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Arnold O. Benz   Submitted: 2003-02-25 01:12

A popular scenario for electron acceleration in solar flares is transit-time damping of low-frequency MHD waves excited by reconnection and its outflows. The scenario requires several processes in sequence to yield energetic electrons of the observed large number. Until now there was very little evidence for this scenario, as it is even not clear where the flare energy is released. RHESSI measurements of bremsstrahlung by non-thermal flare electrons yield energy estimates as well as the position where the energy is deposited. Thus quantitative measurements can be put into the frame of the global magnetic field configuration as seen in coronal EUV line observations. We present RHESSI observations combined with TRACE data that suggest primary energy inputs mostly into electron acceleration and to a minor fraction into coronal heating and primary motion. The more sensitive and lower energy X-ray observations by RHESSI have found also small events (C class) at the time of the acceleration of electron beams exciting meter wave Type III bursts. However, not all RHESSI flares involve Type III radio emissions. The association of other decimeter radio emissions, such as narrowband spikes and pulsations, with X-rays is summarized in view of electron acceleration.

Authors: Benz, A. O. and Saint-Hilaire, P.
Projects: RHESSI

Publication Status: Adv. Space Res. 32, 2415 - 2423 (2003)
Last Modified: 2005-11-21 03:27
Go to main E-Print page  Overview of Solar Flares: The Yohkoh perspective  The association of transequatorial loops in the solar corona with coronal mass ejection onset  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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