Storm phase dependence of ion outflow: Statistical signatures obtained by IMAGE/LENA

Details Storm phase dependence of ion outflow: Statistical signatures obtained by IMAGE/LENA Storm phase dependence of ion outflow: Statistical signatures obtained by IMAGE/LENA

Sep 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3418106k&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 18, CiteID L18106

Physics

2

Magnetospheric Physics: Magnetosphere/Ionosphere Interactions (2431), Magnetospheric Physics: Magnetic Storms And Substorms (7954), Interplanetary Physics: Neutral Particles (7837), Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Ionosphere: Topside Ionosphere

Scientific paper

The low-energy neutral atom (LENA) imager on board the Imager for Magnetopause-to-Aurora Global Exploration (IMAGE) spacecraft can observe energetic neutral atoms (ENA) of 10 eV to a few keV generated by upflowing ions through charge exchange with the Earth's exosphere. Using IMAGE/LENA data, we statistically analyzed behaviors of the ion outflow in the main and recovery phases of the magnetic storms from June 2000 to December 2001. Results show that during the main phase, most of ENA emissions from the Earth's direction are accompanied by the solar wind dynamic pressure (P dy ) enhancements. For the recovery phase, there are no such tendencies. Instead, the ENA flux shows large values at the beginning of the recovery phase, and then decreases with the storm recovery. These results suggest that the dominant mechanism responsible for the ion outflow during the magnetic storms can be totally different between the two phases.

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