Publication Date:
2023-09-12
Description:
Plasmaspheric hiss is an electromagnetic wave mode that occurs ubiquitously in the high-density plasmasphere and contributes crucially to the dynamic behavior of the Earth’s Van Allen radiation belts. While plasmaspheric hiss is commonly considered to be a broadband emission with frequencies from ∼100 Hz to several kHz, here we report Van Allen Probes measurements of unambiguous banded signatures of plasmaspheric hiss, uniquely characterized by an upper band above ∼200 Hz, a lower band below ∼100 Hz and a power gap in between. In statistics, banded plasmaspheric hiss occurs with the probability ~8% in the postnoon sector within 2.5-5.0 Earth radii, showing strong dependence on geomagnetic and solar wind conditions. Based upon observations, this talk will also discuss the possible mechanism(s) that may account for the formation of banded hiss waves.
Language:
English
Type:
info:eu-repo/semantics/conferenceObject
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