I. Total electron content
Total Electron Content Studies in Equatorial Regions
Article first published online: 7 DEC 2012
Copyright 1970 by the American Geophysical Union.
Volume 5, Issue 6, pages 869–880, June 1970
How to Cite
1970), Total Electron Content Studies in Equatorial Regions, Radio Sci., 5(6), 869–880, doi:10.1029/RS005i006p00869.(
- Issue published online: 7 DEC 2012
- Article first published online: 7 DEC 2012
- Manuscript Received: 1 DEC 1969
This paper reviews current knowledge of the diurnal variation and spatial distribution of total electron content in the equatorial ionosphere. The problems of data reduction peculiar to stations near the equator are considered. There is a large diurnal variation up to 40∶1 that is greatest at the equinoxes and least in local winter. An ‘equatorial anomaly’ in total electron content similar to the anomaly observed in f0F2 exists and is largely associated with the topside. Considerable differences in detail, particularly with regard to the time of disappearance of the anomaly, occur at different longitudes. Peaks of ionization have been observed around 2300 LT at about 26° of magnetic dip. Although little correlation has been found with magnetic activity on individual days, collective data indicate a reduction in the depth of the equatorial trough with magnetic disturbances, with the maxima occurring closer to the dip equator. More detailed work is indicated on the effects of longitude and magnetic activity, on the nighttime content, and on large-scale irregularities.