Physics
Scientific paper
May 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jatp...50..455m&link_type=abstract
(EISCAT Scientific Association, International EISCAT Workshop, 3rd, Bad Lauterberg, Federal Republic of Germany, Mar. 23-27, 198
Physics
38
F Region, Ion Motion, Plasma Drift, Velocity Distribution, Eiscat Radar System (Europe), Incoherent Scatter Radar, Ionospheric Drift
Scientific paper
A study has been made of data taken with EISCAT using the Common Program CP-3-C (F-region meridian scan) which shows that regions of enhanced ion temperature (in excess of 3000 K at all three EISCAT stations) are found on most days when Kp exceeds 2 or 3, usually accompanied by ion drift velocities of more than 1 km/s. These periods are often accompanied by anisotropy of the ion temperature and abnormally low apparent electron temperature, consistent with the presence of a non-Maxwellian ion velocity distribution such as would result from large but not exceptional ion drifts. Data for a selected period have been fitted using theoretical ion velocity distributions based on the relaxation-collision model and assuming that the ion composition is 100 percent O(+). The results confirm the presence of non-Maxwellian distributions, but a detailed comparison with theory reveals some discrepancies, indicating that the analysis may need to be extended to include effects due to, for example, molecular ions and instabilities.
Moorcroft D. R.
Schlegel Kristian
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