Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2016, Vol. 13, No. 4, pp. 195-203
Amplitude and phase variations of VLF radio signals during the solar eclipse on 03/20/2015 registrated in Yakutsk and Ulan-Ude
V.I. Kozlov
1, 2 , A.A. Korsakov
1 , R.R. Karimov
1, 3 , V.V. Argunov
1 , V.P. Mel’chinov
2 , Yu.B. Bashkuev
4 , A.L. Boyarov
4 1 Yu.G. Shafer Institute of Cosmophysical Research and Aeronomy SB RAS, Yakutsk, Russia
2 Physical Technical Institute of the North-Eastern Federal University, Yakutsk, Russia
3 Physical Technical Institute of M.K. Ammosov North-Eastern Federal University, Yakutsk, Russia
4 Institute of Physical Material Science SB RAS, Ulan-Ude, Russia
Accepted: 27.08.2016
DOI: 10.21046/2070-7401-2016-13-11-195-203
The effect of solar eclipse of 20 March 2015 was manifested by amplitude increasing (23.7% daily variations) of the DHO signal (23.4 kHz) received in Yakutsk. It also was manifested by phase variations of the Krasnodar station signal (14.88 kHz) received in Yakutsk (0.39 radians) and Ulan-Ude (0.45 radians). Along paths of Krasnodar–Yakutsk and Krasnodar–Ulan-Ude, the distribution of the ratio between the open part of solar disk area during eclipse and total solar disk is presented. From VLF radio signal phase variation, a normalization coefficient was determined. The coefficient relates the change in the effective height of the Earth-ionosphere waveguide to the logarithm of the ratio of the flux of solar radiation during the eclipse to full daytime flux. For the Krasnodar–Yakutsk path, the normalization coefficient is 4.69±0.42 km. For the Krasnodar–Ulan-Ude path, the coefficient is 7.62±0.37 km. The night-to-day changes of the effective height of Krasnodar–Yakutsk waveguide was estimated at 21.6 km. For the Krasnodar–Ulan-Ude path the night-to-day changes were estimated at 35.1 km. For the maximum shading of Krasnodar–Yakutsk path, the maximum change of the Earth-ionosphere waveguide height was 2.88 km (eclipse phase 0.59). For the Krasnodar–Ulan-Ude path, the maximum waveguide height change was 2.43 km (eclipse phase 0.42).
Keywords: solar eclipse, radio wave propagation, D region of the ionosphere, effective height of the Earth-ionosphere waveguide
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