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Electric fields and zonal winds in the equatorial ionosphere inferred from CHAMP satellite magnetic measurements
Author(s) -
Maus Stefan,
Alken Patrick,
Lühr Hermann
Publication year - 2007
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2007gl030859
Subject(s) - electrojet , equatorial electrojet , ionosphere , geophysics , equator , zonal and meridional , latitude , physics , geology , inversion (geology) , geodesy , current (fluid) , magnetic field , earth's magnetic field , atmospheric sciences , paleontology , quantum mechanics , structural basin , thermodynamics
The Equatorial Electrojet (EEJ) produces a strong magnetic signal in measurements of the low‐orbiting CHAMP satellite. Six years of data with more than 30,000 dayside equator crossings provide a unique data basis to study this current system. In addition to scalar measurements used in previous studies, we have also inverted vector magnetic field measurements to gain accurate meridional profiles of the eastward current in the equatorial region. By solving the relevant differential equation, the CHAMP‐derived current profiles can be inverted for the driving zonal electric fields and zonal winds. As a result of this feasibility study, we suggest an inversion of the complete set of individual CHAMP EEJ current profiles, which will provide valuable new information on dayside electric fields and thermospheric winds at low latitudes.