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Weakening of Jupiter's main auroral emission during January 2014

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journal contribution
posted on 2016-04-19, 11:45 authored by S. V. Badman, B. Bonfond, M. Fujimoto, R. L. Gray, Y. Kasaba, S. Kasahara, T. Kimura, H. Melin, Jonathan D. Nichols, A. J. Steffl, C. Tao, F. Tsuchiya, A. Yamazaki, M. Yoneda, I. Yoshikawa, K. Yoshioka
In January 2014 Jupiter's FUV main auroral oval decreased its emitted power by 70% and shifted equatorward by ∼1°. Intense, low-latitude features were also detected. The decrease in emitted power is attributed to a decrease in auroral current density rather than electron energy. This could be caused by a decrease in the source electron density, an order of magnitude increase in the source electron thermal energy, or a combination of these. Both can be explained either by expansion of the magnetosphere or by an increase in the inward transport of hot plasma through the middle magnetosphere and its interchange with cold flux tubes moving outward. In the latter case the hot plasma could have increased the electron temperature in the source region and produced the intense, low-latitude features, while the increased cold plasma transport rate produced the shift of the main oval.

History

Citation

Geophysical Research Letters, 2016, 43 (3), pp. 988-997 (10)

Author affiliation

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

Version

  • VoR (Version of Record)

Published in

Geophysical Research Letters

Publisher

Wiley, American Geophysical Union (AGU)

issn

0094-8276

eissn

1944-8007

Acceptance date

2016-01-22

Copyright date

2016

Available date

2016-04-19

Publisher version

http://onlinelibrary.wiley.com/doi/10.1002/2015GL067366/abstract

Language

en