Physics
Scientific paper
Mar 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29e...2c&link_type=abstract
Geophysical Research Letters, Volume 29, Issue 5, pp. 2-1, CiteID 1058, DOI 10.1029/2001GL013988
Physics
1
Magnetospheric Physics: Magnetosphere/Ionosphere Interactions, Magnetospheric Physics: Magnetosphere-Inner, Magnetospheric Physics: Ring Current, Magnetospheric Physics: Storms And Substorms
Scientific paper
O+1 and N+1 are important ring current ions in great magnetic storms. We study ~10-210 keV/e O+1 and N+1 in dayside outer ring current (ORC) at ~9-15 RE using Geotail's EPIC/STICS ion spectrometer. We find: average N+1/O+1 (ΓN/O) varies by ~2 over a solar cycle, ~40% (~20%) at solar minimum (maximum); individual ΓN/O values range from ~0.15 (moderate solar maximum storm) to ~1 (18-hr solar minimum superquiet interval); and N+1 is third in importance after H+ and O+1 during two moderate storms (Dstmin ~ -80 nT, ~25% great storm intensity), one at minimum, one maximum. High-latitude topside ionospheric AE-D/MIMS ion composition data form a baseline reference used to argue that ORC ΓN/O variations generally reflect and may be partially explained by topside ionospheric density ΓN/O spatial variations.
Christon Stephen P.
Eastman Timothy E.
Gloeckler George
Lui Anthony Tat Yin
Mall Ulrich
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