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PMWE were identified for 110 days from March to September 2013. PMWE occurrence frequency increased abruptly in May when two solar proton events occurred. PMWE were also observed even during periods without any solar proton events, suggesting that a possible cause of the PMWE is ionization by energetic electron precipitations. The monthly mean PMWE characteristics showed that occurrence of PMWE were mainly restricted to sunlit time. This fact indicates that electrons detached from negatively charged particles play an important role. While PMWE below 72 km in altitude completely disappeared before sunset, it was detected above that altitude for a few hours even after sunset. This height dependence in the altitude range of 60–80 km can be explained qualitatively by empirical effective recombination rates.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1420564276169810432","@type":"Researcher","personIdentifier":[{"@type":"KAKEN_RESEARCHERS","@value":"00704876"},{"@type":"NRID","@value":"1000000704876"},{"@type":"NRID","@value":"9000399770567"},{"@type":"NRID","@value":"9000256248710"},{"@type":"NRID","@value":"9000005728390"},{"@type":"NRID","@value":"9000005099251"},{"@type":"NRID","@value":"9000311488203"},{"@type":"RESEARCHMAP","@value":"https://researchmap.jp/7000007196"}],"foaf:name":[{"@value":"Takanori Nishiyama"}],"jpcoar:affiliationName":[{"@value":"National Institute of Polar Research  Tachikawa 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