Another unexpected origin of plasmaspheric hiss?

Details Another unexpected origin of plasmaspheric hiss? Another unexpected origin of plasmaspheric hiss?

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm43b..01m&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM43B-01

Other

2730 Magnetosphere: Inner, 2768 Plasmasphere, 2772 Plasma Waves And Instabilities (2471), 2774 Radiation Belts

Scientific paper

Plasmaspheric hiss is an electromagnetic emission confined to the plasmasphere and responsible for electron loss from the radiation belts, particularly in the slot region (2 < L < 3) but also inside plasmaspheric plumes, the outer radiation belt and the upper part of the inner belt during magnetically disturbed periods. Therefore, understanding the origin(s) of this whistler-mode propagating emission is of fundamental importance to forecast the distribution of relativistic electrons and the dynamics of the radiation belts. Recent studies have shown that chorus, another whistler-mode emission but generated just outside the plasmasphere, can propagate inside the plasmasphere and evolve into hiss [Santolík et al., 2005; Bortnik et al., 2008]. Other studies have shown that lightning-generated whistlers can account for the hiss wave power above 2 kHz [Green et al., 2005; Meredith et al., 2006]. As a reminder plasmaspheric hiss is a structureless emission, banded in frequency between ~100 Hz to several kHz and its power is on average one order of magnitude more intense below than above 1 kHz. Mid-latitude hiss is another type of whistler- mode emission found, like chorus, in the outskirts of the plasmasphere, with propagation characteristics similar to chorus as detected by the European Space Agency Cluster mission [Masson et al., 2004]. For the first time, ray-tracing calculations will be presented showing if this electromagnetic emission can also be regarded as an embryonic source of plasmaspheric hiss.

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