Ionosphere response to the solar eclipse on 1 august 2008: Some results of vertical sounding

Heading: 
Space and Atmospheric Physics
1Emelyanov, LYa., 2Sklyarov, IB, 3Chernogor, LF
1Institute of Ionosphere of the NAS of Ukraine and MES of Ukraine, Kharkiv, Ukraine
2Institute of Ionosphere of the National Academy of Sciences of Ukraine and Ministry for Education and Sciences of Ukraine, Kharkiv, Ukraine
3V.N. Karazin National University of Kharkiv, Kharkiv, Ukraine
Kosm. nauka tehnol. 2009, 15 ;(4):12-21
https://doi.org/10.15407/knit2009.04.012
Publication Language: Russian
Abstract: 
The results of the ionosphere dynamics observation at heights of 100 to 200 km during the partial (the phase 0.42) solar eclipse on 1 August 2008 near Kharkiv are described. The solar eclipse caused some alteration of the ionosphere at all heights from at first the daily to nightly conditions and then to daily ones. Critical frequency decreased by 10 % for the F1‒layer and by 17 % for the F2‒layer. The delay of these variations in relation to the phase of the solar disk obscuration was 0 and 15 min, respectively. The virtual height of signal reflection near the maximum of the F2-layer ionization increased considerably (by 100‒200 km). Some decrease of electron density and amplification of quasi-periodic variations (with a period of about 75 min) during the solar eclipse at all the observable heights are fixed.
Keywords: electron density, ionization maximum, quasi-periodic variations
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