Field-aligned currents in the dayside cusp and polar cap region during northward IMF

Details Field-aligned currents in the dayside cusp and polar cap region during northward IMF Field-aligned currents in the dayside cusp and polar cap region during northward IMF

Aug 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jgra..107.1188v&link_type=abstract

Journal of Geophysical Research (Space Physics), Volume 107, Issue A8, pp. SMP 18-1, CiteID 1188, DOI 10.1029/2001JA009162

Physics

10

Magnetospheric Physics: Magnetopause, Cusp, And Boundary Layers, Magnetospheric Physics: Current Systems (2409), Magnetospheric Physics: Polar Cap Phenomena, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Ionosphere: Polar Cap Ionosphere

Scientific paper

The field-aligned currents in the dayside cusp and polar cap region are examined using magnetic data from the low-altitude polar-orbiting satellite Ørsted. The study is confined to cases where the interplanetary magnetic field (IMF) has a steady northward component and to a rather narrow region spanning ~4 hours around magnetic noon. We examine individual passes using a maximum variance analysis method, and we complement, for a single event, with ground-based data from the Greenland meridian chain of magnetometers. We suggest that when an east-west component By of the IMF exists for positive IMF Bz, the two NBZ (northward Bz) field-aligned currents that prevail over the polar region rotate to form the two field-aligned currents equatorward and poleward of the east-west flowing ionospheric DPY current in the dayside. The high accuracy of the Ørsted data makes it possible to uncover details not previously described.

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