Properties of the Variability of the Maximum Density of the F2-Layer over Almaty at Different Levels of Solar and Geomagnetic Activity

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Resumo

The properties of the variability of the maximum density of the F2-layer Nm at different levels of
solar and geomagnetic activity have been analyzed based on hourly data of the Almaty station (43.2° N, 104° E)
for 1958–1988. The standard deviation σ(x) of the fluctuations of Nm relative to the quiet level
(x = (Nm/Nm0 – 1) × 100, %) and the average shift of these fluctuations xave are used to characterize this
variability. In this path, an empirical model of the F2-layer maximum density Nm0 for low geomagnetic activity
has been created. It has been found that the variability of Nm depends weakly on the level of solar activity.
The dependence of the variability of Nm on geomagnetic activity is one of the main ones, along with the
dependences of this variability on time of day and season. In general, the variance σ2(x) is smaller for quiet
conditions than for periods of high geomagnetic activity. However, during periods of high geomagnetic activity,
a further increase in geomagnetic activity does not lead to an increase in the variance σ2(x). The saturation
in the increase in the variance σ2(x) against the background of a continuing increase in geomagnetic activity
and the absence of this saturation for the average shift xave seems to be a stable property of the variability of
the mid-latitude ionosphere during periods of geomagnetic storms. This conclusion is based on an additional
analysis of ionospheric variability according to data from the Irkutsk and Yamagawa stations, which are
located about 10 degrees north and south of Almaty station, respectively.

Sobre autores

M. Deminov

Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation, Russian Academy of Sciences
(IZMIRAN)

Email: deminov@izmiran.ru
Moscow, Russia

G. Deminova

Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation, Russian Academy of Sciences
(IZMIRAN)

Email: deminov@izmiran.ru
Moscow, Russia

V. Depuev

Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation, Russian Academy of Sciences
(IZMIRAN)

Email: deminov@izmiran.ru
Moscow, Russia

A. Depueva

Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation, Russian Academy of Sciences
(IZMIRAN)

Autor responsável pela correspondência
Email: deminov@izmiran.ru
Moscow, Russia

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Declaração de direitos autorais © М.Г. Деминов, Г.Ф. Деминова, В.Х. Депуев, А.Х. Депуева, 2023