Other
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm14b..05b&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SM14B-05
Other
2753 Numerical Modeling, 2772 Plasma Waves And Instabilities (2471), 2774 Radiation Belts, 6964 Radio Wave Propagation, 6984 Waves In Plasma (7867)
Scientific paper
Plasmaspheric hiss is an electromagnetic emission found ubiquitously within the plasmasphere, and other high density regions such as plasmaspheric drainage plumes. It has been known for some time that hiss is an important scattering (loss) mechanism for the high energy electrons that populate the Van Allen (radiation) belts, and lead to the radiation-belts" well-known two-zone structure. However, the origin of plasmaspheric hiss has been a hotly debated topic since its discovery, over four decades ago. The two leading theories are: (1) the evolution of lightning-generated, magnetospherically reflected whistler waves into the incoherent hiss band, and (2) the in-situ growth of wave energy due to cyclotron interactions with energetic particles. Both theories suffer from significant deficits and cannot explain all of the observed features of hiss. In the present work, we present a new theory: the evolution of ELF/VLF chorus waves into the hiss spectrum, and show on the basis of extensive ray tracing that chorus is able to leak into the plasmasphere, and reproduce the observed hiss bandwidth, day/night asymmetry, and wave normal angle distribution. The modeling work is compared against current and previous satellite observations.
Bortnik Jacob
Mansergh Thorne Richard
Meredith Nigel P.
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