Short-term critical frequency variations and their predictions in the midlatitude ionospheric F2 region |
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| Institution: | 1. Institute of Acupuncture and Moxibustion of China Academy of Chinese Medical Sciences, Beijing 100700, China (1.中国中医科学院针灸研究所, 北京 100700 , 中国);2. Acupuncture and Moxibustion Hospital of China Academy of Chinese Medical Sciences, Beijing 100700, China (2.中国中医科学院针灸医院北京 100700, 中国) |
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| Abstract: | Short-term variations δf0F2 in the values of the critical frequency of the ionospheric F2 region in middle latitudes due to solar and geomagnetic activities have been investigated. Diurnal and seasonal features of the energy flow from the auroral into midlatitude ionosphere are revealed. It is shown that they could be taken into account if instead of the 3-hour geomagnetic indices or their daily averages a new index is employed which characterizes the average level of geomagnetic activity over intervals of time no less than nine hours usually during the evening and night hours. A technique for short-term predicting δf0F2 in the midlatitude ionosphere is developed which employs the indices of solar and geomagnetic activities, and errors in the predictions are estimated. |
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