Automated detection of Pi 2 pulsations using wavelet analysis: 1. Method and an application for substorm monitoring
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- Nosé M.
- Faculty of Science, Kyoto University
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- Iyemori T.
- Faculty of Science, Kyoto University
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- Takeda M.
- Faculty of Science, Kyoto University
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- Kamei T.
- Faculty of Science, Kyoto University
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- Milling D. K.
- Department of Physics, University of York
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- Orr D.
- Department of Physics, University of York
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- Singer H. J.
- NOAA, Space Environment Center, Boulder
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- Worthington E. W.
- College Observatory, U.S. Geological Survey
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- Sumitomo N.
- Disaster Prevention Research Institute, Kyoto University
Bibliographic Information
- Other Title
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- Automated detection of Pi2 pulsations u
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Abstract
Wavelet analysis is suitable for investigating waves, such as Pi 2 pulsations, which are limited in both time and frequency. We have developed an algorithm to detect Pi 2 pulsations by wavelet analysis. We tested the algorithm and found that the results of Pi 2 detection are consistent with those obtained by visual inspection. The algorithm is applied in a project which aims at the nowcasting of substorm onsets. In this project we use real-time geomagnetic field data, with a sampling rate of 1 second, obtained at mid- and low-latitude stations (Mineyama in Japan, the York SAMNET station in the U.K., and Boulder in the U.S.). These stations are each separated by about 120° in longitude, so at least one station is on the nightside at all times. We plan to analyze the real-time data at each station using the Pi 2 detection algorithm, and to exchange the detection results among these stations via the Internet. Therefore we can obtain information about substorm onsets in real-time, even if we are on the dayside. We have constructed a system to detect Pi 2 pulsations automatically at Mineyama observatory. The detection results for the period of February to August 1996 showed that the rate of successful detection of Pi 2 pulsations was 83.4% for the nightside (18-06MLT) and 26.5% for the dayside (06-18MLT). The detection results near local midnight (20-02MLT) give the rate of successful detection of 93.2%.
Journal
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- Earth, Planets and Space
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Earth, Planets and Space 50 (9), 773-783, 1998
Society of Geomagnetism and Earth, Planetary and Space Sciences, The Seismological Society of Japan, The Volcanological Society of Japan , The Geodetic Society of Japan , The Japanese Society for Planetary Sciences
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Details 詳細情報について
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- CRID
- 1390282681486981888
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- NII Article ID
- 10003737024
- 10003736025
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- NII Book ID
- AA11211921
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- ISSN
- 18805981
- 13438832
- http://id.crossref.org/issn/13438832
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- NDL BIB ID
- 4590646
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed