Volume 29 Issue 3
May  2009
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Huang Weiquan, Xiao Saiguan, Xiao Zuo, Zhang Donghe, Hao Yongqiang. Comparison Study of IRI-2007 Spread-F Occurrence Predictions and Observations[J]. Journal of Space Science, 2009, 29(3): 275-280. doi: 10.11728/cjss2009.03.275
Citation: Huang Weiquan, Xiao Saiguan, Xiao Zuo, Zhang Donghe, Hao Yongqiang. Comparison Study of IRI-2007 Spread-F Occurrence Predictions and Observations[J]. Journal of Space Science, 2009, 29(3): 275-280. doi: 10.11728/cjss2009.03.275

Comparison Study of IRI-2007 Spread-F Occurrence Predictions and Observations

doi: 10.11728/cjss2009.03.275
  • Received Date: 1900-01-01
  • Rev Recd Date: 1900-01-01
  • Publish Date: 2009-05-15
  • Ionospheric spread-F is a frequently-seen ionospheric phenomenon which plays an important role in the study of ionospheric physics. The latest IRI-2007 has extended a new function of spread-F occurrence prediction, which is based on the observational data of some low latitude stations around American sectors. The purpose of this article focuses on the accuracy of the model to see if there is regional restriction by comparing the actual observation data of spread-F occurrence at African sectors with prediction made from this model. The spread-F occurrence prediction model is based on the data of stations in American sector near the equator, while in this article we choose the data of the stations with almost the same latitude in African sector. The results show that there are obvious differences between the observations of these two African station and predictions made by the IRI-2007 model in the annual behavior of average daily occurrence rate, local time variations of annual average values and the trend with solar activity. On the other hand, the observational variations in the American stations of low latitudes and that of IRI-2007 model predictions are fairly in agreement. These results indicate that: (1) the statistical method of IRI-2007 spread-F prediction model based on the Brazilian stations' data is very good and of great reference value because it well reflects the occurrence of Spread-F in American Sector; (2) the equatorial and low latitude ionospheric spread-F phenomena show strong longitudinal effect, and the use of this model in regions other than American sector should be very careful. With different region's observational data, the universal usability of this model could be improved based on the same statistical method used in this model; (3) it provides a tool to study the longitudinal effects of spread-F by comparing the model predicted values and observational values under various conditions.

     

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