Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa22a..05p&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SA22A-05
Physics
[2409] Ionosphere / Current Systems, [2427] Ionosphere / Ionosphere/Atmosphere Interactions, [3389] Atmospheric Processes / Tides And Planetary Waves
Scientific paper
Vector magnetometer observations from the CHAllenging Mini-satellite Payload (CHAMP) satellite are used to determine the solar quiet (Sq) current system during the recent solar minimum. Observations from 2006-2008 are combined and after removal of a main field model and accounting for field aligned currents, the longitudinal and seasonal variation of the Sq currents are determined. Comparison with Sq currents derived from ground-based magnetometers in the European/African longitude sector reveals similar amplitudes and seasonal variations, indicating that CHAMP observations can reliably determine the Sq current system. The seasonal variation is consistent with prior observations with the largest currents occurring around the equinoxes. Significant longitudinal variations are also observed and they exhibit seasonal variability. During Northern Hemisphere summer the predominant structure is a wave-1 feature. During the remainder of the year, wave-3 and wave-4 longitudinal structures dominate. Variations in tidal winds due to nonmigrating tides may influence the dynamo generated electric fields and currents, leading to the observed Sq current system longitudinal variations. The present study represents the first time that satellite magnetic field observations have been used to determine the Sq current system. Furthermore, the use of satellite observations allows for the first determination of the complete longitudinal variations of the Sq current system.
Forbes Jeffrey M.
Pedatella N. M.
Richmond Arthur D.
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