Physics
Scientific paper
Aug 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3416101v&link_type=abstract
Geophysical Research Letters, Volume 34, Issue 16, CiteID L16101
Physics
Magnetospheric Physics: Field-Aligned Currents And Current Systems (2409), Geomagnetism And Paleomagnetism: Satellite Magnetics: Main Field, Crustal Field, External Field, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Interplanetary Physics: Interplanetary Magnetic Fields, Global Change: Solar Variability (7537)
Scientific paper
An analysis of the effect of the IMF B y on near-Earth low and mid-latitude magnetic disturbances is presented. In particular the contribution from field-aligned currents (FACs) connected to the polar regions is investigated. Based on statistically determined high-latitude FAC patterns for various Interplanetary Magnetic Field (IMF) directions, we estimate the FAC contribution to the mid- and low latitude magnetic disturbance and its dependence on the IMF. The estimated perturbations are compared with observations from the ground and from the low-altitude polar orbiting satellite Oersted. It is found that the long-distance effect of the high-latitude FACs constitute the major source to IMF B y and B z related magnetic east-west disturbances at mid- and low latitudes.
Christiansen Freddy
Moretto Therese
Olsen Nils
Vennerstrom Suzanne
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