The effect of solar wind dynamic pressure changes on low and mid-latitude magnetic records

Details The effect of solar wind dynamic pressure changes on low and mid-latitude magnetic records The effect of solar wind dynamic pressure changes on low and mid-latitude magnetic records

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19.1227r&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 12, June 19, 1992, p. 1227-1230.

Physics

52

Dynamic Pressure, Ground Stations, Magnetopause, Polar Regions, Solar Terrestrial Interactions, Solar Wind, Auroras, Chapman-Ferraro Problem, Earth Magnetosphere, Interplanetary Magnetic Fields, Magnetometers, Midlatitude Atmosphere

Scientific paper

Magnetic records from low- and mid-latitude stations have been examined to determine their response to solar wind pressure changes. The best correlation between ground level changes and the change in the square root of the solar wind dynamic pressure occurs for stations at latitudes from 15 to 30 deg such as Tahiti, Honolulu, San Juan and Midway. The horizontal component of the field changes on average 16.5 nT for each change of 1(nPa) exp 1/2 of the square root of dynamic pressure. This is 50 percent greater than the vacuum model of Tsyganenko would predict for a nonconducting earth and therefore what would be expected for a perfectly conducting interior. Thus, low- and mid-latitude ground level response to solar wind pressure changes is dominated by the variation of the strength and location of the magnetopause current system and the corresponding induced currents within the earth rather than ionospheric current sources.

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