Swarm SCARF equatorial electric field inversion chain

The day-time eastward equatorial electric field (EEF) in the ionospheric E -region plays a crucial role in equatorial ionospheric dynamics. It is responsible for driving the equatorial electrojet (EEJ) current system, equatorial vertical ion drifts, and the equatorial ionization anomaly (EIA). Due t...

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Veröffentlicht in:Earth, planets, and space Jg. 65; H. 11; S. 1309 - 1317
Hauptverfasser: Alken, Patrick, Maus, Stefan, Vigneron, Pierre, Sirol, Olivier, Hulot, Gauthier
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Berlin/Heidelberg Springer Berlin Heidelberg 01.01.2013
Springer Nature B.V
Springer / Terra Scientific Publishing Company
Schlagworte:
Earth and Environmental Science
Earth Sciences
Electric fields
Geology
Geomagnetic field
Geophysics
Geophysics/Geodesy
Ionization
Ionosphere
Latitude
Sciences of the Universe
Swarm
electric fields
space magnetometry
Equatorial ionosphere
ISSN:1343-8832, 1880-5981
Online-Zugang:Volltext
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Zusammenfassung:The day-time eastward equatorial electric field (EEF) in the ionospheric E -region plays a crucial role in equatorial ionospheric dynamics. It is responsible for driving the equatorial electrojet (EEJ) current system, equatorial vertical ion drifts, and the equatorial ionization anomaly (EIA). Due to its importance, there is much interest in accurately measuring and modeling the EEF for both climatological and near real-time studies. The Swarm satellite mission offers a unique opportunity to estimate the equatorial electric field from measurements of the geomagnetic field. Due to the near-polar orbits of each satellite, the on-board magnetometers record a full profile in latitude of the ionospheric current signatures at satellite altitude. These latitudinal magnetic profiles are then modeled using a first principles approach with empirical climatological inputs specifying the state of the ionosphere. Since the EEF is the primary driver of the low-latitude ionospheric current system, the observed magnetic measurements can then be inverted for the EEF. This paper details the algorithm for recovering the EEF from Swarm geomagnetic field measurements. The equatorial electric field estimates are an official Swarm level-2 product developed within the Swarm SCARF (Satellite Constellation Application Research Facility). They will be made freely available by ESA after the commissioning phase.
Bibliographie:SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 14
ISSN:1343-8832
1880-5981
DOI:10.5047/eps.2013.09.008