Downward propagating ionization structures observed by UHF radar scattering of HF-enhanced ion-lines at the HAARP ionospheric-modification facility

B. J. Watkins, C. T. Fallen
2011 2011 XXXth URSI General Assembly and Scientific Symposium  
The MUIR UHF radar at the HAARP ionospheric modification facility has been operated in a number of experiments where the HF-enhanced ion-line has been used to monitor the ionospheric density variations. The altitude of the enhanced ion-line signals moves downward in response to increasing electron density variations that result from temperature-dependent ion chemistry, and for the special gyro-resonant case additional ionization is produced due to local electron acceleration near the altitude
more » ... near the altitude of the ion-line signals. The characteristics of these signals and their relation to optical emissions and model results will be presented.
doi:10.1109/ursigass.2011.6051131 fatcat:jtpkkpyhr5asnihavpiot4m6y4