Mathematics – Probability
Scientific paper
Jan 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86...83g&link_type=abstract
Journal of Geophysical Research, vol. 86, Jan. 1, 1981, p. 83-89.
Mathematics
Probability
265
Auroral Zones, Ion Beams, Ion Distribution, Ionospheric Ion Density, Magnetic Storms, Conics, Geomagnetism, Ionospheric Currents, Magnetoactivity, Polar Caps, Satellite Observation
Scientific paper
The occurrence of upgoing flows of field-aligned beams and nonfield-aligned conics of auroral ions from the ionosphere is investigated. Ions of energies 90 eV to 3.9 keV were measured by the electrostatic analyzer on board the polar-orbiting S3-3 satellite at altitudes from 240 to 8040 km and various latitudes, local times and magnetic activity levels. Calculations of the probability distributions of beams and conics reveal that they are both common auroral phenomena, with occurrence frequencies dependent on magnetic activity. During quiet conditions (Kp less than 3) conical ion distributions are observed with constant frequency in altitude above 1000 km apparently associated with the daytime polar cusp, while ion beams have a maximum occurrence frequency in the premidnight sector and are observed primarily above 5000 km. During disturbed times, ion beams are a persistent phenomenon, mainly confined to the dusk sector, while conical distributions are observed uniformly in local time and increasing in altitude. Results of the investigation are consistent with previous studies, and may provide information relevant to the mechanisms of auroral ion acceleration.
Clarke Andrew
Croley D.
Fennell J.
Gorney David J.
Luhmann Janet
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