Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 40, Issue 12, Pages 2891-2896Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/grl.50593
Keywords
plasmaspheric hiss; chorus
Categories
Funding
- NSF [AGS0840178]
- NASA [NNX11AR64G, NNX11AD75G]
- European Union [262468]
- Natural Environment Research Council
- NASA [NNX11AD75G, 148139] Funding Source: Federal RePORTER
- Div Atmospheric & Geospace Sciences
- Directorate For Geosciences [0840178] Funding Source: National Science Foundation
- Natural Environment Research Council [bas0100023] Funding Source: researchfish
- NERC [bas0100023] Funding Source: UKRI
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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 prenoon sector, and, in the equatorial region, there is a clear gap of the order of 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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