The Role of Energetic Particle Precipitation in Extremely Low Frequency (ELF) Propagation Anomalies.
Abstract
The purpose of the present report is to present further work on the influence of precipitating energetic particles on ELF propagation. The effort principally involves the effects of solar particle events in enhancing the conductivities of the earth's ionosphere wave guide. Calculations have been made of the sensitivity of the ELF signal strength to changes in the conductivities over the transmitter that may occur during SPE conditions. In order to be able to calculate more accurately the changes in ELF signal strength associated with solar particle events and other disturbed conditions at twilight, new electron density data measured in the 4 August 1972 event have been used to provide increased knowledge of twilight behavior which will lead to improvements in ion chemistry modelling. The effects of the charge deposition in the polar caps on the earth's electric fields and current systems have been modeled. More realistic ambient electron and ion density daytime profiles have been proposed to provide accurate baseline signal strength calculations.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 24, 1980
- Accession Number
- ADA100493
Entities
People
- Joseph B. Reagan
- Robert C. Gunton
- Roland E. Meyerott
- Trygve R. Larsen
- William L. Imhof
Organizations
- Lockheed Martin Missiles and Space