Abstract

AbstractThis paper presents and discusses the occurrence of F layer quadruple stratification (StF‐1, StF‐2, StF‐3, and StF‐4) during southern hemisphere winter season (June, July, and August 2002) and high solar activity condition, which was observed at Palmas (10.3°S, 48.3°W; dip latitude 5.5°S—near equatorial region), Brazilian sector. This is the first time that the formation of F layer quadruple stratification (StF‐1, StF‐2, StF‐3, and StF‐4) has been reported in the South American sector. The StF‐4 has a short lifetime compared with triple stratification/F3 layer, and it is antecedent and followed by triple/F3 layer stratification.

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