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Weakening of Jupiter's main auroral emission during January 2014
Author(s) -
Badman S. V.,
Bonfond B.,
Fujimoto M.,
Gray R. L.,
Kasaba Y.,
Kasahara S.,
Kimura T.,
Melin H.,
Nichols J. D.,
Steffl A. J.,
Tao C.,
Tsuchiya F.,
Yamazaki A.,
Yoneda M.,
Yoshikawa I.,
Yoshioka K.
Publication year - 2016
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2015gl067366
Subject(s) - magnetosphere , jupiter (rocket family) , plasma , physics , electron density , flux (metallurgy) , electron temperature , low latitude , latitude , atmospheric sciences , electron , geophysics , ionosphere , astrophysics , astronomy , materials science , quantum mechanics , metallurgy , space shuttle
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.