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| Titel |
Kinetic Turbulence in the Terrestrial Magnetosheath: Cluster Observations |
| VerfasserIn |
Shiyong Huang, Fouad Sahraoui, Xiaohua Deng, JianSen He, Zhigang Yuan, Meng Zhou, Ye Pang, Huishan Fu |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250095723
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| Publikation (Nr.) |
 EGU/EGU2014-11191.pdf |
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| Zusammenfassung |
| We present a first statistical study of subproton and electron scales turbulence in the terrestrial
magnetosheath using waveform data measured by the Cluster/STAFF Search Coil
Magnetometer (SCM) in the frequency range [1, 180] Hz. It is found that clear spectral
breaks exist near the electron scale, which separate two power-law like frequency bands
referred to as the dispersive and the electron dissipation ranges. The frequencies of the breaks
fb are shown to be well correlated with the electron gyroscale Ïe rather than with the electron
inertial length de. The distribution of the slopes below fb is found to be narrow and peaks
near -2.9, while that of the slopes above fb is found broader, peaks near -5.2 and has values
as low as -7.5. This is the first time that such steep power-law spectra are reported in space
plasma turbulence. These observations provide strong constraints on theoretical
modeling of kinetic turbulence and dissipation in collisionless magnetized plasmas. |
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