Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990esasp.311...63s&link_type=abstract
In ESA, Plasma Astrophysics p 63-68 (SEE N91-15046 06-90)
Astronomy and Astrophysics
Astrophysics
Dynamic Response, Earth Ionosphere, Earth Magnetosphere, Electromagnetic Coupling, Solar Wind, Transient Pressures, Antarctic Regions, Geosynchronous Orbits, Magnetometers, Statistical Analysis
Scientific paper
Solar wind dynamic pressure variations are common and have large amplitudes. Existing models for the transient magnetospheric and ionospheric response to the solar wind dynamic pressure variation are quantified. The variations drive large amplitude (approx 1 RE) magnetopause motion with velocities of approx. 60 km/s and transient dayside ionospheric flows of 2 km/s which are organized into double convection vortices. Ground magnetometer signatures are more pronounced under the auroral ionosphere, where they reach 60 to 300 nT, and under the equatorial electrojet. A statistical comparison of transient ground magnetometer events seen at a South Pole station and geosynchronous orbit indicates that all but the weakest ground events are associated with clear compressional signatures at the dayside geosynchronous orbit.
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