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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/angeo-2019-147
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-2019-147
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: regular paper 29 Nov 2019

Submitted as: regular paper | 29 Nov 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Annales Geophysicae (ANGEO).

On the correlation between ROTI and S4

Yang Liu1 and Sandro Radicella2 Yang Liu and Sandro Radicella
  • 1School of Instrumentation Science and Opto-Engineering; Beihang University, Beijing, 100191, P.R. China
  • 2Abdus Salam International Centre for Theoretical Physics, Telecommunications/ICT for Development Laboratory, Trieste, 34151, Italy

Abstract. The correlation between Rate of TEC index (ROTI) and amplitude scintillation index S4 has been under focus for years, since both of the two are associated with ionospheric irregularities. Previous studies show that the behavior of the correlation between ROTI and S4 is not regular. To address this problem, in the present work the relation between S4, ROTI and the Differential Rate of TEC index (DROTI) has been investigated, assuming the single screening model for trans-ionospheric radio propagation. The influences of the effective velocity and elevation angle and their variability on the correlation between ROTI and S4 are analyzed. Data from two stations of Scintillation Network Decision Aid (SCINDA) network are used for the study. Results show that the variability of effective velocity plays a crucial role on the correlation between the amplitude scintillation index and the TEC rate of change indices. Based on the Gaussian assumption of effective velocity distribution, a high correlation coefficient can be achieved only under low variability conditions.

Yang Liu and Sandro Radicella
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Yang Liu and Sandro Radicella
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Short summary
In this work, the correlation between ROTI and S4 is investigated based on a derived mathematical model under the assumption of single screening model for trans-ionospheric signal propagation. The correlation between ROTI and S4 is strongly affected by the variability of the effective velocity, and the correlation coefficient is degraded when the variability increases.The scintillation index S4 depends on the ionospheric irregularities, the effective velocity and the radio propagation path.
In this work, the correlation between ROTI and S4 is investigated based on a derived...
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