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| Titel |
Occurrence rate of magnetosonic equatorial noise emissions as a function of the McIlwain's parameter |
| VerfasserIn |
Z. Hrbáčková, O. Santolík, F. Nemec, N. Cornilleau-Wehrlin |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250060730
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| Zusammenfassung |
| We report results of a statistical analysis of equatorial noise (EN) emissions based on the data
set collected by the four Cluster spacecraft between January 2001 and December 2010. We
have investigated a large range of the McIlwain’s parameter from L-1 to L-12 thanks to the
change of orbital parameters of the Cluster mission. We have processed data from the
STAFF-SA instruments which analyze measurements of electric and magnetic field
fluctuations onboard and provide us with hermitian spectral matrices. We have used linear
polarization of magnetic field fluctuations as a selection criterion. Propagation in the vicinity
of the geomagnetic equator has been used as an additional criterion for recognition of EN.
We have identified more than 2000 events during the investigated time period. We
demonstrate that EN can occur at all the analyzed L-shells. However, the occurrence rate
at L-shells below 2.5 and above 7.0 is very low. We show that EN occurs in the
plasmasphere as well as outside of the plasmasphere but with a lower occurrence rate. |
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