TY - JOUR
T1 - The Determination of Ionospheric TEC Disturbance Based on the Cross-Validation Method
AU - Li , Dan
AU - Yang , Jianwei
AU - Lai , Peng
AU - Zhao , Kai
AU - Wu , Yewen
JO - Journal of Information and Computing Science
VL - 2
SP - 148
EP - 159
PY - 2024
DA - 2024/01
SN - 16
DO - http://doi.org/
UR - https://global-sci.org/intro/article_detail/jics/22373.html
KW - Ionospheric disturbed index, Ionospheric disturbed proportion, Ionospheric disturbed determination, cross validation.
AB - <p style="text-align: justify;">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 $N_{13}&lt;−1$ or $N_{13}&gt;1.$</p>