Anomalous Radio-Frequency Emission at Electron Cyclotron Frequency in Partially Ionized Plasmas

Abstract

The anomalous emission at the electron cyclotron frequency in partially ionized plasmas was studied in the range of radio frequency below 1000 Mc/s. An anomalous emission was able to be observed when the detecting frequency f exceeded a critical frequency f_crit, which was in the range from 40 to 70 Mc/s, somewhat smaller than the collision frequency of plasma electrons. Another anomalous emission was observed when f was smaller than f_crit The anomalous second harmonic was observed, which resulted from a frequency multiplying of the anomalous cyclotron emission.