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Particle acceleration in flares

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Abstract

Particle acceleration is intrinsic to the primary energy release in the impulsive phase of solar flares, and we cannot understand flares without understanding acceleration. New observations in soft and hard X-rays, γ-rays and coherent radio emissions are presented, suggesting flare fragmentation in time and space. X-ray and radio measurements exhibit at least five different time scales in flares. In addition, some new observations of delayed acceleration signatures are also presented. The theory of acceleration by parallel electric fields is used to model the spectral shape and evolution of hard X-rays. The possibility of the appearance of double layers is further investigated.

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Authors and Affiliations

  1. Institute of Astronomy, ETH-Zentrum, CH-8092, Zürich, Switzerland

    A. O. Benz

  2. National Astronomical Observatory, 181, Mitaka, Tokyo, Japan

    T. Kosugi & T. Sakao

  3. Department of Astronomy, University of Maryland, College Park, 20742, MD, USA

    M. J. Aschwanden

  4. Naval Research Lab, E.O. Hulburt Center for Space Research, 20375-5352, Washington DC, USA

    S. G. Benka

  5. Physics Department and Space Science Center, University of New Hampshire, 03824, Durham, NH, USA

    E. L. Chupp

  6. Nobeyama Radio Observatory, 3814-13, Minmisaku, Nagano, Japan

    S. Enome

  7. Space Environment Laboratory, NOAA, 80303, Boulder, CO, USA

    H. Garcia

  8. Laboratory for Astronomy and Solar Physics, NASA Goddard Space Flight Center, 20771, Greenbelt, MD, USA

    G. D. Holman

  9. Institute for Nuclear Physics, Moscow, Russia

    V. G. Kurt

  10. Crimean Astrophysical Observatory, Katzively, Ukraine

    A. V. Stepanov

  11. Sterrekundig Instituut Utrecht, P.O. Box 80000, NL-3508, TA Utrecht, The Netherlands

    M. Volwerk

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  1. A. O. Benz
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  2. T. Kosugi
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  3. M. J. Aschwanden
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  4. S. G. Benka
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  5. E. L. Chupp
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  6. S. Enome
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  7. H. Garcia
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  8. G. D. Holman
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  9. V. G. Kurt
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  10. T. Sakao
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  11. A. V. Stepanov
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  12. M. Volwerk
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Additional information

Report of Team 3, Flares 22 Workshop, Ottawa, May 25–28, 1993.

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Benz, A.O., Kosugi, T., Aschwanden, M.J. et al. Particle acceleration in flares. Sol Phys 153, 33–53 (1994). https://doi.org/10.1007/BF00712491

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  • DOI: https://doi.org/10.1007/BF00712491

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