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A comparison of empirical and experimental O7+, O8+, and O/H values, with applications to terrestrial solar wind charge exchange

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journal contribution
posted on 11.11.2016, 16:16 by Ian C. Whittaker, Steve Sembay
Solar wind charge exchange occurs at Earth between the neutral planetary exosphere and highly charged ions of the solar wind. The main challenge in predicting the resultant photon flux in the X-ray energy bands is due to the interaction efficiency, known as the α value. This study produces experimental α values at the Earth, for oxygen emission in the range of 0.5–0.7 keV. Thirteen years of data from the Advanced Composition Explorer are examined, comparing O7+ and O8+ abundances, as well as O/H to other solar wind parameters allowing all parameters in the Alpha [subscript O [subscript 7.8+]] calculation to be estimated based on solar wind velocity. Finally, a table is produced for a range of solar wind speeds giving average O7+ and O8+ abundances, O/H, and Alpha [subscript O [subscript 7.8+]] values.

Funding

This research used the SPECTRE High Performance Computing Facility at the University of Leicester. Effort sponsored by the Air Force Office of Scientific Research, Air Force Material Command, USAF, under grant FA9550-14-1-0200 is acknowledged. The U.S. government is authorized to reproduce and distribute reprints for Governmental purposes notwithstanding any copyright notation thereon.

History

Citation

Geophysical Research Letters, 2016, 43 (14), pp. 7328-7337 (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

American Geophysical Union (AGU), Wiley

issn

0094-8276

eissn

1944-8007

Acceptance date

29/06/2016

Available date

11/11/2016

Publisher version

http://onlinelibrary.wiley.com/doi/10.1002/2016GL069914/abstract

Language

en