Hot oxygen corona at Europa

Andrew F. Nagy, Jhoon Kim, Thomas E. Cravens, Arvydas J. Kliore

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

A model of the hot oxygen exosphere at Europa was constructed. The source term for the hot atoms was assumed to be dissociative recombination of O2+ and Liouville's theorem was used to calculate their altitude distribution. It was found that near the surface the hot oxygen density is in excess of 200 cm-3, dropping to a value on the order of 50 cm-3 at 1500 km. These calculations indicate that the hot atomic oxygen densities are considerably less than the thermal molecular oxygen ones, but slightly larger than the measured sodium values. The escape flux of the hot oxygen atoms was calculated to be on the order of 1.4x108 atoms cm-2 sec-1. This corresponds to a global escape rate of 4.4x1025 atoms sec-1, which is more than an order of magnitude less than the estimated atmospheric sputtering rate.

Original languageEnglish
Pages (from-to)4153-4155
Number of pages3
JournalGeophysical Research Letters
Volume25
Issue number22
DOIs
Publication statusPublished - 1998 Nov 15

Fingerprint

Europa
coronas
corona
hot atoms
oxygen
escape
Liouville theorem
exosphere
atoms
oxygen atoms
sputtering
recombination
sodium

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

Cite this

Nagy, A. F., Kim, J., Cravens, T. E., & Kliore, A. J. (1998). Hot oxygen corona at Europa. Geophysical Research Letters, 25(22), 4153-4155. https://doi.org/10.1029/1998GL900139
Nagy, Andrew F. ; Kim, Jhoon ; Cravens, Thomas E. ; Kliore, Arvydas J. / Hot oxygen corona at Europa. In: Geophysical Research Letters. 1998 ; Vol. 25, No. 22. pp. 4153-4155.
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Nagy, AF, Kim, J, Cravens, TE & Kliore, AJ 1998, 'Hot oxygen corona at Europa', Geophysical Research Letters, vol. 25, no. 22, pp. 4153-4155. https://doi.org/10.1029/1998GL900139

Hot oxygen corona at Europa. / Nagy, Andrew F.; Kim, Jhoon; Cravens, Thomas E.; Kliore, Arvydas J.

In: Geophysical Research Letters, Vol. 25, No. 22, 15.11.1998, p. 4153-4155.

Research output: Contribution to journalArticle

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Nagy AF, Kim J, Cravens TE, Kliore AJ. Hot oxygen corona at Europa. Geophysical Research Letters. 1998 Nov 15;25(22):4153-4155. https://doi.org/10.1029/1998GL900139