ANTENNA STUDY FOR Z-MODE SPACE RADIO PROGRAM
HARVARD COLL CAMBRIDGE MA MUSEUM OF COMPARATIVE ZOOLOGY
Pagination or Media Count:
The antenna system for the Z-mode study must not only act as a receptor for cosmic signals but must also be capable of measuring the local properties of the ionospheric medium. The measurement of the plasma parameters i.e., electron density N and collision frequency nu is complicated by the proximity of the operating frequency for the Z-mode to the cyclotron frequency. By operating sufficiently above the cyclotron frequency, the anisotropy in the medium may be neglected. The collision frequency, however, is too small to be measured when the operating frequency is elevated above the cyclotron frequency. A theory has been developed which allows the antenna to operate near the cyclotron frequency. A preliminary antenna study would aid in determining the validity of the theory. An alternative method is available for measuring N and nu near the cyclotron frequency. In this method only the receiving properties of the antenna are needed. Since alternative methods are available for determining the actual plasma parameters the new theory may be easily checked.
- Radiofrequency Wave Propagation
- Atmospheric Physics