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| Titel |
Global model of whistler mode chorus from multiple satellite observations |
| VerfasserIn |
Nigel Meredith, Richard Horne, Angélica Sicard-Piet, Daniel Boscher, Keith Yearby, Wen Li, Richard Thorne |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250080949
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| Zusammenfassung |
| Gyroresonant wave particle interactions with whistler mode chorus play a fundamental role in
the dynamics of the Earth’s radiation belts and inner magnetosphere, affecting both the
acceleration and loss of radiation belt electrons. Knowledge of the variability of chorus wave
power as a function of both spatial location and geomagnetic activity, required for the
computation of pitch angle and energy diffusion rates, is thus a critical input for global
radiation belt models. Here we present a global model of lower band (0.1fce < f < 0.5fce)
and upper band (0.5fce < f < fce) chorus, where fce is the local electron gyrofrequency,
using plasma wave data from DE1, CRRES, Cluster 1, Double Star TC1 and THEMIS,
extending the coverage and improving the statistics of existing models. The chorus
emissions extend from the plasmapause out to L* = 10 and are found to be largely
substorm dependent with the largest intensities being seen during active conditions.
Equatorial lower band chorus is strongest during active conditions with peak intensities
of the order 2000 pT2 in the region 4 < L* < 9 between 2300 and 1200 MLT.
Equatorial upper band chorus is both weaker and less extensive with peak intensities
of the order a few hundred pT2 during active conditions between 2300 and 1100
MLT from L* = 3 to L* = 7. Moving away from the equator mid-latitude chorus is
strongest in the lower band during active conditions with peak intensities of the
order 2000 pT2 in the region 4 < L* < 9 but is restricted to the dayside between
0700 and 1400 MLT. The results suggest that including wave particle interactions
beyond geostationary orbit could be very important for global radiation belt models. |
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