[P-EM06_1PM1] Study of coupling processes in Sun-Earth system with large radars and large-area observations

[PEM06-34] アジア海洋大陸における積乱雲活動と全球雲変動

*高橋 幸弘¹、佐藤 光輝¹、山下 幸三² (1.北海道大学・宇宙理学専攻、2.サレジオ高専)

キーワード：アジア海洋大陸, 積乱雲活動, 熱帯, 雲量, OLR, 太陽活動

Global relationship among the thunderstorm activities especially in Asia Maritime Continent, cloud variations in tropical regions and solar parameters was examined based on lightning data measured by Global ELF observation Network (GEON) operated by Hokkaido University and Outgoing Longwave Radiation (OLR) intensity. A correlated analysis between the number of the lightning strokes, cloud variation in the tropical regions, and solar parameters was examined, looking into the variation with ~one month periodicity. It was found that the number of lightning stokes in Asia Maritime Continent (AMC) varies with about month periodicity in the period from February to June 2004 and shows positive correlation (R= ~0.8) with OLR in the Western Pacific Warm Pool (WPWP). On the other hand, OLR in the central Africa shows negative correlation with the number of lightning stokes in the AMC in that period. It is also found that the galactic cosmic rays or UV intensity associated with solar activity shows good correlation with tropical OLR or lightning activity in AMC. One explanation to connect such global variations in thunderstorm / cloud amount with solar parameters would be the electrical circuit between lower and upper atmospheres. The radars distributed globally would provide some essential information for this hypothesis, such as conductivity in the lower ionosphere, which may determine the strength of electrical connection in the vertical and horizontal directions.