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Pulsed Acceleration in Solar Flares

Published online by Cambridge University Press:  12 April 2016

Markus J. Aschwanden ,
Arnold O. Benz ,
Brian R. Dennis  and
Mukul R. Kundu
Markus J. Aschwanden
Affiliation:
University of Maryland, Astronomy Department, College Park, MD 20742
Arnold O. Benz
Affiliation:
Institute of Astronomy, Federal Institute of Technology (ETH), CH-8092 Zurich, Switzerland
Brian R. Dennis
Affiliation:
Laboratory for Astronomy and Solar Physics, NASA/Goddard Space Flight Center, Code 682, Greenbelt, MD 20771
Mukul R. Kundu
Affiliation:
University of Maryland, Astronomy Department, College Park, MD 20742

Abstract

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We study the nonlinear dynamics of particle acceleration in solar flares by analyzing the time series of various quasi-periodic radio signatures during flares. In particular we present the radio and hard X-ray data of three flares which support the following tentative conclusions:

  1. 1. Particle acceleration and injection into magnetic structures occurs intrinsically in a pulsed mode (with a typical period of 1-2 s), produced by a single, spatially coherent, nonlinear system, rather than by a stochastic system with many spatially independent components (“statistical flare” produced by a fragmented primary energy release).

  2. 2. The nonlinear (quasi-periodic) mode of pulsed particle acceleration and injection into a coronal loop can be stabilized by phase locking with an MHD wave (oscillation) mode, if both periods are close to each other.

  3. 3. Pulsed injection of electron beams into a coronal loop may trigger nonlinear relaxational oscillations of wave-particle interactions. This is particularly likely when the limit cycles of both systems are similar.

Subject headings: acceleration of particles— Sun: corona — Sun: flares — Sun: radio radiation — Sun: X-rays, gamma rays

Type
Solar Flares
Information
International Astronomical Union Colloquium , Volume 142: Particle Acceleration Phenomena in Astrophysical Plasmas , 1994 , pp. 631 - 638
Copyright
Copyright © The American Astronomical Society 1994

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