temperature stayed for many hours at a fairly constant value of about 6.5 × 106 K. The bent crystal spectrometer aboard the SMM confirms that the arch emission was basically thermal. Variations in brightness and energy spectrum at one of the supposed footpoints of the arch seem to correlate in time with radio brightness suggesting that suprathermal particles from the radio noise regions dumped in variable quantities into the low corona and transition layer; these particles may have contributed to the population of the arch, after being trapped and thermalized. The arch extended along the H ∥ = 0 line thus apparently hindering any upward movement of the upper loops reconnected in the flare process. There is evidence from Culgoora that this obstacle may have been present above the flare since 15–30 min after its onset.

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References

  • Acton, L. W., Culhane, J. L., Gabriel, A. H., and 21 co-authors: 1980, Solar Phys. 65, 53.

    Google Scholar 

  • Allen, C. W.: 1976, Astrophysical Quantities, Third revised edition, The Athlone Press, University of London.

  • Anzer, U. and Pneuman, G. W.: 1982, Solar Phys., in press.

  • Boelec, A.: 1982, Thesis, State University of Utrecht, The Netherlands.

    Google Scholar 

  • Brown, J. C.: 1971, Solar Phys. 18, 481.

    Google Scholar 

  • Culhane, J. L., Gabriel, A. H., Acton, L. W., Rapley, C. G., Phillips, K. J. H., Wolfson, C. J., and 12-co-authors: 1981, Astrophys. J. Letters 244, L 141.

    Google Scholar 

  • Doyle, J. G. and Raymond, J. C.: 1981, Monthly Notices Roy. Astron. Soc., in press.

  • Gabriel, A. H., Acton, L. W., Culhane, J. L., Phillips, K. J. H., Wolfson, C. J., Rapley, C. G., and 9 co-authors: 1981, Astrophys. J. Letters 244, L 147.

    Google Scholar 

  • Gaizauskas, V.: 1981, presentation to the FBS Workshop, GSFC, February 1981.

  • Hoyng, P., Duijveman, A., Machado, M. E., Rust, D. M., Švestka, Z. Boelee, A., Frost, K. J., Lafleur, H., Simnett, G. M., Van Beek, H. F., and Woodgate, B. E.: 1981, Astrophys. J. Letters 246, L155.

    Google Scholar 

  • Kopp, R. A. and Pneuman, G. W.: 1976, Solar Phys. 50, 85.

    Google Scholar 

  • Kuperus, M. and Van Tend, W.: 1981, paper in preparation.

  • Moore, R., McKenzie, D. L., Švestka, Z., Widing, K. G., and 12 co-authors: 1979, in P. A. Sturrock (ed.), Solar Flares, Proceedings of the Second Skylab Workshop, Colorado Associated University Press, p. 341.

  • Nolte, J. T., Gerassimenko, M., Krieger, A. S., Petrasso, R. D., and Švestka, Z.: 1979, Solar Phys. 62, 123.

    Google Scholar 

  • Petrasso, R. D., Nolte, J. T., Gerassimenko, M., Krieger, A. S., Krogstad, R., Seguin, F. H., and Švestka, Z.: 1979, Solar Phys. 62, 133.

    Google Scholar 

  • Pneuman, G. W.: 1981, Solar Phys., in press.

  • Raymond, J. C., Cox, D. P., and Smith, B. W.: 1976, Astrophys. J. 204, 290.

    Google Scholar 

  • Stewart, R. T.: 1976, Solar Phys. 50, 437.

    Google Scholar 

  • Švestka, Z.: 1976, Solar Flares, D. Reidel Publ. Co., Dordrecht, Holland.

    Google Scholar 

  • Švestka, Z., Martin, S. F., and Kopp, R. A.: 1980, in M. Dryer and E. Tandberg-Hanssen (eds.), ‘Solar and Interplanetary Dynamics’, IAU Symp. 91, 217.

  • Švestka, Z., Dodson-Prince, H. W., Martin, S. F., Mohler, O. C., Moore, R. L., Nolte, J. T., and Petrasso, R.: 1982a, Solar Phys., in press.

  • Švestka, Z., Dennis, B. R., Pick, M., Raoult, A., Rapley, C. G., Stewart, R. T., and Woodgate, B. F.: 1982b, Solar Phys., submitted.

  • Van Beek, H. F., Hoyng, P., Lafleur, H., and Simnett, G. M.: 1980, Solar Phys. 65, 39.

    Google Scholar 

  • Webb, D. F. and Kundu, M. R.: 1978, Solar Phys. 57, 155.

    Google Scholar 

  • Woodgate, B. E., Tandberg-Hanssen, E. A., Bruner, E. C., and 11 co-authors: 1980, Solar Phys. 65, 73.

    Google Scholar 

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Authors and Affiliations

  1. Space Research Laboratory of the Astronomical Institute at Utrecht, Utrecht, The Netherlands

    Z. Švestka, P. Hoyng, W. Van Tend, A. Boelee, C. De Jager, H. Lafleur & H. F. Van Beek

  2. Division of Radiophysics, CSIRO, Culgoora, Australia

    R. T. Stewart & G. Nelson

  3. The Department of Astro-Geophysics, University of Colorado, Boulder, Colorado, U.S.A.

    R. T. Stewart & G. Nelson

  4. Lockheed Palo Alto Research Laboratories, Palo Alto, California, U.S.A.

    L. W. Acton & E. C. Bruner

  5. Space and Astrophysics Division, Rutherford and Appleton Laboratories, Chilton, Oxfordshire, UK

    A. H. Gabriel

  6. Mullard Space Science Laboratory, University College London, Holmsbury St. Mary, Dorking, UK

    C. G. Rapley

  7. Department of Space Research, University of Birmingham, Birmingham, UK

    G. M. Simnett

  8. High Altitude Observatory, National Center for Atmospheric Research, Boulder, Colorado, U.S.A.

    W. J. Wagner

Authors
  1. Z. Švestka
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  2. R. T. Stewart
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  3. P. Hoyng
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  4. W. Van Tend
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  5. L. W. Acton
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  6. A. H. Gabriel
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  7. C. G. Rapley
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  8. A. Boelee
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  9. E. C. Bruner
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  10. C. De Jager
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  11. H. Lafleur
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  12. G. Nelson
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  13. G. M. Simnett
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  14. H. F. Van Beek
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  15. W. J. Wagner
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Švestka, Z., Stewart, R.T., Hoyng, P. et al. Observations of a post-flare radio burst in X-rays. Sol Phys 75, 305–329 (1982). https://doi.org/10.1007/BF00153479

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  • DOI: https://doi.org/10.1007/BF00153479

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