The Air Force Grant documented here directly resulted in the purchase of hardware eight VLF receivers. Five of these receivers have been deployed successfully and are operating regularly and reliably. The remaining are pending imminent deployment. The new receiver sites have enabled Stanford to jumpstart a fully-funded THY program, with funds from Stanford University and NASA, which will enable a great expansion of this network, and in addition, provides a ...
The overall objectives of this work are to: * Quantify the requirements for controlled precipitation of radiation belt particles in order to mitigate space particle effects * Address the issue of coupling of space based antennas to the surrounding magnetoplasma for use in system design * Determine radiated power from single transmitting element The completion of these goals requires the design of antenna-in-plasma codes which simulate the interaction of radiating ...
Different mechanisms by which VLF waves from ground-based sources modify the nighttime lower ionosphere (D-region) are discussed. One process by which the ionosphere is regularly disturbed involves the precipitation of short (40 keV) electrons out of the radiation belts in gyroresonant interactions with whistler waves launched by lightning discharges. A second process involves direct upward coupling of lightning electric fields to the lower ionosphere leading to intense electric fields and ...
High resolution measurements of subionospheric VLF/LF signals are now established as a powerful remote sensing tool for investigation of transient and localized ionospheric disturbances associated with atmospheric lightning discharges. Events usually consist of sudden (60 events/hr) was observed at Huntsville on the 48.5 kHz signal from Silver Creek, Nebraska, with amplitude changes of as much as 15 dB in individual events.
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