Effect of solar wind variation on low-energy O+ populations in the magnetosphere during geomagnetic storms: FAST observations

Details Effect of solar wind variation on low-energy O+ populations in the magnetosphere during geomagnetic storms: FAST observations Effect of solar wind variation on low-energy O+ populations in the magnetosphere during geomagnetic storms: FAST observations

Apr 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jgra..11304220y&link_type=abstract

Journal of Geophysical Research, Volume 113, Issue A4, CiteID A04220

Physics

7

Magnetospheric Physics: Magnetosphere: Inner, Magnetospheric Physics: Ring Current, Magnetospheric Physics: Plasma Sheet, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Magnetospheric Physics: Magnetic Storms And Substorms (7954)

Scientific paper

The relationship between solar wind conditions and variations in low-energy (<28 keV) O+ ions during magnetic storms was investigated based on Fast Auroral Snapshot (FAST) observations. We selected four magnetic storms in 2000 using the following criteria: 1. the time profile of the Dst is simple (no multiple main phase), 2. the FAST orbit has a good coverage in the midnight and/or dusk side sector, and 3. middle-latitude (ILAT > 45°) particle data are available. For each orbit in the course of the four magnetic storms, the simultaneous solar wind data are compiled and the effects of each solar wind parameter such as the dynamic pressure, the dawn-dusk electric field, the velocity, and the density are investigated. The results indicate a strong correlation between the pressure and density of low-energy O+ ions in the ring current region and the storm intensity, which is consistent with previous studies on high-energy (>50 keV) O+ ions. The solar wind dynamic pressure also plays an important role in O+ pressure and density enhancement in the ring current and plasma sheet regions.

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