Studies of the Ionosphere at Geomagnetically Conjugate Stations

摘要

The report consists of three parts. The first part describes a polarimeter system that has been developed and used to measure polarization of signals from geostationary satellites. Circuit diagrams and sample data are given. The system is a modification of a system described by Titheridge. The second part describes the Cold Bay operation. Electron content data have been scaled and processed for the period December 25, 1968, through April 30, 1969. When compared with Urbana, Cold Bay shows very flat content curves at winter night, very few pre-sunrise dips and wave-trains in electron content with periods varying from three to five minutes in addition to normal travelling disturbances. The day-to-day change in electron content is found to be anti-correlated at geomagnetically conjugate stations during magnetic quiet days and to be correlated during magnetic disturbances. The third part describes some theoretical work. Several other effects such as the magnetic declination effect and the effect of a dynamo electric field have been studied. (Author)