Ionospheric Research Using Satellites.
Final scientific rept. 1 Nov 71-30 Sep 76,
DANISH METEOROLOGICAL INST COPENHAGEN GEOPHYSICAL DEPT
Pagination or Media Count:
Amplitude scintillation records have been obtained of the 136 MHz beacon signal of the polar orbiting satellite NIMBUS 4. The records have been made at Narssarssuaq, Greenland, and cover the local time interval 22-02 of the auroral oval. The average behavior of scintillation versus zenith and azimuth is compared to a theoretical index deduced using weak scattering theory. The ionospheric irregularities are represented by a power law spectrum proportional to the inverse 4-th power of k, where k is the irregularity wave number. The comparison shows that the irregularities are elongated along the field lines with an elongation factor equalto or greater than 2.5. Probably they are also elongated in the magnetic eastwest direction with an elongation factor slightly greater than one. The night time scintillation corrected for geometric variation shows a marked increase when moving from sub-auroral to auroral oval latitudes. Author
- Atmospheric Physics