HR: 1330h
AN: SH42C-0547    [PDF]
TI: Radiations at Twice the Plasma Frequency Detected Upstream of the Earth's Shock by the CLUSTER/WHISPER Sounder
AU: * Trotignon, J
EM: jgtrotig@cnrs-orleans.fr
AF: LPCE/CNRS, Universite d'Orleans, 3A, avenue de la Recherche Scientifique, Orleans cedex 02, F-45071 France
AU: Decreau, P M
EM: pdecreau@cnrs-orleans.fr
AF: LPCE/CNRS, Universite d'Orleans, 3A, avenue de la Recherche Scientifique, Orleans cedex 02, F-45071 France
AU: Randriamboarison, O
EM: randriam@cnrs-orleans.fr
AF: LPCE/CNRS, Universite d'Orleans, 3A, avenue de la Recherche Scientifique, Orleans cedex 02, F-45071 France
AU: Rauch, J
EM: jlrauch@cnrs-orleans.fr
AF: LPCE/CNRS, Universite d'Orleans, 3A, avenue de la Recherche Scientifique, Orleans cedex 02, F-45071 France
AU: Canu, P
EM: canu@cetp.ipsl.fr
AF: CETP/CNRS, Universite Versailles Saint-Quentin-en-Yvelines, 10/12 avenue de l'Europe, Velizy, F-78140 France
AU: Darrouzet, F
EM: Fabien.Darrouzet@oma.be
AF: Institut d'Aeronomie Spatiale de Belgique, IASB, 3 avenue Circulaire, Bruxelles, B-1180 Belgium
AU: Eastwood, J P
EM: j.p.eastwood@ic.ac.uk
AF: The Blackett Laboratory, Space and Atmospheric Physics Group, Prince Consort Road, London, SW7 2BW United Kingdom
AU: Travnicek, P
EM: trav@Alenka.ufa.cas.cz
AF: Institute of Atmospheric Physics, Czech Acad. Sci., Bocni II - 1401, Prague, 141 31 Czech Republic
AB: 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.
DE: 2154 Planetary bow shocks
DE: 2159 Plasma waves and turbulence
DE: 2784 Solar wind/magnetosphere interactions
DE: 7500 SOLAR PHYSICS, ASTROPHYSICS, AND ASTRONOMY
DE: 7599 General or miscellaneous
SC: SPA - Solar and Heliospheric Physics [SH]
MN: 2003 Fall Meeting