Some effects in the geospace plasma during partial Solar eclipse of 1 august 2008 above Kharkiv. 1. The observation results

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Space and Atmospheric Physics
1Emelyanov, LYa., 1Lyashenko, MV, 2Chernogor, LF
1Institute of Ionosphere of the NAS of Ukraine and MES of Ukraine, Kharkiv, Ukraine
2V.N. Karazin National University of Kharkiv, Kharkiv, Ukraine
Kosm. nauka tehnol. 2009, 15 ;(3):70-81
https://doi.org/10.15407/knit2009.03.070
Publication Language: Russian
Abstract: 
Our observation results of some effects in the geospace plasma during the partial (phase about 0.42) solar eclipse (SE) on 1 August 2008 are presented. The experimental data were obtained using the incoherent scatter radar of the Institute of Ionosphere (near Kharkiv city). The SE caused a decrease of density in the F2 layer maximum by 32 %, a decrease in the critical frequency f0F2 by 17.5 %, and an increase in the maximum F2 layer height by 3 km. At heights from 290 to 680 km the electron density decreased by about 25 %. During SE a decrease in the electron and ion temperatures by 70-180 and 0–140 K, respectively, within the height range from 190 to 490 km was observed. Plasma transport velocity vertical component near the main SE phase decreased by 10–55 m/s in the height range 200–530 km. The relative density of the hydrogen ions at heights of 900 and 1200 km decreased by 10–20 % i n the moment of the main SE phase.
Keywords: electron, geospace plasma, ionosphere
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