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Average field-aligned current configuration parameterized by solar wind conditions

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journal contribution
posted on 16.02.2016, 10:55 by Jennifer. A. Carter, Stephen E. Milan, J. C. Coxon, M.-T. Walach, B. J. Anderson
We present the first large-scale comparison of the spatial distribution of field-aligned currents as measured by the Active Magnetosphere and Planetary Electrodynamics Response Experiment, with the location and brightness of the average auroral oval, determined from the Imager for Magnetopause-to-Aurora Global Exploration far ultraviolet instrument. These distributions are compared under the same interplanetary magnetic field magnitude and clock angle conditions. The field-aligned currents and auroral oval drop to lower latitudes, as the interplanetary magnetic field becomes both increasingly stronger in magnitude and increasingly southward. We find that the region 2 currents are more closely aligned with the distribution of auroral UV emission, whether that be in the discrete auroral zone about dusk or in the postmidnight diffuse aurora sector. The lack of coincidence between the region 1 field-aligned currents with the auroral oval in the dusk sector is contrary to expectation.

Funding

J.A.C. and S.E.M. gratefully acknowledge support from the STFC consolidated grant ST/K001000/1. J.C.C. was supported by NERC grant NE/L007177/1. M-T.W. was supported by a STFC studentship.

History

Citation

Journal of Geophysical Research: Space Physics (2016) 121

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomy

Version

VoR (Version of Record)

Published in

Journal of Geophysical Research: Space Physics (2016) 121

Publisher

American Geophysical Union (AGU), Wiley

issn

2169-9402

eissn

2169-9402

Acceptance date

20/01/2016

Copyright date

2016

Available date

16/02/2016

Publisher version

http://onlinelibrary.wiley.com/doi/10.1002/2015JA021567/full

Notes

Solar wind data were obtained from the NASA/GSFC OMNI facility (http://omniweb.gsfc.nasa.gov). AMPERE data were obtained from http://ampere.jhuapl.edu.

Language

en

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