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The Scientific World Journal - Volume 2015 2015, Article ID 376702, 11 pages -

Research Article

School of Electronic Information, Wuhan University, No. 129 Luoyu Road, Wuhan 430079, China

China Research Institute of Radiowave Propagation, No. 36 Xianshandong Road, Qingdao 266107, China

University of Chinese Academy of Sciences, Beijing 100029, China

Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China

The Abdus Salam International Center for Theoretical Physics, T-ICT4D Laboratory, 34100 Trieste, Italy

The Constellation Observing System for Meteorology, Ionosphere, and Climate Program Office, University Corporation for Atmospheric Research, Boulder, CO 80303, USA

Received 18 June 2014; Revised 18 August 2014; Accepted 19 August 2014

Academic Editor: Zhaojin Rong

Copyright © 2015 Xiao Yu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The global ionospheric maps GIMs, generated by Jet Propulsion Laboratory JPL and Center for Orbit Determination in Europe CODE during a period over 13 years, have been adopted as the primary source of data to provide global ionospheric correction for possible single frequency positioning applications. The investigation aims to assess the performance of new NeQuick model, NeQuick 2, in predicting global total electron content TEC through ingesting the GIMs data from the previous days. The results show good performance of the GIMs-driven-NeQuick model with average 86% of vertical TEC error less than 10 TECU, when the global daily effective ionization indices Az versus modified dip latitude MODIP are constructed as a second order polynomial. The performance of GIMs-driven-NeQuick model presents variability with solar activity and behaves better during low solar activity years. The accuracy of TEC prediction can be improved further through performing a four-coefficient function expression of Az versus MODIP. As more measurements from earlier days are involved in the Az optimization procedure, the accuracy may decrease. The results also reveal that more efforts are needed to improve the NeQuick 2 model capabilities to represent the ionosphere in the equatorial and high-latitude regions.





Autor: Xiao Yu, Chengli She, Weimin Zhen, Nava Bruno, Dun Liu, Xinan Yue, Ming Ou, and Jisheng Xu

Fuente: https://www.hindawi.com/



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