Physics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsm21a..08c&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #SM21A-08
Physics
2481 Topside Ionosphere, 2736 Magnetosphere/Ionosphere Interactions, 2778 Ring Current, 0335 Ion Chemistry Of The Atmosphere (2419, 2427), 2431 Ionosphere/Magnetosphere Interactions (2736)
Scientific paper
We use similar ion mass spectrometers on the AMPTE/CCE, Wind, and Geotail spacecraft to investigate the magnetic local time day-night variation of O+1 and N+1 flux in the few-to-hundreds of keV energy range, the appropriate energy range for near-ring-current measurements. The measurements were collected over similar portions of two consecutive solar cycles: storm-time ring current measurements from AMPTE/CCE in 1984-1989 and average measurements at ~9-15 Re in the near-Earth magnetosphere/outer ring current from Wind and Geotail in 1995-2001. We find during both solar cycles that average N+1/O+1 ratios are from ~30% to ~50% greater on the nightside than on the dayside. We compare our observed N+1/O+1 ratios to model values obtained from the International Reference Ionosphere (IRI-95) Model and find the observed magnetosphere and IRI model values to be similar in that both show: (a) N+1/O+1 is greater on the nightside than on the dayside, and (b) N+1/O+1 is greater during solar minimum conditions than solar maximum conditions (see, e.g., Christon et al. [2002], Mall et al. [2002]), demonstrating that these aspects of ionospheric outflow appear to map out to the ring current/near-Earth magnetosphere. However, the magnetospheric N+1/O+1 values are consistently higher than the IRI-95 model values, suggesting that N+1 is more important to the magnetosphere than previously shown. We discuss implications of these comparisons on interpreting geophysical processes such as ionospheric outflow, geomagnetic disruption, and high-altitude and magnetospheric acceleration scenarios using reference models and in-situ observations. Christon et al., Geophys. Res. Lett., 29, in press, 2002. Mall et al., Geophys. Res. Lett., 29, in press, 2002.
Christon Stephen P.
Greenspan Marian E.
Mall Ulrich
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