Accession Number : ADA141236

Title :   Modelling of Ionospheric Irregularities and Total Electron Content.

Descriptive Note : Final rept. 14 Nov 80-14 Nov 83,


Personal Author(s) : Basu,S ; Basu,S ; Doherty,P ; MacKenzie,E ; Hagan,M P

PDF Url : ADA141236

Report Date : Dec 1983

Pagination or Media Count : 141

Abstract : F-region irregularities near the equator are viewed from the concept of the temporal structure of UHF scintillations and the electron content depletions associated with VHF, UHF and GHz scintillations. Near the equatorial anomaly crest, the solar cycle effect on GHz scintillation and the depolarization of VHF satellite signals are probed along with electron density irregularities using in-situ data coupled with VHF/GHJz scintillation. Occurrence of nighttime VHF scintillation in the Indian sector near the anomaly is addressed. In the midlatitude sector, coordinated incoherent scatter radar, total electron content and scintillation measurements are studied in the investigation of the generation of km-scale irregularities which spatial variability of total electron content is analyzed in the Mediterranean region. At high latitudes, in-situ measurements provide the opportunity for scintillation modelling which low-energy electron precipitation measurements have been correlated with scintillations/TEC in the auroral oval. The nature of ionospheric irregularities generated by high-power, high-frequency heating has also been investigated and shown to vary between two sites studied.

Descriptors :   *Ionosphere, Variations, Electrons, Ionospheric propagation, Scintillation, Heating, Radio signals

Subject Categories : Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE