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A statistical study on O+ flux in the dayside magnetosheath

Author(s): R. Slapak | H. Nilsson | L. G. Westerberg

Journal: Annales Geophysicae
ISSN 0992-7689

Volume: 31;
Issue: 6;
Start page: 1005;
Date: 2013;
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Studies on terrestrial oxygen ion (O+) escape into the interplanetary space have considered a number of different escape paths. Recent observations however suggest a yet insufficiently investigated additional escape route for hot O+: along open magnetic field lines in the high altitude cusp and mantle. Here we present a statistical study on O+ flux in the high-latitude dayside magnetosheath. The O+ is generally seen relatively close to the magnetopause, consistent with observations of O+ flowing primarily tangentially to the magnetopause. We estimate the total escape flux in this region to be ~ 7 × 1024 s−1, implying this escape route to significantly contribute to the overall total O+ loss into interplanetary space.

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