Fragmented structure of interplanetary type II bursts

Details Fragmented structure of interplanetary type II bursts Fragmented structure of interplanetary type II bursts

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jgr...10625313t&link_type=abstract

Journal of Geophysical Research, Volume 106, Issue A11, p. 25313-25322

Physics

Plasma Physics

1

Solar Physics, Astrophysics, And Astronomy: Radio Emissions, Space Plasma Physics: Radiation Processes, Space Plasma Physics: Shock Waves

Scientific paper

We present the Ulysses observations of a highly fragmented interplanetary type II burst and an associated pair of forward shocks. We argue that the coupling of Langmuir waves excited by one of these shocks with escaping radiation at the sharp density gradient associated with the companion shock is responsible for the clumpiness of the type II event. This linear coupling process is shown to cause large fluctuations in the efficiency of conversion of Langmuir waves into electromagnetic radiation at the fundamental of the electron plasma frequency fpe, leading to the fragmentary structure of the type II radio burst.

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