Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....97.2835p&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A3, March 1, 1992, p. 2835-2844. Research supported by NASA.
Physics
42
Earth Magnetosphere, Interplanetary Magnetic Fields, Polar Cusps, Satellite Observation, Solar Wind, Viking Spacecraft, Geomagnetism, High Temperature Plasmas, Magnetometers, Ring Currents
Scientific paper
Results of a study of satellite and ground-based data acquired near the dayside cusp during a period when the IMF was inferred to have a strong northward component are presented. The presence of Pc 1 bursts, Pc 4-5 pulsations, and a tailward traveling twin vortex pattern of ionospheric convection suggests that the magnetosphere may have been temporarily compressed. Magnetic field data acquired at a synchronous altitude from GOES 5 and on the ground from Huanacayo support this suggestion. Plasma with ion dispersion characteristics associated with a cusp during southward IMF was detected by Viking over a 3.5-deg range of latitude. The presence of standing Alfven waves and ring current ions suggests that this 'cusplike' plasma was observed on closed geomagnetic field lines. It is suggested that the magnetosphere, during a northward IMF, is temporarily compressed by a solar wind pressure enhancement that produces the Pc 1 bursts, Pc 4-5 pulsations, and ionospheric vortices.
Arnoldy Roger L.
Erlandson Robert E.
Friis-Christensen Eigil
Potemra Thomas A.
Woch Joachim
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