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Modeling the magnetospheric X-ray emission from solar wind charge exchange with verification from XMM-Newton observations

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journal contribution
posted on 12.09.2016, 13:06 by Ian C. Whittaker, Steve Sembay, Jennifer A. Carter, Andrew M. Read, Steve E. Milan, Minna Palmroth
An MHD-based model of terrestrial solar wind charge exchange (SWCX) is created and compared to 19 case study observations in the 0.5–0.7 keV emission band taken from the European Photon Imaging Cameras on board XMM-Newton. This model incorporates the Global Unified Magnetosphere-Ionosphere Coupling Simulation-4 MHD code and produces an X-ray emission datacube from O⁷⁺ and O⁸⁺ emission lines around the Earth using in situ solar wind parameters as the model input. This study details the modeling process and shows that fixing the oxygen abundances to a constant value reduces the variance when comparing to the observations, at the cost of a small accuracy decrease in some cases. Using the ACE oxygen data returns a wide ranging accuracy, providing excellent correlation in a few cases and poor/anticorrelation in others. The sources of error for any user wishing to simulate terrestrial SWCX using an MHD model are described here and include mask position, hydrogen to oxygen ratio in the solar wind, and charge state abundances. A dawn-dusk asymmetry is also found, similar to the results of empirical modeling. Using constant oxygen parameters, magnitudes approximately double that of the observed count rates are returned. A high accuracy is determined between the model and observations when comparing the count rate difference between enhanced SWCX and quiescent periods.

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Citation

Journal of Geophysical Research: Space Physics, 2016, 121 (5), pp. 4158-4179

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomy

Version

VoR (Version of Record)

Published in

Journal of Geophysical Research: Space Physics

Publisher

American Geophysical Union (AGU)

issn

2169-9380

eissn

2169-9402

Acceptance date

26/02/2016

Copyright date

2016

Available date

12/09/2016

Publisher version

http://onlinelibrary.wiley.com/doi/10.1002/2015JA022292/abstract

Language

en

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