On the direct identification of propagation modes for HF plasma waves

Details On the direct identification of propagation modes for HF plasma waves On the direct identification of propagation modes for HF plasma waves

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....9417049p&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Dec. 1, 1989, p. 17049-17062.

Other

3

High Frequencies, Plasma Waves, Polarization (Waves), Propagation Modes, Wave Propagation, Cold Plasmas, Collisionless Plasmas, Electric Fields, Estimators, Magnetic Fields

Scientific paper

The problem of interpreting the direct measurement of the polarization sense for HF plasma waves is examined for a cold and collisionless magnetoplasma when two propagation modes are simultaneously present. It is shown that two types of propagation estimators could be considered. The first, generally more sensitive to the quasi-parallel waves, consists of the determination of the signs of the imaginary parts of measured cross-spectra between two electric or two magnetic wave field components, both perpendicular to each other and to the earth's magnetic field. The second estimator, more sensitive to the quasi-perpendicular waves, is obtained by testing the values and of the ratio of the parallel to the perpendicular energy, in the electric and magnetic wave field components, against thresholds. Thresholds are defined for electric as well as for magnetic measurements. Their values are always much lower than one.

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