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“Space weather forecast”: Prediction of relativistic electron intensity at synchronous orbit
Author(s) -
Nagai Tsugunobu
Publication year - 1988
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl015i005p00425
Subject(s) - earth's magnetic field , geomagnetic storm , flux (metallurgy) , space weather , physics , orbit (dynamics) , electron , computational physics , intensity (physics) , atmospheric sciences , storm , environmental science , meteorology , magnetic field , nuclear physics , optics , materials science , quantum mechanics , engineering , aerospace engineering , metallurgy
Long‐term variations in high‐energy (greater than 2 MeV) electron flux at synchronous orbit are examined to reveal their close relationship to geomagnetic activity. The electron flux diminishes rapidly in association with an enhancement of geomagnetic activity (storm) and then increases. The flux becomes higher than the pre‐storm level and its peak occurs approximately 4–5 days after the enhancement of geomagnetic activity. A linear prediction filter is designed for daily sums of Kp as input data and corresponding daily averages of the electron flux (Log value) as output data. The data are those taken in 1984–1985. This filter can successfully reproduce the electron flux behavior observed not only in 1984–1985 but also in 1978–1981.