Accession Number : ADA263158
Title : Auroral-E Observations: The First Year's Data.
Descriptive Note : Final technical rept. 1 Aug 1991-31 Aug 1992
Corporate Author : NAVAL COMMAND CONTROL AND OCEAN SURVEILLANCE CENTER RDT AND E DIV SAN DIEGO CA
Personal Author(s) : Rose, R B ; Hunsucker, R D
Report Date : Feb 1993
Pagination or Media Count : 73
Abstract : 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.
Descriptors : *OBSERVATION , *AURORAE , TEST AND EVALUATION , FREQUENCY , CONTROL , SITES , PATHS , SIGNALS , ANTENNAS , IONIZATION , SUBMARINES , SKY WAVES , NUMBERS , OCEANS , SKY , PERSONNEL , LABORATORIES , EXPERT SYSTEMS , TRANSMITTERS , ELECTROJETS , SEASONS , SUNSPOTS , OCEAN SURVEILLANCE , DIPOLE ANTENNAS , SURVEILLANCE , DIPOLES , RECEIVERS , TIME , INTENSITY , FACILITIES , PROPAGATION , MODELS
Subject Categories : Atmospheric Physics
Distribution Statement : APPROVED FOR PUBLIC RELEASE