Shock drift electron acceleration in a wavy shock front

Citation
M. Vandas et M. Karlicky, Shock drift electron acceleration in a wavy shock front, SOLAR PHYS, 197(1), 2000, pp. 85-99
Citations number
21
Categorie Soggetti
Space Sciences
Journal title
SOLAR PHYSICS
ISSN journal
00380938 → ACNP
Volume
197
Issue
1
Year of publication
2000
Pages
85 - 99
Database
ISI
SICI code
0038-0938(200011)197:1<85:SDEAIA>2.0.ZU;2-0
Abstract
It is commonly believed that solar type II bursts are caused by accelerated electrons at a shock front. Holman and Pesses (1983) suggested that electr ons creating type II bursts are accelerated by the shock drift mechanism. Z lobec et al. (1993) dealt with a fine structure of type II bursts (herringb ones) and suggested a qualitative model where electrons are accelerated by a nearly perpendicular wavy shock front. Using this idea, we developed a mo del of electron acceleration by such a wavy shock front. Electrons are acce lerated by the drift mechanism in the shock layer. Under simplifying assump tions it is possible to obtain an analytical solution of electron motion in the wavy shock front. The calculations show that electrons are rarely refl ected more than once at the wavy shock front and that their final energy is mostly 1-3 times the initial one. Their acceleration does not depend signi ficantly on shock spatial parameters. In the present model all electrons ar e eventually transmitted downstream where they form two downstream beams. R esulting spectral and angular distributions of accelerated electrons are pr esented and the relevance of the model to the herringbone beams is discusse d.