We suggest a technique for the semi-automatic registration of medium-scale traveling ionospheric disturbances (MS TID) by the Z-shaped disturbances on the upper beam of the oblique-incidence sounding (OIS) ionogram. We test the method for a quiet day of March 26, 2017. We compare the cases of MS TID registration and registration of large-scale traveling ionospheric disturbances (LS TID) defined by variations of maximum observed frequencies.
Using data of the network of chirp sounding radio paths at middle and subauroral latitudes of the Asian region of Russia, we investigated peculiarities of manifestation of medium-scale traveling ionospheric disturbances (MS TIDs) over the Asian region of Russia during solar cycle 24. Typical seasonal dependencies and daily variations in probability of MS TID occurrence and their registration time on one hop radio paths of different directions have been revealed.
The methods for determining and correction of ionosphere parameters by real-time data of vertical and backscatter data sounding (VS and BS) by continuous chirp signal are presented. The input data are forecast ionosphere parameters and processing and interpretation results for VS and BS ionograms: VS height-frequency characteristic (HFC) and the leading edge of backscatter signal. On the base of the leading edge of BS signal one can calculate VS HFC for given points on the sphere in the sounding sector. On the base of HFC tracks the counting of ionosphere parameters is carried out. On the base extrapolation of the ratio of real to forecast values of ionosphere layer critical frequencies with account of layer geometrical parameters the correction of ionosphere parameters in given sphere points is carried out.
In this study, we analyze a specific type of propagation of decameter radio waves connected with lateral reflections of radio signals from ionospheric irregularities at the F-region altitudes. This feature is appeared in registration at the distance-frequency characteristics (ionograms) flat tracks with group paths exceeding ones for standard reflections from F2-region altitudes and maximum observed frequencies (MOF) exceeding MOF1F2. Non-great-circle HF radio signals propagation is considered for the Dikson – Norilsk, Amderma – Norilsk, and Salekhard – Norilsk paths using ionograms obtained in January and April 2016. 79 events of NGC-reflections during the studied period were registered. Among them, 45 events were observed in evening and night hours. Other NGC-events were registered in the day time.
In this work, the morphological investigation of maximum observed frequencies (MOF) and delays of interlayer signal over latitudinal path Khabarovsk – Tory in February 2014, has been carried out. Along with MOF and delays of regular 1F, 2F, 2E modes of high-frequency propagation we registered parameters of 1FN and 2Es modes. As a result of our study, we conclude that the interlayer signal is registered most often in the day time. This is connected with the E layer presence. At night time registration of 1FN mode is stipulated with the Es-layer presence over the decameter wave signal propagation path. Wave-like variations of MOF1FN and MOF2Es are registered on February 24 and February 28, 2014.
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