Physics
Scientific paper
Mar 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978p%26ss...26..245l&link_type=abstract
Planetary and Space Science, vol. 26, Mar. 1978, p. 245-254. Research supported by the Norges Teknisk-Naturvitenskapelige Forsk
Physics
5
Arc Discharges, Atmospheric Electricity, Ion Cyclotron Radiation, Proton Precipitation, Satellite Observation, Geomagnetism, Magnetic Storms, Pitch (Inclination), Plasma Density, Plasmapause, Radar Detection, Ring Currents, Upper Atmosphere
Scientific paper
The paper presents low-altitude satellite observations of precipitated and locally mirroring protons during periods of ground-based SAR arc observations. The SAR arcs, located in the moderately anisotropic region well equatorward of the isotropic precipitation, are in a region with significantly enhanced proton pitch angle scattering and enhanced electron temperature. The enhanced pitch angle scattering of the protons results in prominent and highly localized peaks in the fluxes of locally mirroring protons above the smooth intensity profile usually observed in this region. The observations support the Cornwall et al. (1971) ion cyclotron wave heating theory for SAR arc formation. The expected H-beta intensity in the SAR arc region and the energy flux from precipitated protons above a few keV are estimated.
Lundblad J. A.
Soraas Finn
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