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Ionograms recorded from four ionosonde stations along the Western Pacific (WestPac) chain (about 122 o E geographic, 192 o E geomagnetic) are employed to study the occurrence of an additional layer at F-region altitudes during the 1-15 March 1998 WestPac campaign. It was found that the appearance of the additional layer at the local noontime hours is a typical phenomenon at Parepare...
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