Solar wind dynamic pressure variations and possible ground signatures of flux transfer events

Details Solar wind dynamic pressure variations and possible ground signatures of flux transfer events Solar wind dynamic pressure variations and possible ground signatures of flux transfer events

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.1669s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Feb. 1, 1991, p. 1669-1683. Research supported by DOE.

Physics

39

Dynamic Pressure, Flux Transfer Events, Periodic Variations, Solar Terrestrial Interactions, Solar Wind, Atmospheric Boundary Layer, Auroras, Ionospheric Propagation, Magnetosheath

Scientific paper

The effects of a series of solar wind dynamic pressure pulses are followed through the solar wind, across the bow shock and magnetosheath, into the magnetosphere, and down to the dayside ionosphere. Each pressure pulse had an intrinsic solar wind origin, i.e., was not generated by processes occurring at the earth's bow shock. Both upstream and downstream of the earth's bow shock, the pulses were identified by depressed magnetic field strengths and enhanced plasma densities. The pulses compressed the magnetosheath and magnetosphere, causing satellites in the magnetosphere to briefly observe enhanced magnetic field strengths, and/or enter the low-latitude boundary layer or magnetosheath. Satellites already in the magnetosheath observed a brief burst of enhanced magnetosheath flow caused by the relative inward motion of magnetosheath flow patterns. Alfven and fast mode compressional waves propagated rapidly down to the polar ionosphere, where they produced transient ionospheric flows at latitudes equatorward of the convection reversal boundary. The flow patterns moved westward around the auroral oval.

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