Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005pabei..23..363z&link_type=abstract
Progress in Astronomy (ISSN 1000-8349), Vol. 23, No. 4, p. 363 - 370 (2005)
Astronomy and Astrophysics
Astronomy
Astrometry, Gps, Tec, Gaussian Process, Anomaly Detection
Scientific paper
Usually, ionospheric Total Electron Content (TEC) variation with time can be viewed as a stationary random process under quiet conditions. However, sudden events of the Sun and the Earth such as solar flare and sudden commencement of geomagnetic storms may induce the disturbances of the ionosphere, so that the stationary random process is broken which will lead to the statistical model parameters changing. Based on this fact, here we made use of the time series of TEC and the auto-covariance function of the stationary process to construct independent identical distribution Gauss sample so that the χ2 test can be used to detect the abnormity hidden in the sequence. In addition, GPS data collected by several IGS sites over China during the severe solar flare occurred on July 14, 2000 are used to verify the method. The results indicate that the disturbances caused by the solar flare can be effectively detected.
Huang Cheng
Ping Jin-Song
Zhang Hong-Ping
Zhu Wen-Yao
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