Auroral-E Observations: The First Year's Data.
Final technical rept. 1 Aug 1991-31 Aug 1992
NAVAL COMMAND CONTROL AND OCEAN SURVEILLANCE CENTER RDT AND E DIV SAN DIEGO CA
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Personnel at the Naval Command, Control and Ocean Surveillance Center, RDT and E Division, and RP Consultants conducted a year-long study to measure and characterize auroral-E propagation. Personnel installed a 100-watt transmitter at the Arctic Submarine Laboratory at Cape Prince of Wales 67 N, 168 W and a receiver at RP Consultants facilities 900 kilometers away. Both sites used simple dipole antennas. The transmitter sent a slow morse R on a frequency of 25.545 megahertz MHz. Only a very dense patch of ionization, typical of sporadic-E or auroral-E with foEs greater than 5 MHz, would sustain a sky-wave signal over this path. The solar sunspot number declined from 175 to less than 100 during the test period. Personnel recorded over 1400 auroral sporadic-mode observations whose durations spanned 1 minute to several hours. A strong diurnal dependence was noted. This document presents an initial characterization of auroral-E occurrences, noting time of day, season, and magnetic activity. It discusses some implications of auroral-E occurrence intensity. The data are also discussed with respect to the development of a new auroral-E expert system model.... Auroral-E propagation, Sporadic ionization, Auroral electrojet.
- TEST AND EVALUATION
- SKY WAVES
- EXPERT SYSTEMS
- OCEAN SURVEILLANCE
- DIPOLE ANTENNAS
- Atmospheric Physics