Radiations at Twice the Plasma Frequency Detected Upstream of the Earth's Shock by the CLUSTER/WHISPER Sounder

Details Radiations at Twice the Plasma Frequency Detected Upstream of the Earth's Shock by the CLUSTER/WHISPER Sounder Radiations at Twice the Plasma Frequency Detected Upstream of the Earth's Shock by the CLUSTER/WHISPER Sounder

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsh42c0547t&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SH42C-0547

Astronomy and Astrophysics

Astrophysics

2154 Planetary Bow Shocks, 2159 Plasma Waves And Turbulence, 2784 Solar Wind/Magnetosphere Interactions, 7500 Solar Physics, Astrophysics, And Astronomy, 7599 General Or Miscellaneous

Scientific paper

Radiations at twice the plasma frequency, Fpe, have been commonly observed in the foreshock regions upstream of the Earth's bow shock and far beyond. These electromagnetic radiations are thought to be produced in the electron foreshock and most probably close to the interplanetary magnetic field line tangent to the shock surface. They are often seen simultaneously with suprathermal electrons that are energized at the shock and are backstreaming from it. The objective of the current presentation is to show and discuss a 2Fpe radiation event recorded on the CLUSTER spacecraft by the WHISPER experiment. In particular, the observed strong modulations of the 2Fpe signal intensity have been used to determine the apparent location of the radiation source. Surprisingly the source extension seems to be limited in this case. This could be due to the current solar wind behaviour. The interplanetary magnetic field direction and the solar wind density were indeed varying abruptly.

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