Spectral-polarization analysis of interval of pulsations of diminishing periods (IPDP), observed on November 9, 2017 at Istok observatory have been carried out. Pulsation characteristics calculated from five-minute sets of magnetic data are compared with changes in the intensities of 486.1, 557.7, and 630.0 nm emissions in the north, south, east, west, and zenith directions as well as with all-sky camera images and keograms made at the same wavelengths. It is shown that the frequency of the pulsations increased when regions of the intensified emissions expanded toward the equator. A possible relationship between the appearance of east-west elongated auroral arcs and the IPDP spectral composition is considered.
On the base of oblique sounding data from three paths located in Siberia and the Russian Far East, we analyzed probability of sporadic layer occurrence during stratospheric warmings in 2009–2013. The probability of sporadic layer occurrence has been shown to increase during stratospheric warmings, especially in years of low solar activity.
We carried out comparative analysis of the ionospheric, optic and geomagnetic disturbances observed during night hours of the main phase of the 17–18 March magnetic storm in the East Asian sector. It has been revealed that synchronous peaks of 557.7 and 630.0 nm emission intensity were associated with substorm-like enhancements of the westward electrojet. The strongest two peaks were observed during the shift of electrojet center to the corrected geomagnetic latitude φ’ ~ 55° N.
On the base of the space-distributed multipurpose chirp ionosonde effects of solar flare influence on conditions of HF signals distribution in the northeast region of Russia were registered on February 25, 2014. The absorption increase in D – ionosphere areas during flare due to splash in x-ray radiation was shown in disappearance of the signals corresponding to modes with multiple reflections from ionospheric layer both for the ionograms of oblique and vertical sounding. In the period of a magnetic storm on February 27, 2014 on the oblique sounding ionograms on paths Magadan – Irkutsk and Khabarovsk – Irkutsk in evening and night hours of local time, were observed additional signals with abnormally big delay. The amplitude relief of abnormal signals was characterized by strong diffusion, and frequencies exceeded the maximal observed frequencies of standard propagation modes.
KEYWORDS: Magnetism, Micro optical fluidics, Wave propagation, Radio propagation, Magnetosphere, Solar processes, Plasma, Atmospheric physics, Solar radiation models, Data modeling
The disturbances of ionospheric radio channel during 17–24 March 2015 magnetic storm are investigated. The heliospheric sources which caused the storm are considered. Based on space-distributed multipurpose chirp ionosonde data effects of geomagnetic disturbances influence on conditions of HF signal propagation are studied.
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