Density modulated whistler mode emissions observed near the plasmapause -: art. no. 1975

被引:86
|
作者
Moullard, O
Masson, A
Laakso, H
Parrot, M
Décréau, P
Santolik, O
Andre, M
机构
[1] ESA, ESTEC, RSSD, NL-2201 AZ Noordwijk, Netherlands
[2] CNRS, LPCE, F-45071 Orleans, France
[3] Univ Orleans, Orleans, France
[4] Charles Univ, MFF, KEVF, CZ-18000 Prague, Czech Republic
[5] Swedish Inst Space, Uppsala Div, S-75121 Uppsala, Sweden
关键词
D O I
10.1029/2002GL015101
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
[1] Electron density fluctuations are regularly observed near the plasmapause together with electromagnetic waves below the electron cyclotron frequency (usually called hiss or chorus). Instruments on board CLUSTER spacecraft often observe two such emission bands with fluctuating wave intensities that suggest wave ducting in density enhancements as well as troughs. Near perigee the CLUSTER density measurements are usually limited to the electron density from 0.2 to 80 cm(-3). To establish a correlation between density and wave intensity deeper inside the outer plasmasphere, we extrapolate the electron density from the spacecraft potential after fitting a relationship between observed plasma frequency and spacecraft potential. During a plasmapause crossing on June 5, 2001 (near the geomagnetic equator, L = 4 - 6, afternoon sector), density fluctuations up to hundreds cm(-3) are found while whistler mode waves are observed in two separate frequency bands, at 100-500 Hz (correlated to the density fluctuations) and 3-6 kHz (anti-correlated).
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页数:4
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