Physics
Scientific paper
Apr 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.2475s&link_type=abstract
Journal of Geophysical Research, vol. 86, Apr. 1, 1981, p. 2475-2479.
Physics
6
Lunar Environment, Magnetopause, Magnetosheath, Plasma Temperature, Solar Wind, Space Plasmas, Apollo 15 Flight, Cold Plasmas, Earth Magnetosphere, Energy Spectra, Flow Velocity, Geomagnetism, Ion Temperature, Least Squares Method, Magnetohydrodynamic Flow, Maxwell-Boltzmann Density Function, Proton Energy, Velocity Distribution
Scientific paper
Least squares Maxwellian fits have been made to data from the Apollo 15 suprathermal ion detector experiment (SIDE) during the moon's passage through the dusk magnetosheath. It is found that the data are best fit by superimposing two co-moving proton populations whose temperatures differ radically: kT roughly 10 eV and kT roughly 100 eV. This two-temperature distribution cannot be explained by alpha particles. The higher temperature population is typical of that expected for the fully shocked magnetosheath at lunar distances. The colder distribution could arise from cold plasma from within the magnetosphere brought up to magnetosheath flow speeds, but it is more probably due to unshocked solar wind.
Freeman Walter J.
Maher J. Jr. L.
Sanders G. D.
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