Results from a Year-Long Auroral-E Measurement Campaign
NAVAL COMMAND CONTROL AND OCEAN SURVEILLANCE CENTER RDT AND E DIV SAN DIEGO CA
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The Disturbance Impact Assessment System DIAS was developed to make qualitative assessments of the impact of solar flares on high latitude HF propagation. The system employed new techniques in expert system technology to describe some of the vaguer aspects in high latitude disturbance phenomenology. In developing the rulesets for the different high latitude disturbances, it was obvious that there was some confusion regarding the occurrence characteristics of sporadic-E, auroral sporadic-E, and just plain auroral-E. It was very difficult to determine the type of sporadic ionization being described in different studies. In order to gain better insight on the characteristics of auroral-E so an accurate ruleset for DIAS could be developed, it was decided to conduct a year-long measurement campaign. This report will describe the results of the first year of measurements, present theories on the generation of sporadic ionization at E-region ionospheric heights and finally attempt to correlate the observations to the theories.
- Atmospheric Physics
- Radiofrequency Wave Propagation