Physics – Plasma Physics
Scientific paper
Apr 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981rspta.300..489d&link_type=abstract
(Royal Society, Discussion on High Temperature Plasma Physics and Its Applications, London, England, Apr. 16, 17, 1980.) Royal S
Physics
Plasma Physics
1
Magnetohydrodynamic Stability, Magnetospheric Proton Density, Plasma Diagnostics, Space Plasmas, Cyclotron Resonance, Field Aligned Currents, Magnetohydrodynamic Waves, Plasma Frequencies, Velocity Distribution
Scientific paper
The characteristics of the magnetospheric plasma are discussed. The scaling of laboratory plasma parameters with respect to the magnetospheric plasma is considered, and it is pointed out that whereas the size, characteristic times, field strengths and plasma frequencies scale regularly, the ratio of the collision frequency to any other frequency is reduced by a factor of ten million in the magnetosphere. The two-types of instabilities driven by magnetospheric protons, the cyclotron resonant instability and the Alfven mode, are examined, and the plasma sheet origin of the hot protons responsible for driving both instabilities is noted. The origin of the plasma sheet on the night side from which these hot protons come is then discussed, with attention given to the protons flowing towards and away from the earth parallel to the magnetic field and the field-aligned currents, which are associated with strong electrostatic noise.
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