Year: 2021
Author: Dan Li, Jianwei Yang, Peng Lai, Kai Zhao, Yewen Wu
Journal of Information and Computing Science, Vol. 16 (2021), Iss. 2 : pp. 148–159
Abstract
The ionosphere has an impact on the radio system, therefore, the determination of the ionospheric state is significant. The total electron content (TEC), as an important ionospheric parameter, can characterize the state of the ionosphere. This paper introduces a new ionospheric disturbed index N13 by correcting the existing index N27, and also proposes the theory foundation for determination the ionospheric state using cross validation method. The N13 is defined as the normalized relative variation of the ionospheric TEC, in which the TEC background value is the sliding median of 27 days. Analyzing the N13 calculated from the TEC data at Taipei station from January 2002 to July 2014, the results show that the two indexes N13 and N27 generally have the same statistical characters against with season and local time, however, they are always different at one time. Based on the probability density function of N13，an optimization model is also constructed to determine the ionospheric disturb proportion by cross validation method. It is found that the proportion is about 25%, when the ionospheric disturbed index range is $N_{13}<−1$ or $N_{13}>1.$
Journal Article Details
Publisher Name: Global Science Press
Language: English
DOI: https://doi.org/2024-JICS-22373
Journal of Information and Computing Science, Vol. 16 (2021), Iss. 2 : pp. 148–159
Published online: 2021-01
AMS Subject Headings:
Copyright: COPYRIGHT: © Global Science Press
Pages: 12
Keywords: Ionospheric disturbed index Ionospheric disturbed proportion Ionospheric disturbed determination cross validation.