Physics – Plasma Physics
Scientific paper
Jun 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.1573b&link_type=abstract
Geophysical Research Letters, Volume 26, Issue 11, p. 1573-1576
Physics
Plasma Physics
82
Solar Physics, Astrophysics, And Astronomy: Radio Emissions, Interplanetary Physics: Interplanetary Shocks, Space Plasma Physics: Radiation Processes, And Astronomy: Coronal Mass Ejections
Scientific paper
We present the first observation of the source region of an interplanetary type II radio burst, using instruments on the Wind spacecraft. Type II radio emission tracks the motion of a CME-driven interplanetary (IP) shock which encounters the spacecraft. Upstream of the IP shock backstreaming electrons are observed, first antiparallel to the interplanetary magnetic field (IMF), and then later parallel as well. Langmuir waves are observed concomitant with the shock-accelerated electrons. The electron energy spectrum and Langmuir wave amplitudes are very similar to those observed in the terrestrial electron foreshock. From the connection times to the shock, we infer the existence and characteristic size of large scale structure on the shock front. The type II radio emission seems to be generated in a small bay upstream of the shock, and this may account for some splitting structure observed in the frequency spectrum of many type II bursts.
Bale Stuart D.
Bougeret Jean-Louis
Kaiser Michael L.
Krucker Sa"m
Larson Davin E.
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