Particle acceleration in flares |
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| Authors: | A O Benz T Kosugi M J Aschwanden S G Benka E L Chupp S Enome H Garcia G D Holman V G Kurt T Sakao A V Stepanov M Volwerk |
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| Institution: | (1) Institute of Astronomy, ETH-Zentrum, CH-8092 Zürich, Switzerland;(2) National Astronomical Observatory, 181 Mitaka, Tokyo, Japan;(3) Department of Astronomy, University of Maryland, College Park, 20742, MD, USA;(4) Naval Research Lab, E.O. Hulburt Center for Space Research, 20375-5352 Washington DC, USA;(5) Physics Department and Space Science Center, University of New Hampshire, 03824 Durham, NH, USA;(6) Nobeyama Radio Observatory, 3814-13 Minmisaku, Nagano, Japan;(7) Space Environment Laboratory, NOAA, 80303 Boulder, CO, USA;(8) Laboratory for Astronomy and Solar Physics, NASA Goddard Space Flight Center, 20771 Greenbelt, MD, USA;(9) Institute for Nuclear Physics, Moscow, Russia;(10) Crimean Astrophysical Observatory, Katzively, Ukraine;(11) Sterrekundig Instituut Utrecht, P.O. Box 80000, NL-3508 TA Utrecht, The Netherlands |
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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,  -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.Report of Team 3, Flares 22 Workshop, Ottawa, May 25–28, 1993. |
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