The Bulletin of The Korean Astronomical Society (천문학회보)
- Volume 36 Issue 2
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- Pages.81.2-81.2
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- 2011
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- 1226-2692(pISSN)
Kalman filter technique for defining solar regular geomagnetic variations
- Martini, Daniel (School of Space Research, Kyung Hee University) ;
- Orispaa, Mikko (Sodankyla Geophysical Observatory) ;
- Ulich, Thomas (Sodankyla Geophysical Observatory) ;
- Lehtinen, Markku (Sodankyla Geophysical Observatory) ;
- Mursula, Kalevi (Dept. of Physics, University of Oulu) ;
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Lee, Dong-Hun
(School of Space Research, Kyung Hee University)
- Published : 2011.10.05
Abstract
Motivated by recent attempts to derive geomagnetic activity from hourly mean data in long term studies, we test the recursive Kalman filter method to obtain the regular solar variation curve of the geomagnetic field. Using a simple algorithm, we are able to assign a quiet day curve to every day separately, without the need for additional input parameter(s) to define the geomagnetically quiet days. We derive a digital counterpart AhK of the analog range index Ak at the subauroral Sodankyl
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