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    Rights statement: An edited version of this paper was published by AGU. Copyright 2018 American Geophysical Union. Kimura, T., Hiraki, Y., Tao, C., Tsuchiya, F., Delamere, P. A., Yoshioka, K., et al. (2018). Response of Jupiter's aurora to plasma mass loading rate monitored by the Hisaki satellite during volcanic eruptions at Io. Journal of Geophysical Research: Space Physics, 123, 1885–1899. https://doi.org/10.1002/2017JA025029 To view the published open abstract, go to http://dx.doi.org and enter the DOI.

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Response of Jupiter's Aurora to Plasma Mass Loading Rate Monitored by the Hisaki Satellite During Volcanic Eruptions at Io

Research output: Contribution to journalJournal article

Published
  • T. Kimura
  • Y. Hiraki
  • C. Tao
  • F. Tsuchiya
  • P. A. Delamere
  • K. Yoshioka
  • G. Murakami
  • A. Yamazaki
  • H. Kita
  • S. V. Badman
  • K. Fukazawa
  • I. Yoshikawa
  • M. Fujimoto
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<mark>Journal publication date</mark>03/2018
<mark>Journal</mark>Journal of Geophysical Research: Space Physics
Issue number3
Volume123
Number of pages15
Pages (from-to)1885-1899
Publication statusPublished
Early online date27/02/18
Original languageEnglish

Abstract

The production and transport of plasma mass are essential processes in the dynamics of planetary magnetospheres. At Jupiter, it is hypothesized that Io's volcanic plasma carried out of the plasma torus is transported radially outward in the rotating magnetosphere and is recurrently ejected as plasmoid via tail reconnection. The plasmoid ejection is likely associated with particle energization, radial plasma flow, and transient auroral emissions. However, it has not been demonstrated that plasmoid ejection is sensitive to mass loading because of the lack of simultaneous observations of both processes. We report the response of plasmoid ejection to mass loading during large volcanic eruptions at Io in 2015. Response of the transient aurora to the mass loading rate was investigated based on a combination of Hisaki satellite monitoring and a newly developed analytic model. We found that the transient aurora frequently recurred at a 2-6day period in response to a mass loading increase from 0.3 to 0.5t/s. In general, the recurrence of the transient aurora was not significantly correlated with the solar wind, although there was an exceptional event with a maximum emission power of similar to 10TW after the solar wind shock arrival. The recurrence of plasmoid ejection requires the precondition that an amount comparable to the total mass of magnetosphere, similar to 1.5Mt, is accumulated in the magnetosphere. A plasmoid mass of more than 0.1Mt is necessary in case that the plasmoid ejection is the only process for mass release.

Bibliographic note

An edited version of this paper was published by AGU. Copyright 2018 American Geophysical Union. Kimura, T., Hiraki, Y., Tao, C., Tsuchiya, F., Delamere, P. A., Yoshioka, K., et al. (2018). Response of Jupiter's aurora to plasma mass loading rate monitored by the Hisaki satellite during volcanic eruptions at Io. Journal of Geophysical Research: Space Physics, 123, 1885–1899. https://doi.org/10.1002/2017JA025029 To view the published open abstract, go to http://dx.doi.org and enter the DOI.