Multifrequency study of ionospheric scintillation at Ascension Island

S. J. Franke, C. H. Liu, D. J. Fang

Research output: Contribution to journalArticlepeer-review


Multifrequency amplitude scintillation data at L and C bands from the equatorial region at Ascension Island are used to study the spectral index n for the scintillation index S4. The average frequency dependence of the scintillation index (S4) is found to be f−1.68. It is shown that the spectral index tends to be larger for events which occur after 2030 local time than for events which occur before 2030. This may indicate temporal evolution of the irregularity spectrum. Model studies based on a two component power law irregularity spectrum are applied to relate changes in n to spectral evolution and to show that the observations are consistent with recent in situ measurements. Possible geophysical implications are also discussed.

Original languageEnglish (US)
Pages (from-to)695-706
Number of pages12
JournalRadio Science
Issue number3
StatePublished - 1984
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics
  • General Earth and Planetary Sciences
  • Electrical and Electronic Engineering


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