Modeling of ionospheric characteristics based on canonical correlation analysis at Bangalore for the year 2017
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Modeling of ionospheric characteristics based on canonical correlation analysis at Bangalore for the year 2017 Ravi Kiran Pyla1,2 · J. R. K. Kumar Dabbakuti3 · S. G. Prasad Mutchakayala3 · Sairam Yashoda1 · Manikanta Alluri1 Received: 19 March 2020 / Accepted: 1 September 2020 © Akadémiai Kiadó 2020
Abstract Ionospheric peak electron density (NmF2) and total electron content (TEC) are the essential measures of ionospheric variability for modeling their effects on navigation and communication system applications. The global and regional models have their limitations in predicting ionospheric variations at the low latitude Indian region, mainly due to the anomalous electron density gradients and equatorial ionization anomaly (EIA) effects. In this paper, ionospheric TEC characteristics are modeled based on canonical correlation analysis (CCA) with Global Positioning System (GPS)-TEC observations and NmF2 values at a northern low latitude station Bangalore (13.02° N and 77.57° E) during the 2017 period. The decomposed CCA modes consist of CCA patterns and their corresponding amplitudes. The short-term variations (diurnal) are reproduced by the CCA patterns, whereas the longterm variations (yearly) are reproduced by their corresponding amplitudes. The first three CCA modes represent the ionospheric features such as diurnal, sunrise and sunset enhancements, semiannual, annual, and solar-cycle variations. Further, the temporal structures of NmF2 are effectively replicated by the CCA model. NmF2 (CCA) showed relatively higher linearity (0.99) and lower RMSE (0.31 TECU), whereas NmF2 (IRI2016) showed lower linearity (0.92) and higher RMSE (1.45 TECU) with the measured-NmF2 values. Hence, the CCA approach could be an effective method for characterizing the NmF2 variations over the low latitude region. Keywords Ionospheric peak electron density · Total electron content · Canonical correlation analysis · Equatorial ionization anomaly · International reference ionosphere
* J. R. K. Kumar Dabbakuti [email protected] 1
Department of ECE, K L Deemed to be University, Koneru Lakshmaiah Education Foundation, Guntur, Andhra Pradesh 522502, India
2
J. B. Institute of Engineering and Technology, Hyderabad, Telangana, India
3
Department of ECM, K L Deemed to be University, Koneru Lakshmaiah Education Foundation, Guntur, Andhra Pradesh 522502, India
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Vol.:(0123456789)
Acta Geodaetica et Geophysica
1 Introduction The important domain of the cosmic space environment is the Ionosphere, where the existence of ionization has been influencing ionospheric radio-wave propagation. The satellite-based navigation, positioning, and communication system performances have been dynamic due to the composite difference in the ionospheric structure in both temporal and spatial distributions. The peak ionospheric electron density (NmF2) and the total electron content (TEC) are crucial parameters to understand and model the Spatio-temporal variations and their effects on radio wave propagations (Gulyaeva 1997). NmF2 and TEC vari
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