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dc.contributor.author | Liu, Huixin | en |
dc.contributor.author | Yamamoto, Mamoru | en |
dc.contributor.author | Lühr, Hermann | en |
dc.date.accessioned | 2010-02-05T07:29:11Z | - |
dc.date.available | 2010-02-05T07:29:11Z | - |
dc.date.issued | 2009-09 | - |
dc.identifier.issn | 0094-8276 | - |
dc.identifier.uri | http://hdl.handle.net/2433/95082 | - |
dc.description.abstract | The equatorial mass density anomaly (EMA) is an anomalous latitudinal distribution of the atmospheric mass density, with its equinox configuration consisting of a density trough near the Earth's dip equator flanked by density crests around ±25° dip latitude. As a novel feature, this study reveals a pronounced 4-peak longitudinal pattern of the EMA, which is in reminiscence of the wave-4 like structure in the neutral wind and the equatorial ionization anomaly (EIA). It is found that the wave-4 modulation in the EMA trough region is in phase with that in the EMA crest region, in contrast to the 180° phase reversal for the case of EIA. This difference strongly suggest that although the latitudinal structure of the EMA is principally caused by the EIA via ion drag, its wave-4 pattern likely arises from different sources. The direct penetration of the non-migrating diurnal tides DE3 to the F-region height or thermal budget modulation by the composition NO at lower thermosphere are discussed as plausible candidates. Our results reveal a 4-hour phase lag between the wave-4 patterns in neutral density and wind, and a 2% peak-to-peak amplitude of the neutral density wave-4 pattern. These results find good agreements with theoretical predictions based on direct penetration of the DE3 to F-regions heights, hence strongly support this mechanism. Our observations thus add further evidences for the influence of tropical deep convection on the thermospheric dynamics. | en |
dc.language.iso | eng | - |
dc.publisher | American Geophysical Union (AGU) | en |
dc.rights | Copyright 2009 by the American Geophysical Union. | en |
dc.rights | この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。 | ja |
dc.rights | This is not the published version. Please cite only the published version. | en |
dc.title | Wave-4 pattern of the equatorial mass density anomaly: A thermospheric signature of tropical deep convection | en |
dc.type | journal article | - |
dc.type.niitype | Journal Article | - |
dc.identifier.jtitle | Geophysical Research Letters | en |
dc.identifier.volume | 36 | - |
dc.identifier.issue | 18 | - |
dc.relation.doi | 10.1029/2009GL039865 | - |
dc.textversion | author | - |
dc.identifier.artnum | L18104 | - |
dcterms.accessRights | open access | - |
出現コレクション: | 学術雑誌掲載論文等 |
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