Articles | Volume 27, issue 6
26 Jun 2009
 | 26 Jun 2009

F-region electron heating by X-mode radiowaves in underdense conditions

H. Löfås, N. Ivchenko, B. Gustavsson, T. B. Leyser, and M. T. Rietveld

Abstract. Observations of modifications of the electron temperature in the F-region produced by powerful high frequency radiowaves at 4.04 MHz transmitted in X-mode are presented. The experiments were performed during quiet nighttime conditions with low ionospheric densities so no reflections occurred. Electron temperature enhancements of the order of 300–400 K were obtained. Numerical simulation of ohmic heating by the pump wave reproduces both altitude profiles and temporal dependence of the temperature modifications in the experiments.