Amplitude and Phase Scintillation and Ionospheric Irregularities at Sub-Auroral Latitudes
Interim rept. 30 Sep 1987-31 Mar 1989
UNIVERSITY COLL OF WALES ABERYSTWYTH DEPT OF PHYSICS
Pagination or Media Count:
Intensity and phase scintillation has been studied by monitoring transmissions from NNSS satellites at Lerwick, a sub-auroral location in northern UK. Observations commenced in July 1987 and the first part of the present report concentrates on an analysis of scintillation occurrence morphology during the first ten months of the investigation. A discrete region of irregularities close to the boundary is implied from the observations while the absence of a significant geometrical enhancement about the geomagnetic field position suggests that the irregularities close to the boundary may have small axial ratios. The remainder of the report is concerned with a comparative study of the scintillation boundary for irregularities of sub-kilometer scale and the boundary of 30 m scale irregularities causing auroral backscatter of HF radar signals. In general the scintillation boundary was found to be some 7 to 8 deg polewards of that detected by the radar. In a reanalysis of the data a reconciliation could be made to get agreement in only about half of cases studied. Keywords Radio wave scintillations Ionospheric irregularities High latitude ionosphere Great Britain.
- Atmospheric Physics