Ionospheric Heating Analysis. HF Plasma Line Enhancements at Arecibo
Abstract
The non-linear enhancement of the plasma line was observed in January 1971 by Carlson, Gordon and Showen (JGR 1972). The enhancement spectrum includes: a strong narrow line displaced below the HF (5.62 MHz) by the frequency of the ion acoustic waves (f sub i) in the plasma (about 4 kHz); a broader line (about 30 kc width) and other weak lines near the HF; a line near (f sub i). Enhancements above thermal levels range above a factor of 10,000 and may be taken as verification of the HF excitation of parametric instabilities in the ionosphere. Significant time variations over scales of tens of microseconds through hours were seen. Upshifted and downshifted power dependence, and decay rates (of the order of msec). The O-mode (but not the X-mode) excitation of these enhancements is of significance to heating experiments.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1972
- Accession Number
- AD0744523
Entities
People
- Herbert C. Carlson
- Robert L. Showen
- William E. Gordon
Organizations
- Rice University