Abstract
ABS>An examination of diurnal and seasonal variation of the occurrences of three different types of sporadic ionization E, namely, equatorial, low, and flat types, at the South American transequatorial chain of stations is discussed. Lunar influences and some correlation with geomagnetic disturbances on the occurrences are also discussed. The Huancayo ionograms are examined in some detail to study closely the equatorial E/sub s/, particularly its sudden disappearances. The Huancayo magnetograms are also examined to associate some of the observed characteristics of E/sub s/ with certain distinctive features of the magnetograms. (auth)
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