Ionospheric conductances and currents of a morning sector auroral arc from Swarm-A electric and magnetic field measurements

L. Juusola, W. E. Archer, K. Kauristie, J. K. Burchill, Heikki Antero Vanhamaki, A. T. Aikio

Research output: Contribution to journalArticle

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Abstract

We show the first ionospheric Hall and Pedersen conductances derived from Swarm magnetic and electric field measurements during a crossing of a morning sector auroral arc. Only Swarm-A was used, with assumptions of negligible azimuthal gradients and vanishing eastward electric field. We find upward field-aligned current, enhanced Hall and Pedersen conductances, and relatively weak electric field coincident with the arc. Poleward of the arc, the field-aligned current was downward, conductances lower, and the electric field enhanced. The arc was embedded in a westward electrojet, immediately equatorward of the peak current density. The equatorward portion of the electrojet could thus be considered conductance dominant and the poleward portion electric field dominant. Although the electric field measured by Swarm was intense, resulting in conductances lower than those typically reported, comparable electric fields have been observed earlier. These results demonstrate how Swarm data can significantly contribute to our understanding of the ionospheric electrodynamics.

Original languageEnglish
Pages (from-to)11,519-11,527
JournalGeophysical Research Letters
Volume43
Issue number22
DOIs
Publication statusPublished - Nov 28 2016

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auroral arcs
morning
ionospherics
electric field
sectors
magnetic field
electric fields
magnetic fields
electrojets
field aligned currents
electrojet
arcs
electrodynamics
density current
current density
gradients

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

Cite this

Juusola, L., Archer, W. E., Kauristie, K., Burchill, J. K., Vanhamaki, H. A., & Aikio, A. T. (2016). Ionospheric conductances and currents of a morning sector auroral arc from Swarm-A electric and magnetic field measurements. Geophysical Research Letters, 43(22), 11,519-11,527. https://doi.org/10.1002/2016GL070248

Ionospheric conductances and currents of a morning sector auroral arc from Swarm-A electric and magnetic field measurements. / Juusola, L.; Archer, W. E.; Kauristie, K.; Burchill, J. K.; Vanhamaki, Heikki Antero; Aikio, A. T.

In: Geophysical Research Letters, Vol. 43, No. 22, 28.11.2016, p. 11,519-11,527.

Research output: Contribution to journalArticle

Juusola, L, Archer, WE, Kauristie, K, Burchill, JK, Vanhamaki, HA & Aikio, AT 2016, 'Ionospheric conductances and currents of a morning sector auroral arc from Swarm-A electric and magnetic field measurements', Geophysical Research Letters, vol. 43, no. 22, pp. 11,519-11,527. https://doi.org/10.1002/2016GL070248
Juusola, L. ; Archer, W. E. ; Kauristie, K. ; Burchill, J. K. ; Vanhamaki, Heikki Antero ; Aikio, A. T. / Ionospheric conductances and currents of a morning sector auroral arc from Swarm-A electric and magnetic field measurements. In: Geophysical Research Letters. 2016 ; Vol. 43, No. 22. pp. 11,519-11,527.
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