Physics
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18..709f&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 18, April 1991, p. 709-712.
Physics
5
Auroral Electrojets, Auroral Spectroscopy, Harmonic Radiation, Ion Cyclotron Radiation, Radar Echoes, Ion Scattering, Molecular Ions, Nitric Oxide, Oxygen Ions, Random Noise, Signal Processing
Scientific paper
Certain analyses of Canadian radar studies of auroral electrojet echoes have apparently shown spectra with multiple ion cyclotron harmonic peaks. On the basis of these, it has been argued that ion cyclotron effects must be important for all echo types seen by VHF radars, not just type 3. This conclusion is rejected for two reasons: (1) at the altitude of auroral backscatter (about 100-120 km), the ion-neutral collision frequency is much higher than the gyrofrequency since ions are essentially unmagnetized; and (2) it is shown that the 'high resolution' signal processing algorithm employed does not distinguish between echoes with and without harmonic structure. With a simulation, it is shown that the algorithm itself can impose apparent quasi-harmonic structure onto the spectrum of random noise.
Farley Donald T.
Providakes James F.
Sahr John D.
No associations
LandOfFree
Ion cyclotron harmonics in auroral radar echoes - Real effect or analysis artifact? 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 Ion cyclotron harmonics in auroral radar echoes - Real effect or analysis artifact?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ion cyclotron harmonics in auroral radar echoes - Real effect or analysis artifact? will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1791484