Final Report for The Pennsylvania State University Communications and Space Sciences Laboratory.

摘要

The broad research objective of this program has been to investigate unique concepts for generating ULF, ELF, and VLF using the ionosphere as the wireless antenna. The wireless Antenna or HF demodulation experiment was demonstrated in 1980 using the Arecibo observatory's heating facility. Modulation of the dynamo current system at that latitude was the major source for the wireless antenna. Some of the major experimental accomplishments are: Excellent quality of generated ELF and VLF signals. Determination of D-region electron density profiles at high latitudes for large sunspot numbers. Slow beam steering to examine the structure of the electrojet current system mapped down into the D-region. Determination of electrojet activity from ELF/VLF polarization characteristics. Created multiple VLF ionospheric sources (two-element VLF arrays). Fast beam steering - the painting technique; a potential method of increasing ELF power. Short range field measurements in Alaska with the Penn State Mobile Van. Demonstrated the stability of the current system to support bi-phase PSK and Quad-phase PSK to increase data rates. (JHD)