Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm13a1182f&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SM13A-1182
Physics
2720 Energetic Particles, Trapped, 2730 Magnetosphere: Inner, 2778 Ring Current
Scientific paper
Based on the energetic particle measurement obtained by CRRES/MICS, ion composition variations in the ring current have been investigated. Observation shows that in addition to O+ and H+, N+ ions are also an important composition in the ring current region. The ratio of N+/O+ during geomagnetic quiet times is about 0.26, while a smaller valued could be found for strong active times. The variation of the ratio follows the same trace as the Dst index. Through a statistic study, it is demonstrated that the ratio of N+/O+ decreases with an enhanced geomagnetic activity for strong storms, whereas for small storms, there is no obvious correlations of the ratio to the activity level. Based on the IRI model, we show that different ion species reach their peak values at different altitude. The maximum of oxygen ions sit in a lower altitude than that of nitrogen ions. It is thus implied that the altitude of the ion up-flowing in the ionosphere is closely related to the geomagnetic activity. The stronger storms, the lower ionosphere could be involved in the magnetosphere-ionosphere coupling.
Fu Siqi
Liu Wende
Pu Zhang
Ruan Ping
Zong Qiugang
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