Excitation of periodic magnetic field oscillations in the ULF range by amplitude modulated HF waves

Details Excitation of periodic magnetic field oscillations in the ULF range by amplitude modulated HF waves Excitation of periodic magnetic field oscillations in the ULF range by amplitude modulated HF waves

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990angeo...8..765m&link_type=abstract

Annales Geophysicae (ISSN 0992-7689), vol. 8, Nov. 1990, p. 765-780.

Physics

11

Amplitude Modulation, Earth Ionosphere, Extremely Low Radio Frequencies, High Frequencies, Magnetic Flux, Space Plasmas, Geomagnetism, Ionospheric Drift, Ionospheric Electron Density, Ionospheric Heating, Periodic Variations

Scientific paper

High power HF radio waves radiated into the ionosphere strongly enhance the electron temperature. This electron heating can cause perturbations in the conductivity tensor via an enhancement of the collision frequency or the electron density, depending on the modulation frequency of the HF wave. The periodically altered conductivities result in an ac current that emits electromagnetic waves. Two experiments with modulation frequencies between 0.7 and 9 Hz, and one with frequencies of 1425 Hz, 1 Hz, and 8.33 mHz are studied in detail and compared with numerical calculations. It is found that ellipticity and orientation of the polarization ellipse of the measured magnetic wave field can be ascribed to the effects of the temperature and density modulation.

Affiliated with

Also associated with

No associations

Rating

Excitation of periodic magnetic field oscillations in the ULF range by amplitude modulated HF waves 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 Excitation of periodic magnetic field oscillations in the ULF range by amplitude modulated HF waves, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Excitation of periodic magnetic field oscillations in the ULF range by amplitude modulated HF waves will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-839269