Collision frequency measurements in the high-latitude E region with EISCAT
Article first published online: 7 DEC 2012
Copyright 1985 by the American Geophysical Union.
Volume 20, Issue 4, pages 785–793, July-August 1985
How to Cite
1985), Collision frequency measurements in the high-latitude E region with EISCAT, Radio Sci., 20(4), 785–793, doi:10.1029/RS020i004p00785., , and (
- Issue published online: 7 DEC 2012
- Article first published online: 7 DEC 2012
- Manuscript Accepted: 13 FEB 1985
- Manuscript Received: 1 NOV 1984
Measurements of the ion-neutral collision frequencies with the EISCAT UHF incoherent scatter radar in the high-latitude, lower E region (90–105 km) show that for a time period of 2 weeks (at the beginning of February 1984) under different geophysical conditions the collision frequencies change little and compare well with a model calculated from the CIRA (1972) neutral atmosphere. When the ion and electron temperatures are approximately equal, it is confirmed that the measured collision frequency is consistent with the induced dipole collision frequency and an atmosphere in static equilibrium. One event at another time where collision frequencies increase by a factor of 1.5–2 over a period of 1½ hr could be due to neutral density enhancements from the passage of a large-amplitude, long-period gravity wave.