Automated detection of Pi 2 pulsations using wavelet analysis: 1. Method and an application for substorm monitoring

• Nosé M.

  Faculty of Science, Kyoto University

• Iyemori T.

  Faculty of Science, Kyoto University

• Takeda M.

  Faculty of Science, Kyoto University

• Kamei T.

  Faculty of Science, Kyoto University

• Milling D. K.

  Department of Physics, University of York

• Orr D.

  Department of Physics, University of York

• Singer H. J.

  NOAA, Space Environment Center, Boulder

• Worthington E. W.

  College Observatory, U.S. Geological Survey

• Sumitomo N.

  Disaster Prevention Research Institute, Kyoto University

Bibliographic Information

Other Title

• Automated detection of Pi2 pulsations u

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

• Earth, Planets and Space

  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

Keywords

• Space and Planetary Science
• Geology

Details

• CRID: 1390282681486981888
• NII Article ID: 10003737024
• NII Article ID: 10003736025
• NII Book ID: AA11211921
• DOI: 10.1186/bf03352169
• ISSN: 18805981
• ISSN: 13438832
• ISSN: http://id.crossref.org/issn/13438832
• NDL BIB ID: 4590646
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4590646
• Web Site: https://link.springer.com/content/pdf/10.1186/BF03352169.pdf
• Web Site: https://link.springer.com/article/10.1186/BF03352169/fulltext.html
• Web Site: http://link.springer.com/content/pdf/10.1186/BF03352169
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed