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| Titel |
Source location of chorus emissions observed by Cluster |
| VerfasserIn |
M. Parrot, O. Santolík, N. Cornilleau-Wehrlin, M. Maksimovic, C. C. Harvey |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 21, no. 2 ; Nr. 21, no. 2, S.473-480 |
| Datensatznummer |
250014569
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| Publikation (Nr.) |
 copernicus.org/angeo-21-473-2003.pdf |
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| Zusammenfassung |
One of the objectives of
the Cluster mission is to study sources of various electromagnetic waves using
the four satellites. This paper describes the methods we have applied to data
recorded from the STAFF spectrum analyser. This instrument provides the cross
spectral matrix of three magnetic and two electric field components. This
spectral matrix is analysed to determine, for each satellite, the direction of
the wave normal relative to the Earth’s magnetic field as a function of
frequency and of time. Due to the Cluster orbit, chorus emissions are often
observed close to perigee, and the data analysis determines the direction of
these waves. Three events observed during different levels of magnetic activity
are reported. It is shown that the component of the Poynting vector parallel to
the magnetic field changes its sense when the satellites cross the magnetic
equator, which indicates that the chorus waves propagate away from the equator.
Detailed analysis indicates that the source is located in close vicinity of the
plane of the geomagnetic equator.
Key words. Magnetospheric physics
(plasma waves and instabilities; storms and substorms); Space plasma physics
(waves and instabilities) |
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