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Title: Electron energy partition in the ‘above-the-looptop’ solar hard X-ray sources

The presentation begins by considering the non-thermal fraction of electron energies (Rε) in 'above-the-looptop' (ALT). Several spectral models area considered: isothermal model, power-law, and the newly derived kappa distribution. Technically, all 3 non-thermal models can fit the data. In the discussion of flare scenario, energy partition, energization mechanism, and collisionality are considered. It is concluded that the kappa distribution works (Rε ≲ 50%), magnetic reconnection scenario works, and Coulomb collisions may reduce the non-thermal fraction of electron energies.
 [1] ;  [2]
  1. University of California, Berkeley
  2. Los Alamos National Laboratory
Publication Date:
OSTI Identifier:
Report Number(s):
DOE Contract Number:
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Resource Relation:
Conference: Plasma Energization: Exchanges between Fluid and Kinetic Scales ; 2015-05-04 - 2015-05-06 ; Los Alamos, New Mexico, United States, Melbourne (Australia), 19-25 Apr 2015
Research Org:
Los Alamos National Laboratory (LANL)
Sponsoring Org:
University of California, Berkeley
Country of Publication:
United States
79 ASTRONOMY AND ASTROPHYSICS Astronomy and Astrophysics