CONTRIBUTION OF SOLAR HYDROGEN Lyα LINE EMISSION IN TOTAL IONIZATION RATE IN IONOSPHERIC D-REGION DURING THE MAXIMUM OF SOLAR X-FLARE

Serbian Astronomical Journal

article

A. Nina¹  V. M. Cadez²  J. Bajceti´c³ 

[1] Institute of Physics, University of Belgrade Pregrevica 118;Astronomical Observatory;Department of Telecommunications and Information Science, University of Defence

关键词: solar-terrestrial relations;    Sun: activity;    Sun: flares;    Sun: X-rays;    gamma rays;   

DOI  :  10.2298/SAJ150828003N

来源: Astronomical Observatory, Department of Astronomy, Belgrade

【 摘 要 】

The solar Lyα line emission can be considered as the dominant source of ionization processes in the ionospheric D-region at altitudes above 70 km during unperturbed conditions. However, large sudden impacts of radiation in some other energy domains can also significantly influence the ionization rate and, in this paper, we present a study on the contribution of Lyα radiation to the ionization rate when the ionosphere is disturbed by solar X-flares. We give relevant analytical expressions and make calculations and numerical simulations for the low ionosphere using data collected by the VLF receiver located in Serbia for the VLF radio signal emitted by the DHO transmitter in Germany.

【 授权许可】

CC BY-NC-ND