JpGU-AGU Joint Meeting 2017

Presentation information

[EE] Oral

P (Space and Planetary Sciences) » P-EM Solar-Terrestrial Sciences, Space Electromagnetism & Space Environment

[P-EM11] [EE] Mesosphere-Thermosphere-Ionosphere Coupling in the Earth's Atmosphere

Wed. May 24, 2017 9:00 AM - 10:30 AM A01 (Tokyo Bay Makuhari Hall)

convener:Loren Chang(Institute of Space Science, National Central University), Huixin Liu(Earth and Planetary Science Division, Kyushu University SERC, Kyushu University), Akinori Saito(Department of Geophysics, Graduate School of Science, Kyoto University), Tzu-Wei Fang, Chairperson:Loren Chang(Institute of Space Science, National Central University)

9:20 AM - 9:35 AM

[PEM11-07] Molecular Ion Up-flows and Hot Oxygen Atoms in Magnetosphere-Ionosphere-Thermosphere Coupling

*Andrew W Yau1, Victoria Foss1, Bernard D. Shizgal2 (1.University of Calgary, 2.University of British Columbia)

Keywords:magnetosphere, ionosphere, thermosphere, molecular ions, oxygen

The CASSIOPE Enhanced Polar Outflow Probe (e-POP) has been in operation since its launch into a polar orbit in September 2013. In the present study, we use the high-resolution in-situ data from e-POP to investigate a specific magnetosphere-ionosphere-thermosphere (MIC) coupling process: the acceleration and up-flows of molecular ions in the auroral ionosphere and the subsequent production of hot neutral oxygen atoms. Specifically, we present observations of enhanced molecular NO+ and possibly O2+ ion densities in the F-region and topside ionosphere (up to ~1000 km altitude), and density and temperature estimates of the hot oxygen atoms resulting from the dissociative recombination of the observed ions: we obtain these estimates by solving the Boltzmann equation for the collisional relaxation between the non-thermal nascent and ambient oxygen atoms, and compare them with previous observations and theoretical model predictions