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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/angeo-2019-96
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-2019-96
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: regular paper 16 Jul 2019

Submitted as: regular paper | 16 Jul 2019

Review status
This discussion paper is a preprint. A revision of the manuscript is under review for the journal Annales Geophysicae (ANGEO).

Estimation of westward auroral electrojet current with magnetometer chain data

Marina A. Evdokimova and Anatoli A. Petrukovich Marina A. Evdokimova and Anatoli A. Petrukovich
  • Space Research Institute of the Russian Academy of Sciences, Moscow, 117997, Russia

Abstract. We investigate one-dimensional models of westward substorm electrojet, using magnetic field observations along a meridian chain. We review two linear models of Kotikov et al. (1987) and Popov et al. (2001) with the large number of elementary currents at fixed positions. They can be applied to a magnetometer chain with many magnetic stations. A new nonlinear method with one current element is designed for the cases with small number of stations. We illustrate performance of these methods using data from IMAGE and Yamal Peninsula stations. Several corrective measures are proposed to account for unphysical solutions or local extrema of the optimized functions. We also advertize a generic maximum likelyhood approach to a problem, usable for any empiric model.

Marina A. Evdokimova and Anatoli A. Petrukovich
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Marina A. Evdokimova and Anatoli A. Petrukovich
Marina A. Evdokimova and Anatoli A. Petrukovich
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