Physics – Plasma Physics
Scientific paper
Dec 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jhatd..11..239a&link_type=abstract
Johns Hopkins APL Technical Digest (ISSN 0270-5214), vol. 11, July-Dec. 1990, p. 239-254. Research supported by NASA, NSF, and U
Physics
Plasma Physics
1
Auroras, Earth Ionosphere, Earth Magnetosphere, Geomagnetic Pulsations, Solar Terrestrial Interactions, Solar Wind, Ampte (Satellites), Geosynchronous Orbits, Harmonic Oscillation, Ion Cyclotron Radiation, Magnetic Disturbances, Magnetic Fields, Spaceborne Experiments
Scientific paper
Spacecraft observations have shown that geomagnetic pulsations originating in magnetospheric processes, in spite of their small amplitude on the ground, have amplitudes in space relative to the local magnetic field of 5-10 percent and occasionally up to about 50 percent. It is noted that by studying geomagnetic pulsations, a detailed comparison can be made between plasma physics theory and observations that are not possible in laboratory experiments. Also geomagnetic pulsations play a role in magnetospheric dynamics and energy transport, and their study forms an integral part of enhancing the knowledge of the magnetosphere. The importance of spacecraft observations are discussed and attention is given to such topics as waves in the magnetosphere, field-line resonances, the quantitative analysis of a dipole field, plasma instabilities, and energy flow.
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