Allowance for the solar-magnetospheric connections in a problem of predicting the critical frequency of the subauroral ionosphere |
| |
Authors: | O M Barkhatova A S Smirnova and R I Ulybina |
| |
Institution: | (1) Radiophysical Research Institute, Nizhny Novgorod, Russia;(2) State Pedagogical University of Nizhny Novgorod, Nizhny Novgorod, Russia |
| |
Abstract: | The cause-and-effect relation between variations in the critical frequency of the F
2 subauroral ionospheric layer and the key solar-magnetospheric parameters is studied. The features of the dependence of the
critical frequency of the subauroral ionosphere on the value and components of the interplanetary magnetic field, the solar-wind
parameters, the X-ray and ultraviolet radiation intensities, the solar zenith angle, and the intensity of precipitation of
low-energy particles are established. Within the framework of this study, codes allowing one to solve the problems of predicting
the critical frequency of the ionosphere by the method of artificial neural networks has been developed. The neural-network
forecasting experiments reveal the characteristic times of the ionospheric response to magnetospheric disturbancs. The found
optimal architecture of the neural network allows us to predict the time series of the critical frequency of the high-latitude
ionosphere for the interval 0.5–3 h with an accuracy of up to 93%. The obtained linear and nonlinear dependences of the critical
frequency of the ionospheric F
2 layer on the geophysical parameters can be used for developing ionospheric models required for determining the maximum usable
frequency of HF radio communication.
Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 52, No. 2, pp. 109–117, February 2009. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|