Robust Processing of Magnetotelluric Data from the Auroral Zone
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- Garcia Xavier
- Departament de Geologia Dinamica i Geofisica, University of Barcelona
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- Chave Alan D.
- Woods Hole Oceanographic Institution
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- Jones Alan G.
- Geological Survey of Canada, 1 Observatory Crescent
書誌事項
- タイトル別名
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- Robust Processing of Magnetotelluric Da
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抄録
Magnetotelluric (MT) data acquired during September-October, 1994, in northern Canada, were strongly influenced by non-uniform source field contributions from the auroral electrojet, and especially by intense auroral episodes. The largest effect on the estimate of the magnetotelluric impedance tensor elements was during intervals of highest magnetic activity, which primarily correlated with high auroral activity and was observed during local nighttime. In comparison, during the day the effect on the normal magnetotelluric impedance tensor response was usually, but not always, small. A robust controlled-leverage processing algorithm was applied to these data in an attempt to extract the stable uniform field estimates of the impedance. The differences between nonrobust and robust processing of the entire data set is compared to that obtained after dividing the time series into daytime and nighttime segments. The nonrobust estimate using all data is controlled by the nocturnal data, which are, in turn, dominated by non-uniform source effects. However, nonrobust processing of only the daytime data fails to recover a useful result. There is little difference between the robust response for the entire and daytime data provided that the fraction of auroral activity is not large, i.e., in excess of half of the available data series. In addition, examination of the time-dependence of the response functions shows that the strongest bias is observed during the initial quarter of an auroral event.
収録刊行物
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- Journal of geomagnetism and geoelectricity
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Journal of geomagnetism and geoelectricity 49 (11-12), 1451-1468, 1997
地球電磁気・地球惑星圏学会
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詳細情報 詳細情報について
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- CRID
- 1390282681485582080
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- NII論文ID
- 130003559489
- 10002205065
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- NII書誌ID
- AA00698879
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- ISSN
- 21855765
- 00221392
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- NDL書誌ID
- 4406017
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
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- 抄録ライセンスフラグ
- 使用不可