Computer Science – Sound
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa33b1635a&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SA33B-1635
Computer Science
Sound
2407 Auroral Ionosphere (2704), 2427 Ionosphere/Atmosphere Interactions (0335), 2431 Ionosphere/Magnetosphere Interactions (2736), 2463 Plasma Convection (2760)
Scientific paper
Measuring the temperature of ionospheric ions in situ is challenging because the temperatures involved (often < 0.1 eV) are comparable to or less than typical fluctuations in spacecraft potential and other sources of measurement noise. We demonstrate a new technique to determine Ti that is relatively immune to changes in spacecraft potential. Specifically, we construct two-dimensional maps of core ion distribution functions provided by Suprathermal Ion Imagers (SII) flown on the JOULE and JOULE-II sounding rockets. Ram flow in the plane of these images produces anisotropy that can be quantified and related through modeling to Mach number and therefore to thermal velocity and ion temperature. We provide examples from the ionospheric E region showing ion temperature enhancements that are a direct result of Joule heating at altitudes between 105-135 km.
Archer W.
Burchill J. K.
Knudsen David J.
Sangalli L.
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