UHF/GHz scintillation observed at Ascension Island from 1980 through 1982

Three years' scintillation measurements taken at Ascension Island have been reduced and are presented here. The 1.5-GHz and 257-MHz signals of Marisat were supplemented by 3.9-GHz observations during January–May 1981. While their temporal patterns are similar to those found earlier in the Afro-American zone, they exhibited unusually frequent occurrence of heavy scintillation at gigahertz frequencies often exceeding 30 dB at 1.5 GHz and 7 dB at 4 GHz. These patterns are attributed in part to the position of the station near the southern peak of the Appleton anomaly. Comparisons are made between these and similar observations taken at Hong Kong, near the northern peak of the anomaly.

[1]  C. Liu,et al.  A morphological study of gigahertz equatorial scintillations in the Asian region , 1983 .

[2]  S. Basu.  Equatorial scintillations—a review , 1981 .

[3]  J. Aarons,et al.  Seasonal and geomagnetic control of equatorial scintillations in two longitudinal sectors , 1980 .

[4]  Jules Aarons,et al.  Microwave equatorial scintillation intensity during solar maximum , 1981 .

[5]  R. M. Christiansen.  S-band propagation disturbance during ALSEP mission support Preliminary report, 19 Nov. 1969 - 30 Jun. 1970 , 1971 .

[6]  S. Basu,et al.  Occurrence of nighttime VHF scintillations near the equatorial anomaly crest in the Indian sector , 1981 .

[7]  J. Austen,et al.  Gigahertz scintillations associated with equatorial patches , 1983 .

[8]  J. Gérard,et al.  Magnetic storm effects on the tropical ultraviolet airglow , 1977 .

[9]  J. Mullen.  Sensitivity of equatorial scintillation to magnetic activity , 1973 .

[10]  Herbert E. Whitney,et al.  Notes on the Relationship of Scintillation Index to Probability Distributions and Their Uses for System Design , 1974 .

[11]  Jules Aarons,et al.  Coordinated study of equatorial scintillation and in situ and radar observations of nighttime F region irregularities , 1980 .

[12]  M. R. Paulson.  Scintillation of VHF/UHF and L band satellite signals at Guam , 1981 .

[13]  S. Basu,et al.  Long‐term 1.5 GHz amplitude scintillation measurements at the magnetic equator , 1980 .

[14]  S. Franke,et al.  Nighttime VHF and GHz scintillations in the East-Asian sector of the equatorial anomaly , 1983 .

[15]  S. Basu,et al.  Statistics of VHF and L-band scintillation at Huancayo, Peru , 1977 .