A statistical study on O+ flux in the dayside magnetosheath
- 1Swedish Institute of Space Physics, Kiruna, Sweden
- 2Department of Computer Science, Electrical and Space Engineering, Luleå University of Technology, Luleå, Sweden
- 3Division of Fluid and Experimental Mechanics, Luleå University of Technology, Luleå, Sweden
Abstract. 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.