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Woodman Pollitt, Ronald Francisco; Pingree, Joseph E.; Swartz, Wesley E.
(Elsevier, 1985-08)
Until now the presence of F-region irregularities responsible for spread-F (sp-F) traces in ionograms has been considered as a purely night-time phenomenon extending sporadically lo the early morning hours. We here in respond that, on two occasions (26 March 1974 and 1 February 1984) similar irregularities ...