Physics
Scientific paper
Sep 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....9210053e&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Sept. 1, 1987, p. 10,053-10,062. NSF-supported research.
Physics
57
Earth Atmosphere, Earth Magnetosphere, Geomagnetic Micropulsations, Interplanetary Magnetic Fields, Solar Wind, Geophysical Satellites, Harmonic Oscillation, Magnetohydrodynamics
Scientific paper
The equatorially orbiting Active Magnetospheric Particle Tracer Explorers CCE and IRM satellites have made numerous observations of Pc 3-4 magnetic field pulsations (10-s to 100-s period) simultaneously at locations upstream of the earth's bow shock and inside the magnetosphere. These observations show solar wind/IMF control of two categories of dayside magnetospheric pulsations. Harmonically structured, azimuthally polarized pulsations are commonly observed from L = 4 to 9 in association with upstream waves. More monochromatic compressional pulsations are clearly evident on occasion, with periods identical to those observed simultaneously in the solar wind. The observations reported here are consistent with a high-latitude (cusp) entry mechanism for wave energy related to harmonically structured pulsations.
Acuña Mario Humberto
Baumjohann Wolfgang
Engebretson Mark J.
Luehr Herman
Potemra Thomas A.
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