Physics – Plasma Physics
Scientific paper
Oct 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aps..dppgi2006h&link_type=abstract
American Physical Society, 42nd Annual Meeting of the APS Division of Plasma Physics combined with the 10th International Congre
Physics
Plasma Physics
Scientific paper
The acceleration of electrons in astrophysical systems, such as supernova remnants, is still an enigma. Although the presence of highly relativistic electrons manifests itself through synchrotron or inverse Compton radiation, it remains unclear how they can reach Lorentz factors of 2000 above which they can be efficiently accelerated in shock waves. Various proposals have been made how to overcome the so-called injection problem. In view of this lack of understanding, it is surprising how little attention has been paid to the auroral acceleration process in the wider astrophysical context. By summarising the basic ingredients of this process and casting them into simply applicable relations, it will be shown how field-aligned potential drops may be set up in the environment of magnetised stars. This can make them efficient accelerators of highly relativistic electrons manifesting themselves as gamma-ray sources. Particular attention will be given to field-aligned particle acceleration in solar flares, which appears to be the nearest realisation of the auroral process operating in a hot stellar environment.
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