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| Titel |
Properties of electron flux spectra around the plasmapause in the chorus and hiss regions using POES. |
| VerfasserIn |
Ian Whittaker, Craig Rodger, Mark Clilverd |
| 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 |
250090339
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| Publikation (Nr.) |
 EGU/EGU2014-4568.pdf |
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| Zusammenfassung |
| The European FP7 PLASMON project aims to provide observations of plasmaspheric
densities, and link the plasmaspheric variations to relativistic electron precipitation from the
radiation belts. This is intended to assist in the estimation and prevent damage of space assets
from space weather events as well as to improve forecasting (http://plasmon.elte.hu). As part
of the PLASMON project, electron fluxes from the POES series of satellites are being used to
determine the link between energetic electron precipitation energy spectra and magnitude to
the position of the plasmapause.
The MEPED instrument onboard POES measures electron flux from 90° (trapped particles)
and 0° (losscone) telescopes, in 3 integral energy channels (>30, >100 and >300 keV).
These fluxes have been compared to the DEMETER/IDP instrument to confirm that
published geometric factor corrections (Yando et al. 2011) can be accurately applied to the
POES data to produce as accurate as possible fluxes. These global fluxes have then been
separated into regions in which Chorus (23:00-11:00 MLT) and Hiss (11:00-16:00 MLT)
whistler mode waves are expected to occur, in 0.2 L-shell bins with a 20 minute temporal
resolution. The plasmapause locations have been determined from the O’Brien and
Moldwin (2003) models based on Kp, Ae and Dst peaks. We are currently comparing
the POES spectral gradient and flux magnitude with plasmapause location and
geomagnetic activity for the locations in which chorus and hiss are known to occur. This
presentation will focus on the electron flux spectral gradient behaviour either side of the
plasmapause, a value that is difficult to measure from ground based techniques. |
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