Geographic and Seasonal Distribution of Ion Temperature and Density as Measured by CINDI from the C/NOFS Spacecraft

Details Geographic and Seasonal Distribution of Ion Temperature and Density as Measured by CINDI from the C/NOFS Spacecraft Geographic and Seasonal Distribution of Ion Temperature and Density as Measured by CINDI from the C/NOFS Spacecraft

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa31a1407c&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SA31A-1407

Physics

[2415] Ionosphere / Equatorial Ionosphere, [2437] Ionosphere / Ionospheric Dynamics, [2467] Ionosphere / Plasma Temperature And Density, [2481] Ionosphere / Topside Ionosphere

Scientific paper

Since the April 26, 2009 launch of C/NOFS, the Ion Velocity Meter (IVM) which is part of the CINDI instrument package has made over 15 months of in-situ measurements of plasma temperature, composition, density, and velocity in the 400-850 km altitude range of the equatorial ionosphere. This has coincided with a period of unusually low solar activity with F10.7 cm radio fluxes consistently under 70 sfu that has resulted in a cold (~600 K in the pre-dawn region) low-density ionosphere near the spacecraft’s 402 km perigee altitude and a low O+/H+ transition height. Due to the 13° inclination of the orbit the location of the perigee advances through all local times in about 66 days. This precession has allowed seasonal sampling of ionospheric temperature, density, and composition. The variation of these quantities will be presented as a function of magnetic latitude, longitude, and altitude. Preliminary results indicate that at 550 km altitude there is a local equatorial daytime minimum in ion temperature as a function of MLAT with higher temperatures in the summer hemisphere. Ion densities, however, demonstrate a positive gradient toward the winter hemisphere with over a factor of two difference in density between +10° and -10° MLAT. Equatorial ion temperatures show longitudinal variation with elevated temperatures in the 30°-90° longitude sector.

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