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

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

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm21b0266k&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM21B-0266

Physics

2788 Magnetic Storms And Substorms (7954), 7954 Magnetic Storms (2788)

Scientific paper

A number of studies have shown that the ionospheric ion is one of the important sources of magnetospheric plasma. In particular, singly-charged oxygen ions, which are originated from the ionosphere, can be sometimes observed in large amounts in the magnetosphere. It is important to reveal the mechanism of ionospheric ion outflow and its effect on various phenomena in the magnetosphere. The Low Energy Neutral Atom (LENA) imager on board the IMAGE spacecraft can observe neutral atom emissions which are generated by upflowing ions through charge exchange with the Earth hydrogen exosphere. We can survey behaviors of the ionospheric ion outflow in a short time scale (< 1hour) by the LENA imager. In this study, we statistically analyzed IMAGE/LENA data from May 2000 to December 2001 to identify different behaviors of the ion outflow in the main and recovery phases of the magnetic storms. Results of analyses show that during the main phase, the neutral atom emission coming from the direction of the Earth often shows a sharp enhancement, and that most of these enhancements are accompanied with interplanetary shock waves. For the recovery phase, results show that there are few sharp enhancements in the neutral atom emission, and that the gradually decreasing variations of the emission intensity are correlated with the recovery of the storm which is represented by the SYM-H (DST) index. Detailed properties of the statistical relation between the decrease of the LENA emission and the storm recovery are presented, and the contribution of the ion outflows to the magnetosphere during the recovery phase will be discussed.

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