Superluminal apparent velocities of relativistic electron beams in the solar corona

Details Superluminal apparent velocities of relativistic electron beams in the solar corona Superluminal apparent velocities of relativistic electron beams in the solar corona

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...410..307k&link_type=abstract

Astronomy and Astrophysics, v.410, p.307-314 (2003)

Astronomy and Astrophysics

Astrophysics

9

Plasmas, Sun: Corona, Sun: Particle Emission, Sun: Radio Radiation

Scientific paper

We present spectral and imaging observations of high frequency type III bursts appearing in pairs: a primary fast drifting component and a secondary ``normal" drifting component. The primary bursts have generally higher frequency drift and start at higher frequencies. They show superluminal velocities up to 2.5 c (c, speed of light), while the secondary component shows the usual <0.5 c velocity expected for type III burst exciters. These superluminal velocities are explained as apparent velocities of relativistic electron beams propagating nearly along the line of sight towards the observer with velocities close to the speed of light. A model of type III burst pairs consisting of subsequent fast drifting and ``normal" drifting components is presented.

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