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Chorus source locations from VLF Poynting flux measurements with the Polar spacecraft
Author(s) -
LeDocq M. J.,
Gurnett D. A.,
Hospodarsky G. B.
Publication year - 1998
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/1998gl900071
Subject(s) - chorus , poynting vector , equator , physics , geophysics , latitude , flux (metallurgy) , magnetic field , magnetosphere , polar , whistler , spacecraft , computational physics , astrophysics , geology , astronomy , art , materials science , literature , quantum mechanics , metallurgy
Previous studies have used indirect evidence to argue that whistler‐mode chorus emissions are generated near the magnetic equator. In this paper a spatial survey of wave normals and Poynting vectors computed from three‐component electric and magnetic field measurements is used to show that chorus is generated very close to the magnetic equator. One surprising result is that there are almost no chorus emissions propagating toward the magnetic equator, such as might be expected from high‐latitude magnetospheric reflections. The absence of a reflected component indicates that the chorus is reabsorbed, probably by Landau damping, before returning to the magnetic equatorial plane.