An analysis of Pioneer 9 low-frequency wave observations near interplanetary discontinuities
作者： F. L. Scarf , E. W. Greenstadt , J. H. Wolfe , D. S. Colburn
关键词: Shock wave 、 Shock (fluid dynamics) 、 Low frequency 、 Physics 、 Electric field 、 Plasma diagnostics 、 Solar wind 、 Plasma oscillation 、 Computational physics 、 Geophysics 、 Wave propagation 、 Earth-Surface Processes 、 Ecology (disciplines) 、 Earth and Planetary Sciences (miscellaneous) 、 Space and Planetary Science 、 Palaeontology 、 Forestry 、 Aquatic science 、 Atmospheric Science 、 Soil science 、 Geochemistry and Petrology 、 Oceanography 、 Water Science and Technology
摘要: The sector boundary of February 2, 1969, was unusually complex, and within a single 7-hour period the Pioneer 9 magnetometer plasma probe detected reverse shock, slow conventional fast shock. During this interval electron gyrofrequency ion frequency each varied by more than factor 10, low-frequency (broadband 400-Hz) electric field wave levels were high variable. We show that, near discontinuities, enhanced 400-Hz not generally associated with gradients or current layers, but elevated when density fell fairly well-defined window. This suggests that modes related to sound waves detected, observations are assessed in terms various theories for interplanetary generation.
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