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| Titel |
Global statistical evidence for chorus as the embryonic source of plasmaspheric hiss |
| VerfasserIn |
Nigel Meredith, Richard Horne, Jacob Bortnik, Richard Thorne, Lunjin Chen, Wen Li, Angélica Sicard-Piet |
| 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 |
250088145
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| Publikation (Nr.) |
 EGU/EGU2014-2225.pdf |
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| Zusammenfassung |
| The origin of plasmaspheric hiss, the electromagnetic emission responsible for the gap
between the inner and outer radiation belts, has been debated for over four decades. Recently
a new theory proposed that chorus, which is excited in the equatorial region outside the
plasmapause, can propagate to low altitudes on the dayside and evolve into plasmaspheric
hiss. Here we combine data from six satellites and show that chorus extends along the Earth’s
magnetic field to high latitudes in the pre-noon sector and, in the equatorial region, there is a
clear gap of the order 1-2 Earth radii between plasmaspheric hiss at L* < 4 and
chorus further out, consistent with ray tracing modeling from a chorus source. Our
observations confirm two of the key predictions of the new theory and provide the
first statistical evidence for chorus as the embryonic source of plasmaspheric hiss. |
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