HAL will be down for maintenance from Friday, June 10 at 4pm through Monday, June 13 at 9am. More information
Skip to Main content Skip to Navigation
Journal articles

Longitudinal and seasonal structure of the ionospheric equatorial electric field

Abstract : The daytime eastward equatorial electric field (EEF) in the ionospheric E-region plays an important 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. Due to its importance, there is much interest in accurately measuring and modeling the EEF. In this work we propose a method of estimating the EEF using CHAMP satellite-derived latitudinal current profiles of the daytime EEJ along with Δ H measurements from ground magnetometer stations. Magnetometer station pairs in both Africa and South America were used for this study to produce time series of electrojet current profiles. These current profiles were then inverted for estimates of the EEF by solving the governing electrostatic equations. We compare our results with the Ion Velocity Meter (IVM) instrument on board the Communication/Navigation Outage Forecasting System satellite. We find high correlations of about 80% with the IVM data; however, we also find a constant offset of about 0.3 mV/m between the two data sets in Africa. Further investigation is needed to determine its cause. We compare the EEF structure in Africa and South America and find differences which can be attributed to the effect of atmospheric nonmigrating tides. This technique can be extended to any pair of ground magnetometer stations which can capture the day-to-day strength of the EEJ.
Document type :
Journal articles
Complete list of metadata

https://hal-insu.archives-ouvertes.fr/insu-03581803
Contributor : Nathalie Pothier Connect in order to contact the contributor
Submitted on : Sunday, February 20, 2022 - 5:59:42 PM
Last modification on : Tuesday, February 22, 2022 - 3:36:01 AM
Long-term archiving on: : Saturday, May 21, 2022 - 6:16:49 PM

File

JGR Space Physics - 2013 - Alk...
Publisher files allowed on an open archive

Licence

Copyright

Identifiers

Citation

P. Alken, A. Chulliat, S. Maus. Longitudinal and seasonal structure of the ionospheric equatorial electric field. Journal of Geophysical Research Space Physics, American Geophysical Union/Wiley, 2013, 118, pp.1298-1305. ⟨10.1029/2012JA018314⟩. ⟨insu-03581803⟩

Share

Metrics

Record views

56

Files downloads

4