Very Low Frequency (VLF) Remote Sensing of Gravity Waves Generated by the Auroral Electrojet
Final technical rept. 1 Jun 1997-31 Dec 2000
STANFORD UNIV CA SPACE TELECOMMUNICATIONS AND RADIOSCIENCE LAB
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During the period of performance the VLF remote diagnostic technique was applied in order to characterize both the ambient and modified D-region when perturbed by atmospheric gravity waves generated by the auroral electrojet. The characterization involved VLF sub-ionospheric wave phase and amplitude measurements at four sites located in Alaska and four sites located along the east coast of the North American continent. A total often separate propagation paths were monitored. A large number of gravity wave events were captured that exhibited features consistent with impulsive generation by the auroral electrojet. Measured VLF sub-ionospheric wave amplitudes were pertured by as much as 3 dB by the gravity waves. The measured VLF wave amplitude and phase perturbations were consistent with a vertical displacement of the D-region driven by the gravity waves. We conclude that gravity waves excited by the auroral electrojet can have significant effects upon the amplitude and phase of sub-ionospheric VLF waves.
- Atmospheric Physics
- Radiofrequency Wave Propagation