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| Titel |
Relativistic electron precipitation during geomagnetic storm time in the years 2006-2010 |
| VerfasserIn |
Linn-Kristine Glesnes Ødegaard, Hilde Nesse Tyssøy, Marit Irene Sandanger, Johan Stadsnes, Finn Søraas |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250111006
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| Publikation (Nr.) |
 EGU/EGU2015-11067.pdf |
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| Zusammenfassung |
| The processes leading to acceleration or loss of relativistic electrons in the magnetosphere
during geomagnetic storm time have yet to be fully understood, and whether a geomagnetic
storm will lead to enhanced or depleted fluxes of relativistic electrons can not be known in
advance. Relativistic Electron Precipitation (REP) can penetrate deep into the atmosphere and
influence composition and dynamics. To study the effect of REP upon the atmosphere, the
energy and intensity of the electrons need to be accurately represented. We use satellite
measurements of electrons with energies E>300 keV and E>1000 keV to study the
behaviour of these electron populations during geomagnetic storms. We use the MEPED
detectors on board the POES satellites NOAA-17, NOAA-18, MetOp-02 and NOAA-19,
where the vertical telescope measures precipitated flux, and the horizontal telescope
trapped flux at satellite altitude (ca 850 km). Using a newly developed technique, we
can derive the flux of electrons depositing their energy in the atmosphere from the
pair of detectors on each satellite. 75 isolated storms were identified in the period
2006-2010. The storms include both typical CME driven storms, and weak long
duration storms driven by CIRs. Each storm was divided into pre-storm phase,
main phase and recovery phase, and the flux of relativistic electrons was monitored
through the storms. By combining the measurements from several satellites, we obtain
a close to global view of the relativistic electron fluxes, enabling us to study the
relationship between the REP and different geomagnetic indices and solar wind drivers. |
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