We report first results from a unique experiment performed at the HIPAS ionospheric modification facility in conjunction with the Poker Flat incoherent scatter radar in Alaska. High-power radio waves at 2.85 MHz, which corresponds to the second electron gyro-harmonic at ~245 km altitude, were transmitted into the nighttime ionosphere. Clear evidence of F-region ionospheric electron temperature enhancements were found, for the first time at this pump frequency, maximizing when the pump frequency is close to the second gyro-harmonic and double resonance. This is consistent with previous pump-enhanced artificial optical observations. We estimate the plasma heating efficiency to be approximately double that for higher pump frequencies.
|Original language||English (US)|
|Number of pages||8|
|Journal||Journal of Atmospheric and Solar-Terrestrial Physics|
|State||Published - Dec 2009|
All Science Journal Classification (ASJC) codes
- Atmospheric Science
- Space and Planetary Science