Electron beams generated by shock waves in the solar corona

Details Electron beams generated by shock waves in the solar corona Electron beams generated by shock waves in the solar corona

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...441..319m&link_type=abstract

Astronomy and Astrophysics, Volume 441, Issue 1, October I 2005, pp.319-326

Astronomy and Astrophysics

Astrophysics

25

Acceleration Of Particles, Magnetic Fields, Sun: Radio Radiation

Scientific paper

Beams of energetic electrons can be generated by shock waves in
the solar corona. At the Sun shock waves are
produced either by flares and/or by coronal mass ejections (CMEs).
They can be observed as type II bursts in the solar radio
radiation. Shock accelerated electron beams appear as rapidly
drifting emission stripes (so-called “herringbones”)
in dynamic radio spectra of
type II bursts. A large sample of type II bursts
showing “herringbones” was statistically analysed with respect to
their properties in dynamic radio spectra. The electron beams
associated with the “herringbones” are considered to be
generated by shock drift acceleration. Then, the accelerated
electrons establish a shifted loss-cone distribution in the
upstream region of the associated shock wave. Such a distribution
causes plasma instabilities leading to the emission of
radio waves observed as “herringbones”. Consequences
of a shifted loss-cone distribution of the shock accelerated electrons
are discussed in comparison with the observations of “herringbones”
within solar type II radio bursts.

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