Some features of nighttime enhancements in the electron concentration in the F2-layer maximum of the midlatitude ionosphere

A. F. Yakovets, V. V. Vodyannikov, G. I. Gordienko, Yu. G. Litvinov

2014

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DOI 10.1134/s0016793214050181
Data confidence 70 medium
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Abstract

Using the data of vertical sounding of the ionosphere in Alma-Ata (76°55′ E, 43°15′ N) conducted in 2002–2012, the reaction of parameters of the ionospheric F 2 layer to various types of nighttime enhancements in the electron concentration in the maximum of the layer ( NmF 2) was studied, including the height of the maximum and bottom of the layer, its semithickness, and electron concentration at some fixed heights. Examples of recordings of a combination of the enhancements caused by different mechanisms are presented. The similarity of the reaction of the F 2-layer parameters to the nighttime enhancements caused by the rise of the layer and plasma flux from the protonosphere and passage of large-scale travelling ionospheric disturbances was found. Difficulties in identifying these two events in the case of their equal duration are noted. The difference in the reaction of the F 2-layer parameters to the enhancements caused by the rise of the layer and plasma fluxes from the protonosphere and occurrence of the summer midlatitude ionospheric anomaly is shown.