Physics
Scientific paper
Jun 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17..905l&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 17, June 1990, p. 905-908.
Physics
12
Bow Waves, Geomagnetic Pulsations, Interplanetary Magnetic Fields, Magnetospheric Instability, Solar Terrestrial Interactions, Solar Wind, Extremely Low Radio Frequencies, Magnetosheath, Very Low Frequencies
Scientific paper
Upstream waves have been postulated to be a major source of energy for the dayside magnetic pulsations within the magnetosphere. Thus, it is of interest to determine over what frequency range in the ion foreshock the power of fluctuations in the solar wind is enhanced. The magnetic field data from pairs of spacecraft, when they stay on either side of the ion foreshock boundary, were examined. It was found that the power of magnetic fluctuations is enhanced only at periods less than about two minutes, not at longer periods. Thus the upstream waves may contribute to Pc 3 and Pc 4 pulsations in the dayside magnetosphere, but they cannot be directly responsible for the longer-period waves.
Le Guan
Russell Christopher T.
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