Ion temperature and density relationships measured by CINDI from the C/NOFS spacecraft during solar minimum

Details Ion temperature and density relationships measured by CINDI from the C/NOFS spacecraft during solar minimum Ion temperature and density relationships measured by CINDI from the C/NOFS spacecraft during solar minimum

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jgra..11502313c&link_type=abstract

Journal of Geophysical Research, Volume 115, Issue A2, CiteID A02313

Physics

9

Ionosphere: Equatorial Ionosphere, Ionosphere: Plasma Temperature And Density, Ionosphere: Ion Chemistry And Composition (0335), Ionosphere: Topside Ionosphere, Ionosphere: Solar Radiation And Cosmic Ray Effects

Scientific paper

The Ion Velocity Meter (IVM), a part of the CINDI instrument package on board the C/NOFS spacecraft, makes in situ measurements of plasma temperature, composition, density, and velocity. The 16 April 2008 launch of C/NOFS coincided with the deepest solar minimum since the space age began with F10.7 cm radio fluxes in the 60-70 solar flux unit range. Because of the 13° inclination of the orbit the location of the perigee advances through all local times in about 66 days. This allows seasonal sampling of ionospheric temperature, density, and composition as a function of local time, magnetic latitude, and altitude. Measurements taken near the spacecraft's 402 km perigee altitude indicate an unusually cold low-density ionosphere with nighttime ion temperatures at the magnetic equator reaching as low as 600 K with an [O+]/[H+] ratio of 4 and maximum daytime temperatures of 1300 K. The O+ to H+ transition height is very low and at the highest altitudes measured H+ comprises over 75% of the ionospheric plasma at all local times. We compare average values of the measured parameters with those from the International Reference Ionosphere and with incoherent scatter radar measurements from Jicamarca.

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