Development of a Data-Verified Ionospheric Model with an Ionosonde Network

다국어 초록 (Multilingual Abstract)

As a base model for space weather application, we develop an ionospheric model (SAMI2-CNU) by revising the open source SAMI2 model. The revision includes the photoionization of X-rays in the range below 50 °A and photoelectron impact ionization. As a solar flux input to the model, we utilize the real-time solar extreme ultraviolet (EUV) and X-ray (1 105.0 nm) fluxes of the FISM (flare irradiance spectral model). In order to verify the SAMI2-CNU model, we compare the peak densities of the E and the F2 layers with those from the GIRO (Global Ionospheric Radio Observatory) network for 110 days with the F10.7 range of 70 − 280 in the last solar cycle. The model provides larger values of NmF2 by 30 − 40%, but the NmE values are reasonably close to the ionosonde values. By carrying out a linear correlation analysis between the model and the ionosonde values, we derived scale factors of 0.67 and 0.41 for the photoionization rates in the F2 and the E regions, respectively. With these scale factors, the SAMI2-CNU model allows us to match the ionosonde NmF2 and NmE values within 7% on the average. We also simulated ionospheric changes during eight solar flare events and found averaged 20% and 46% enhancements of NmF2 and NmE, respectively, over the pre-flare values. Although the SAMI2-CNU model has the same problem with matching the NmF2 enhancement as the original SAMI2, it provides reasonable estimates of the NmE increase, as well as reasonable matches of the NmF2 and the NmE values with the ionosonde values. Thus, the SAMI2-CNU model can be used as a physics model in the data-assimilated model that is being developed for the regional ionosphere around the Korea peninsula.

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