High‐latitude irregularity spectra deduced from scintillation measurements

A. W. Wernik, C. H. Liu, S. J. Franke, M. Gola

Research output: Contribution to journalArticlepeer-review


High‐latitude scintillation data show that the strength and spectral index of intensity scintillation are dependent on the propagation geometry. It will be shown that anisotropic irregularity spectra, with different indices along and across the magnetic field, lead to geometrical effects similar to those observed. In general, the spectrum along the magnetic field is steeper than that across the field, and the difference is more pronounced for nighttime conditions. Spectral anisotropy can be interpreted as a size‐dependent irregularity anisotropy. Our data indicate that large‐scale irregularities in the daytime and nighttime ionosphere are almost isotropic, while small‐scale irregularities are anisotropic and considerably more so at night than during the day. It will be shown that anisotropic irregularity spectra could account for the observed scintillation and in situ temporal spectra with frequency‐dependent slope. The effect depends strongly on the geometry.

Original languageEnglish (US)
Pages (from-to)883-895
Number of pages13
JournalRadio Science
Issue number5
StatePublished - 1990
Externally publishedYes

ASJC Scopus subject areas

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


Dive into the research topics of 'High‐latitude irregularity spectra deduced from scintillation measurements'. Together they form a unique fingerprint.

Cite this