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Title: A comparison of empirical and experimental O7+, O8+, and O/H values, with applications to terrestrial solar wind charge exchange
Authors: Whittaker, Ian C.
Sembay, Steve
First Published: 22-Jul-2016
Publisher: American Geophysical Union (AGU), Wiley
Citation: Geophysical Research Letters, 2016, 43 (14), pp. 7328-7337 (10)
Abstract: 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.
DOI Link: 10.1002/2016GL069914
ISSN: 0094-8276
eISSN: 1944-8007
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Creative Commons “Attribution Non-Commercial No Derivatives” licence CC BY-NC-ND, further details of which can be found via the following link: Archived with reference to SHERPA/RoMEO and publisher website.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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