Satellite measurements of auroral alpha particles

Details Satellite measurements of auroral alpha particles Satellite measurements of auroral alpha particles

Dec 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974jgr....79.5167s&link_type=abstract

Journal of Geophysical Research, vol. 79, Dec. 1, 1974, p. 5167-5170. Research supported by the U.S. Defense Nuclear Agency

Physics

5

Alpha Particles, Auroral Zones, Helium Ions, Magnetic Storms, Night Sky, Satellite Observation, Southern Hemisphere, Adiabatic Conditions, Earth Magnetosphere, Magnetic Effects, Mass Spectroscopy, Solar Wind

Scientific paper

Energetic He(++) ions were observed precipitating into the night side auroral zone on a satellite pass over the Southern Hemisphere on May 16, 1972, during a magnetic storm. The He(++) spectrum was peaked near 1 keV/nucleon and was quite similar to that of the simultaneously observed protons when it was plotted vs velocity. The averaged alpha-to-proton ratio varied from 5.6 plus or minus 0.7% in a latitudinal interval centered at L equals 7.3 to 2.9 plus or minus 0.5% in an interval centered at L equals 5.0. It is concluded that the He(++) ions and protons originated in the solar wind and were acted upon within the magnetosphere by adiabatic processes and that no substantial electrostatic acceleration occurred.

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