# Electron production by solar Ly-{\\alpha} line radiation in the ionospheric D-region

Source: [Electron production by solar Ly-{\\alpha} line radiation in the ionospheric D-region](<https://www.sota2.com/research/paper/68fa35da1e209131ce8a5478>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-24T21:30:48.084Z

Authors: Aleksandra Nina, Vladimir M. \\v{C}ade\\v{z}

Published: 2014-03-06T13:56:22.000Z

## Abstract

The hydrogen Ly-{\\alpha} line has a dominant influence in photo-ionization processes in the unperturbed terrestrial ionospheric D region. In this paper, we present a procedure of calculating the rate of photo-ionization induced by Ly-{\\alpha} photons based on relaxation of electron density after intensive perturbations like those caused by solar X flares. This theory is applied to the ends of relaxation periods following three cases of solar X flares from May 5, 2010, February 18, 2011 and March 24, 2011. The necessary data on low ionospheric plasma parameters were collected by the very low frequency (VLF) radio-wave technics. The electron concentration is calculated from the amplitude and phase of the VLF signal emitted by the DHO transmitter in Germany and recorded by a receiver located in Serbia.

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/1403.1443>)

[PDF](<https://arxiv.org/pdf/1403.1443.pdf>)