19 November 2015 The effects of space weather for HF propagation in the period of solar flare on 25 February 2014
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Proceedings Volume 9680, 21st International Symposium Atmospheric and Ocean Optics: Atmospheric Physics; 96805G (2015) https://doi.org/10.1117/12.2203592
Event: XXI International Symposium Atmospheric and Ocean Optics. Atmospheric Physics, 2015, Tomsk, Russian Federation
Abstract
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.
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S. N. Ponomarchuk, S. N. Ponomarchuk, V. I. Kurkin, V. I. Kurkin, N. M. Polekh, N. M. Polekh, A. V. Podlesniy, A. V. Podlesniy, N. A. Zolotukhina, N. A. Zolotukhina, E. B. Romanova, E. B. Romanova, } "The effects of space weather for HF propagation in the period of solar flare on 25 February 2014", Proc. SPIE 9680, 21st International Symposium Atmospheric and Ocean Optics: Atmospheric Physics, 96805G (19 November 2015); doi: 10.1117/12.2203592; https://doi.org/10.1117/12.2203592
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