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Title: Evidence for Field-parallel Electron Acceleration in Solar Flares

Abstract

It is proposed that the coincidence of higher brightness and upward electric current observed by Janvier et al. during a flare indicates electron acceleration by field-parallel potential drops sustained by extremely strong field-aligned currents of the order of 10{sup 4} A m{sup −2}. A consequence of this is the concentration of the currents in sheets with widths of the order of 1 m. The high current density suggests that the field-parallel potential drops are maintained by current-driven anomalous resistivity. The origin of these currents remains a strong challenge for theorists.

Authors:
 [1]
  1. Max Planck Institute for Extraterrestrial Physics, Garching (Germany)
Publication Date:
OSTI Identifier:
22679801
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 847; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCELERATION; BRIGHTNESS; CONCENTRATION RATIO; CURRENT DENSITY; ELECTRONS; ELEMENT ABUNDANCE; GAMMA RADIATION; MAGNETIC FIELDS; SOLAR FLARES; SUN; X RADIATION

Citation Formats

Haerendel, G. Evidence for Field-parallel Electron Acceleration in Solar Flares. United States: N. p., 2017. Web. doi:10.3847/1538-4357/AA8995.
Haerendel, G. Evidence for Field-parallel Electron Acceleration in Solar Flares. United States. doi:10.3847/1538-4357/AA8995.
Haerendel, G. Sun . "Evidence for Field-parallel Electron Acceleration in Solar Flares". United States. doi:10.3847/1538-4357/AA8995.
@article{osti_22679801,
title = {Evidence for Field-parallel Electron Acceleration in Solar Flares},
author = {Haerendel, G.},
abstractNote = {It is proposed that the coincidence of higher brightness and upward electric current observed by Janvier et al. during a flare indicates electron acceleration by field-parallel potential drops sustained by extremely strong field-aligned currents of the order of 10{sup 4} A m{sup −2}. A consequence of this is the concentration of the currents in sheets with widths of the order of 1 m. The high current density suggests that the field-parallel potential drops are maintained by current-driven anomalous resistivity. The origin of these currents remains a strong challenge for theorists.},
doi = {10.3847/1538-4357/AA8995},
journal = {Astrophysical Journal},
number = 2,
volume = 847,
place = {United States},
year = {Sun Oct 01 00:00:00 EDT 2017},
month = {Sun Oct 01 00:00:00 EDT 2017}
}