Precipitation of suprathermal ionospheric ions accelerated in the conjugate hemisphere

Details Precipitation of suprathermal ionospheric ions accelerated in the conjugate hemisphere Precipitation of suprathermal ionospheric ions accelerated in the conjugate hemisphere

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91.7006b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, June 1, 1986, p. 7006-7018. AN USSR-CNRS-supported research.

Computer Science

Sound

33

Ion Temperature, Ionospheric Composition, Ionospheric Ion Density, Particle Acceleration, Particle Precipitation, Atmospheric Density, Ionospheric Drift, Satellite Sounding

Scientific paper

Low-energy particle data from the Aureol 3 satellite were examined in order to characterize latitude-energy precipitation bands of low-energy ions (less than 3 keV) sometimes detected embedded in the discrete auroral regions. A clear energy dispersion is observed, the less energetic ions being observed equatorward of higher-energy precipitation. Generally the latitudinal extent of this structure is about Delta-Lambda approximately equal to 0.5 deg. Detailed ion energy spectra were used to infer that ionospheric ions are energized in the conjugate ionosphere, presumably in inverted-V structures, and undergo velocity-dependent electric drift effects during a single bounce. Model calculations and direct ion composition measurements clearly demonstrate that the H(+) ions are predominant in these structures. Furthermore in several cases a double energy band is observed associated with each side of the conjugate V-shaped electrostatic potential structure.

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