| Issue |
J. Space Weather Space Clim.
Volume 15, 2025
Topical Issue - Swarm 10-Year Anniversary
|
|
|---|---|---|
| Article Number | 26 | |
| Number of page(s) | 11 | |
| DOI | https://doi.org/10.1051/swsc/2025022 | |
| Published online | 30 June 2025 | |
Technical Article
A climatological model of the equatorial electrojet based on Swarm satellite magnetic intensity observations
1
Division of Geomagnetism and Geospace, DTU Space, Technical University of Denmark, Centrifugevej 356, DK-2800 Kongens Lyngby, Denmark
2
Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, 216 UCB, Boulder, CO, USA
3
ESA–ESRIN, via Galileo Galilei 2, I-00044 Frascati, Italy
* Corresponding author: chiaradegeeter@live.be
Received:
20
November
2024
Accepted:
11
May
2025
The Equatorial Electrojet (EEJ) is a spatially localized electric current in the ionospheric dynamo region, flowing along the magnetic dip equator at an altitude of about 110 km, mainly on the dayside. Previous empirical models of the EEJ were based on magnetic intensity observations from the Ørsted, CHAMP, and SAC-C satellites. However, with the launch of the Swarm satellite trio in November 2013, a considerable amount of new data is available. We use latitudinal profiles of EEJ sheet current densities based on magnetic intensity measurements of the Swarm A and B satellites to construct a climatological model of the EEJ. This model describes sheet current density variations with local time, longitude, season, lunar phase, and the F10.7 solar flux. We validate our model with independent EEJ current density estimates from the Swarm C and CSES satellites.
Key words: Geomagnetism / Equatorial electrojet / Swarm satellites / Inverse problems
© N. Olsen et al., Published by EDP Sciences 2025
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