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Neural network prediction of AE data
Author(s) -
Takalo Jouni,
Timonen Jussi
Publication year - 1997
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 - 10.1029/97gl02457
Subject(s) - artificial neural network , series (stratigraphy) , time series , correlation coefficient , predictive power , computer science , algorithm , geology , machine learning , physics , paleontology , quantum mechanics
Neural network (NN) models were constructed to study prediction of the AE index. Both solar wind (vB z ) and previous observed AE inputs were used to predict AE data for different numbers of time steps ahead. It seems that prediction of the original unsmoothed AE data is possible only for 10 time steps (25 min) ahead. The predicted time series of the AE data for 50 time steps (125 min) ahead was found to be dynamically different from the original time series. It is possible that the NN model cannot reproduce the turbulent part of the power spectrum of the AE data. However, when using smoothed AE data the prediction for 10 time steps ahead gave an NMSE of 0.0438, and a correlation coefficient of 0.98. The predictive ability of the model gradually decreased as the lead time of the predictions was increased, but was quite good up to predictions for 30 time steps (75 min) ahead.