Field-aligned currents during IMF~0

Details Field-aligned currents during IMF~0 Field-aligned currents during IMF~0

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.3055p&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 15, p. 3055-3058

Physics

8

Ionosphere: Current Systems, Magnetospheric Physics: Current Systems, Magnetospheric Physics: Magnetosphere/Ionosphere Interactions, Magnetospheric Physics: Polar Cap Phenomena

Scientific paper

We report on field-aligned currents (FAC) obtained from precise magnetic field measurements made onboard the Ørsted and Magsat satellites when the interplanetary magnetic field (IMF) was near zero. We found that Region 1/Region 2 currents persist through southward IMF, IMF~0, and northward IMF; also the central area of both the northern and southern polar caps is always filled with FACs, even during slightly southward IMF. A statistical distribution of the latter currents resembles the dayside NBZ system with the downward/upward currents at post-noon/pre-noon hours, discovered earlier from Magsat observations. We hypothesize that the quasi-viscous interaction of the solar wind with the magnetospheric lobes may cause a sunward convection of the lobes' field lines through the bunch's core, effectively mapping the FACs of NBZ-type down to the near-pole area.

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