Interplanetary Electric Field Control of Field-Aligned Currents: Polar Magnetometer Observations

Details Interplanetary Electric Field Control of Field-Aligned Currents: Polar Magnetometer Observations Interplanetary Electric Field Control of Field-Aligned Currents: Polar Magnetometer Observations

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..gp31c04f&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #GP31C-04

Physics

2708 Current Systems (2409), 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

ACE and Wind measurements of the solar wind velocity and interplanetary magnetic field have been used to calculate the interplanetary electric field during passages of the Polar spacecraft above the southern auroral oval. Periods of the quasi-steady interplanetary electric field have been identified when the Polar spacecraft was transiting the auroral and polar regions both just in front of the terminator above the lit ionosphere and just behind the terminator above the dark ionosphere. The east-west magnetic perturbation observed was then used as a measure of the local field-aligned current density and extrapolated to a common altitude. Independent of whether the interplanetary electric field (IEF) is from dawn to dusk or dusk to dawn a significant field-aligned current always exists. The magnitude of its perturbation field for dusk to dawn IEF is about 180 nT. For dawn to dusk IEF the magnetic perturbation is roughly proportional to the dawn-dusk component of the IEF. The strength of the field-aligned current does not depend on whether the ionosphere under the spacecraft is in sunlight or in darkness.

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