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Communication Dans Un Congrès Année : 2010

Analysis of equatorial noise using data from the Cluster and Themis missions

Z. Hrbackova
  • Fonction : Auteur
O. Santolík
J. S. Pickett
  • Fonction : Auteur
D. A. Gurnett
  • Fonction : Auteur
Olivier Le Contel
Vratislav Krupar

Résumé

We report the results of the analysis of equatorial noise (EN) using data from the Cluster and Themis spacecraft missions. EN is an intense electromagnetic wave emission that propagates close to the geomagnetic equator between the local proton cyclotron and local lower hybrid frequencies. Recent studies have shown that these waves might play a significant role in the acceleration of electrons to relativistic energies in the outer Van Allen radiation belt. The orbit of the Cluster mission has changed over the last two years, providing us with a larger and statistically more meaningful database from which to carry out our study of EN occurrence. We use onboard analyzed data from the STAFF-SA instrument and high-time resolution waveform data from the WBD instrument collected between 2002 and 2009. We present the results obtained by a systematic analysis of the fine spectral structures of the EN emissions observed by WBD. The frequencies of emission peaks have been visually selected from high-resolution spectrograms. We show histograms of the positions of the source regions of EN. The five spacecraft of the Themis mission have search coil magnetometers onboard which measure wave fluctuations in the frequency bandwidth from 0.1 Hz to 4 kHz. We present the results of the fine spectral analysis of these measurements.
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Dates et versions

hal-02860525 , version 1 (08-06-2020)

Identifiants

  • HAL Id : hal-02860525 , version 1

Citer

Z. Hrbackova, O. Santolík, J. S. Pickett, D. A. Gurnett, Nicole Cornilleau-Wehrlin, et al.. Analysis of equatorial noise using data from the Cluster and Themis missions. 38th COSPAR Scientific Assembly, 2010, Bremen, Germany. pp.4040. ⟨hal-02860525⟩
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