Correlation between ROTI and Ionospheric Scintillation Indices using Hong Kong low-latitude GPS data

Zhe Yang, Zhizhao Liu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

77 Citations (Scopus)


The correlation between the rate of TEC index (ROTI) and scintillation indices S4 and σΦ for low-latitude region is analyzed in this study, using data collected from a Global Positioning System (GPS) scintillation monitoring receiver installed at the south of Hong Kong for the periods June–August of 2012 and May 2013 and July–December of 2013. The analysis indicates that the correlation coefficient between ROTI and S4/σΦ is about 0.6 if data from all GPS satellites are used together. If each individual satellite is considered, the correlation coefficients are above 0.6 on average and sometimes above 0.8. The analysis also shows that the ratio of ROTI and S4 varies between 1 and 4. The ratio ROTI/σΦ, varies between 2 and 9. In addition, it is also found that there is a good consistency between the temporal variations of ROTI with scintillation activity under different ionospheric conditions. ROTI has a high correlation relationship with scintillation indices on geomagnetically disturbed days or in solar active months. Moreover, the data observed at low elevation angles have weak correlation between ROTI and scintillation indices. These results demonstrate the feasibility of using ROTI derived from GPS observations recorded by common non-scintillation GPS receivers to characterize ionospheric scintillations.
Original languageEnglish
Pages (from-to)815-824
Number of pages10
JournalGPS Solutions
Issue number4
Publication statusPublished - 1 Oct 2016


  • Correlation analysis
  • Global Positioning System
  • Ionospheric Scintillation Indices
  • Rate of TEC Index (ROTI)

ASJC Scopus subject areas

  • General Earth and Planetary Sciences


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