Basic MUF observation and comparison of HF radio frequency prediction based on different ionosphere models

Representative basic MUF of six circuits in China region of lower solar activity year was collected, which had over a 250° azimuth from 3.1° to 261.3°, and distance from 592.9 km to 1734.0 km. Then, basic MUF theoretical prediction based on ITU-R reference ionospheric model and China reference ionospheric model are compared with observation data. The results show that: 1) basic MUF prediction method recommended in ITU-R is valid in China region; 2) basic MUF prediction results based on China reference ionospheric model is better than that based on ITU-R reference ionospheric model in China region.