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Use of a Global Effective Sunspot Number IG12 for Long-term Ionospheric Predictions

Liu Bui-yuan, Liu Ke-feng, Zhou Yu-zhi   

  1. China Research Institute of Radio-wave Propagation
  • Received:1984-12-03 Revised:1900-01-01 Online:1985-08-24 Published:1985-08-24

Abstract: The possibility of the use of a global effective sunspot number IG12 for long-term ionospheric predictions is investigated in this paper based on the data of vertical incidence sounding stations in China. It is shown that the relationship between the ionos-pherically-derived index IG12 and the ionospheric characteristic (f0F2 or F2(3000)MUF) is better than that between sunspot number R12 and the ionospheric characteristic.The efficacy of the use of IG12 for predicting f0F2, M(3000)F2 and F, (4000)MUFis evaluated, using CCIR Report 340, by comparison with R12 in current use. The evidence presented shows that the use of IG12 instead of R12 in the CCIRprediction scheme yields more accurate values of f0F2 and F2(4000)MUF. In the predictions of f0F2 and -F2(4000)MUF 12-month in advance. The average improvments in accuracy are about 18% and 10% respectively. Other advantages arising from the use of the IG12 index are also discussed.