Identification of natural plasma emissions observed close to the plasmapause by the Cluster-Whisper relaxation sounder

被引:27
作者
Canu, P
Décréau, PME
Trotignon, JG
Rauch, JL
Seran, HC
Fergeau, P
Lévêque, M
Martin, P
Sené, RX
Le Guirriec, E
Alleyne, H
Yearby, K
机构
[1] UVSQ, CNRS, CETP, F-78140 Velizy Villacoublay, France
[2] Univ Orleans, F-45071 Orleans 2, France
[3] CNRS, LPCE, F-45071 Orleans 2, France
[4] Univ Sheffield, Sheffield S1 4DU, S Yorkshire, England
关键词
space plasma physics; active perturbation experiments; waves and instabilities; instrument and techniques;
D O I
10.5194/angeo-19-1697-2001
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We use the data collected by the Whisper instrument onboard the Cluster spacecraft for a first test of its capabilities in the identification of the natural plasma waves observed in the Earth's magnetosphere. The main signatures observed at the plasma frequency, upper hybrid frequency, and electron Bernstein modes were often difficult to be reliably recognized on previous missions. We use here the characteristic frequencies provided by the resonances triggered by the relaxation sounder of Whisper to identify with good confidence the various signatures detected in the complex wave spectra collected close to the plasmapause. Coupled with the good sensitivity, frequency and time resolution of Whisper, the resonances detected by the sounder allow one to precisely spot these natural emissions. This first analysis seems to confirm the interpretation of Geos observations: the natural emissions observed in Bernstein modes above the plasma frequency, now widely observed onboard Cluster, are not modeled by a single Maxwellian electrons distribution function. Therefore, multi-temperature electron distribution functions should be considered.
引用
收藏
页码:1697 / 1709
页数:13
相关论文
共 31 条
  • [1] LOW-LEVEL VLF AND LF RADIO EMISSIONS OBSERVED AT EARTH AND JUPITER
    BARBOSA, DD
    [J]. REVIEWS OF GEOPHYSICS, 1982, 20 (02) : 316 - 334
  • [3] BELMONT G, 1984, ESASP217 EUR SPAC AG, P701
  • [4] Observation of long-duration gyroharmonic resonances: A refutation of the short-duration explanation for interpreting the anomalous URAP sounder spectra observed in the Io torus
    Canu, P
    [J]. RADIO SCIENCE, 2001, 36 (01) : 171 - 181
  • [5] CANU P, 1984, ESA SP217 EUR SPAC A, P581
  • [6] GEOS-I - IDENTIFICATION OF NATURAL MAGNETOSPHERIC EMISSIONS
    CHRISTIANSEN, P
    GOUGH, P
    MARTELLI, G
    BLOCH, JJ
    CORNILLEAU, N
    ETCHETO, J
    GENDRIN, R
    JONES, D
    BEGHIN, C
    DECREAU, P
    [J]. NATURE, 1978, 272 (5655) : 682 - 686
  • [7] CHRISTIANSEN PJ, 1978, SPACE SCI REV, V22, P283
  • [8] CRAWFORD FW, 1964, RADIO SCI D, V69, P789
  • [9] DECREAU PME, 1987, ANN GEOPHYS A-UPPER, V5, P181
  • [10] Whisper, a resonance sounder and wave analyser: Performances and perspectives for the Cluster mission
    Decreau, PME
    Fergeau, P
    KrannoselsKikh, V
    Leveque, M
    Martin, P
    Randriamboarison, O
    Sene, FX
    Trotignon, JG
    Canu, P
    Mogensen, PB
    Vasiljevic, C
    Guyot, E
    Launay, L
    CornilleauWehrlin, N
    deFeraudy, H
    Iversen, I
    Gustafsson, G
    Gurnett, D
    Woolliscroft, L
    [J]. SPACE SCIENCE REVIEWS, 1997, 79 (1-2) : 157 - 193