Estimation of global field aligned currents using the Iridium® system magnetometer data

Details Estimation of global field aligned currents using the Iridium® system magnetometer data Estimation of global field aligned currents using the Iridium® system magnetometer data

Jun 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.2165w&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 11, p. 2165-2168

Physics

29

Ionosphere: Auroral Ionosphere, Ionosphere: Instruments And Techniques, Magnetospheric Physics: Current Systems, Magnetospheric Physics: Magnetosphere/Ionosphere Interactions

Scientific paper

The Iridium® System satellite constellation consists of 66 satellites in circular, polar, 780 km altitude orbits in six equally spaced planes. Each satellite carries an engineering magnetometer which has sufficient resolution to sense the Birkeland currents. This paper presents a spherical harmonic fitting (SHF) technique for estimating field aligned currents (FACs) using the cross track component of the magnetic field measurements from the Iridium satellites. The SHF magnetic field perturbations along with Ampere's law are used to derive the global FACs from 40° MLAT to the pole in either hemisphere. Data for 10-11 UT, 23 August, 1999 were obtained from Iridium, Defense Meteorology Satellite Program (DMSP) F13 and the Ultraviolet Imager (UVI) onboard the POLAR satellite. The SHF data were evaluated along the DMSP F13 track. The range of east-west component, SHF magnetic perturbations from Iridium was (-530,465) nT compared with (-630,634) nT from DMSP F13. The derived upward FACs ranged from -0.8 to 0.9 μAm-2. Upward FACs were co-located with bright dayside UVI emissions.

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