The theory of VLF Doppler signatures and their relation to magnetospheric density structure

Details The theory of VLF Doppler signatures and their relation to magnetospheric density structure The theory of VLF Doppler signatures and their relation to magnetospheric density structure

Jul 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81.3327e&link_type=abstract

Journal of Geophysical Research, vol. 81, July 1, 1976, p. 3327-3339.

Physics

Doppler Effect, Earth Magnetosphere, Electron Density (Concentration), Signal Transmission, Magnetic Disturbances, Magnetic Field Configurations, Ray Tracing, Spectral Signatures, Very Low Frequencies

Scientific paper

When signals from a ground-based VLF transmitter travel through the magnetosphere and arrive at a low-altitude satellite in the conjugate hemisphere, they may undergo a spectral distortion due to Doppler shift by the satellite velocity. The paper presents a VLF ray tracing study of published VLF Doppler data samples. It is shown that the density structure of the plasmasphere leaves its imprint or signature in the observed Doppler shift pattern. Large positive and negative Doppler shifts (about 100 Hz) are reproduced by a strong decreasing electron density gradient interacting with the magnetic field curvature gradient between L roughly 2 and L roughly 3. VLF Doppler signatures can detect whether short-scale gradients dominate the density structure or merely perturb the long-scale gradient. The ray path calculations also allow one to map the signals observed by the satellite back to their excitation point in the lower ionosphere and thus estimate the effective transmitter coverage in the excitation hemisphere.

Affiliated with

Also associated with

No associations

Rating

The theory of VLF Doppler signatures and their relation to magnetospheric density structure 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 The theory of VLF Doppler signatures and their relation to magnetospheric density structure, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The theory of VLF Doppler signatures and their relation to magnetospheric density structure will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-940222