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Title: RETURN CURRENTS AND ENERGY TRANSPORT IN THE SOLAR FLARING ATMOSPHERE

According to the standard Ohmic perspective, the injection of accelerated electrons into the flaring region violates local charge equilibrium and therefore, in response, return currents are driven by an electric field to equilibrate such charge violation. In this framework, the energy loss rate associated with these local currents has an Ohmic nature and significantly shortens the accelerated electron path. In the present paper, we adopt a different viewpoint and, specifically, we study the impact of the background drift velocity on the energy loss rate of accelerated electrons in solar flares. We first utilize the Rutherford cross-section to derive the formula of the energy loss rate when the collisional target has a finite temperature and the background instantaneously and coherently moves up to equilibrate the electron injection. We then use the continuity equation for electrons and imaging spectroscopy data provided by RHESSI to validate this model. We show that this new formula for the energy loss rate provides a better fit of the experimental data with respect to the model based on the effects of standard Ohmic return currents.
Authors:
; ; ;  [1]
  1. Dipartimento di Matematica, Universita di Genova, via Dodecaneso 35, I-16146 Genova (Italy)
Publication Date:
OSTI Identifier:
22131000
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 773; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; CONTINUITY EQUATIONS; CROSS SECTIONS; CURRENTS; ELECTRIC FIELDS; ELECTRON BEAM INJECTION; ELECTRONS; ENERGY LOSSES; ENERGY TRANSFER; EXPERIMENTAL DATA; FLARING; RUTHERFORD SCATTERING; SOLAR FLARES; SPECTROSCOPY