Ionospheric plasma response to HF radio waves operating at frequencies close to the third harmonic of the electron gyrofrequency

Details Ionospheric plasma response to HF radio waves operating at frequencies close to the third harmonic of the electron gyrofrequency Ionospheric plasma response to HF radio waves operating at frequencies close to the third harmonic of the electron gyrofrequency

Nov 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jgr...10021489h&link_type=abstract

Journal of Geophysical Research, Volume 100, Issue A11, p. 21489-21502

Physics

23

Ionosphere: Active Experiments

Scientific paper

Experimental results concerning European incoherent scatter observations of heater-induced electron temperature enhancements, anomalous absorption of low-power HF probe waves, and the spectrum of stimulated electromagnetic emission (SEE) in the sidebands of a high-power HF electromagnetic wave are presented. For the experiments reported in this paper, an O mode pump wave was transmitted vertically into the F region above Tromsø, Norway, while the injected frequency was varied in small steps around the third harmonic of the electron gyrofrequency. Systematic variations with pump frequency were observed in the data obtained from all three diagnostics. Measurements of anomalous absorption, the downshifted maximum (DM) spectral feature, and heater-induced electron temperature enhancements all exhibited broad minima as the heater frequency approached the third harmonic of the electron gyrofrequency. In addition, the signal strength of the HF probe wave measured during heater off periods is also reduced at these and higher heater frequencies. The experimental findings suggest that at heater frequencies in the vicinity of the third gyroharmonic, small-scale field-aligned irregularities are not excited, whereas very small scale irregularities, of the order of a few electron cyclotron radii, which are responsible for the production of fast electrons, may be generated. The observed reduction in the diagnostic signal strength is then attributed to the ionized patches produced by these energetic electrons.

Affiliated with

Also associated with

No associations

Rating

Ionospheric plasma response to HF radio waves operating at frequencies close to the third harmonic of the electron gyrofrequency does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Ionospheric plasma response to HF radio waves operating at frequencies close to the third harmonic of the electron gyrofrequency, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ionospheric plasma response to HF radio waves operating at frequencies close to the third harmonic of the electron gyrofrequency will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1181480