The magnetospheric response to 8-minute period strong-amplitude upstream pressure variations

Details The magnetospheric response to 8-minute period strong-amplitude upstream pressure variations The magnetospheric response to 8-minute period strong-amplitude upstream pressure variations

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mrmp.rept.....s&link_type=abstract

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Computer Science

Dynamic Pressure, Earth (Planet), Electron Precipitation, Interplanetary Magnetic Fields, Magnetic Flux, Magnetic Signatures, Magnetohydrodynamic Waves, Magnetospheric Ion Density, Oscillations, Radiation Pressure, Solar Wind, Polar Regions, Pressure Distribution, Pulses

Scientific paper

This report documents a series of brief, strong (Delta p/p = 1), dynamic pressure oscillations that occurred in the region upstream of the Earth's bow shock during a period of radial interplanetary magnetic field (IMF). The analyzed set of oscillations, which may be either intrinsic solar wind or bow shock-related phenomena, recur approximately every 8 to 10 minutes, and their magnetic field signatures occur nearly simultaneously over great distances transverse to the Earth-sun line. The pressure oscillations appear to drive tailward-moving magnetopause surface wavelets. In turn, the surface wavelets can be identified as hydromagnetic waves with strong compressional components in the outer magnetosphere and as quasi-periodic variations in electron precipitation and high-latitude ground pulsations. We use observations by spacecraft in the outer dayside magnetosphere to predict geosynchronous and subsolar magnetic field strengths, the location of the subsolar magnetopause, the solar wind dynamic pressure, and variations in the energetic magnetospheric ion flux.

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