On the nature of the electrojet irregularities responsible for daytime VHF scintillations
Article first published online: 20 SEP 2012
Copyright © 1977 by the American Geophysical Union.
Journal of Geophysical Research
Volume 82, Issue 32, pages 5262–5266, 1 November 1977
How to Cite
1977), On the nature of the electrojet irregularities responsible for daytime VHF scintillations, J. Geophys. Res., 82(32), 5262–5266, doi:10.1029/JA082i032p05262., , and (
- Issue published online: 20 SEP 2012
- Article first published online: 20 SEP 2012
- Manuscript Accepted: 19 MAY 1977
- Manuscript Received: 7 FEB 1977
The nature of electrojet irregularities responsible for daytime VHF scintillations at 41 and 140 MHz observed at Huancayo, Peru, has been examined by conducting a study of simultaneous scintillation measurements, ionograms, and 50-MHz oblique radar backscatter. It is found that the times of onset and decay of VHF scintillations correspond closely with the times of onset and decay of type 2 irregularities identified by the radar as well as Esq echoes oil ionograms, indicating thereby that type 2 irregularities cover the scale size range of at least 1 km to a few meters. By assuming a three-dimensional irregularity power spectrum of spectral index 4 and an outer scale dimension of 2 km the range of daytime scintillations at 41 MHz is shown to be consistent with irregularity amplitudes of approximately 5–15% for an ambient ionization density of 1011 m−3.