A simple method for deriving the uniform field MT responses in auroral zones
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- Jones Alan G.
- Geological Survey of Canada
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- Spratt Jessica
- Geological Survey of Canada
書誌事項
- タイトル別名
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- simple method for deriving the uniform field MT responses in auroral zones
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説明
Source field effects in magnetotelluric data acquired at high geomagnetic latitudes can result in erroneous interpretations of Earth conductivity structure deep within the mantle. This paper describes a simple technique most appropriate for a region that is dominantly one-dimensional (1-D) and uses the vertical magnetic field variations for identifying intervals of likely low contamination by non-uniform sources. Times are chosen when the variations stay within prescribed limits defined on the basis of a histogram of the variations for the whole recording interval. An example is given showing application of the method for data from a site under the auroral oval at a time when solar activity was at its lowest for the last solar cycle. A model derived from the responses obtained by processing all available data implies a decrease in resistivity at about 350 km to about 100Ω. m. In contrast, the model obtained from low activity interval responses shows a less rapid decrease in resistivity, without a change at around the 410 km phase boundary. The responses obtained from all data can be explained by the influence of a source with an average wavelength of 3, 000 km.
収録刊行物
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- Earth, Planets and Space
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Earth, Planets and Space 54 (5), 443-450, 2002
地球電磁気・地球惑星圏学会 、公益社団法人 日本地震学会、特定非営利活動法人 日本火山学会、日本測地学会、日本惑星科学会
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詳細情報 詳細情報について
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- CRID
- 1390282681489144704
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- NII論文ID
- 10008600151
- 130003780895
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- NII書誌ID
- AA11211921
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- ISSN
- 18805981
- 13438832
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- NDL書誌ID
- 6166025
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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
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