Optimized estimation of foF2 using GNSS data ingestion to NeQuick model during magnetic storm

doi:10.11947/j.AGCS.2020.20180260

Abstract

Abstract: The critical frequency of F2 is an important parameter for high frequency communications. Ionosonde measured foF2 is an effective way but it would be affected by geomagnetic storm which will even lead to the data missing. NeQuick model could estimate the TEC and foF2.But the accuracy would be degraded during geomagnetic storm. Using the dual frequency GNSS data from the CMONOC(Crustal Movement Observation Network of China)and applying the regional polynomial model, the accurate TEC could be retrieved. Based on the condition that the sum of the squared errors is the minimum, the effective ionized parameter Az could be estimated using the calculated TEC. Using the NeQuick model input by ionized parameter Az, the TEC and foF2 could be retrieved. Using the observations of five ionosonde stations located in different latitudes is in China, the result indicated that the TEC RMS improved 20%~40%, and the foF2 RMS improved 10%~25%. This method could improve the TEC and foF2 accuracy. It showed the benefit of low cost. So it could be considered as the alternative way to the ionosonde observations especially for the foF2 data missing period.

Key words: NeQuick model, ionosphere, GNSS, total electron content, foF2, geomagnetic storm

CLC Number:

P228

HAN Ling, WANG Jiexian, CHEN Yanling, LIU Jingbin, LI Haojun. Optimized estimation of foF2 using GNSS data ingestion to NeQuick model during magnetic storm[J]. Acta Geodaetica et Cartographica Sinica, 2020, 49(1): 14-23.

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