The influence of solar spectral lines on electron concentration in terrestrial ionosphere

TL;DR

This study investigates how solar spectral lines influence electron concentration in Earth's ionosphere during solar flares by analyzing VLF signal variations and solar spectra data.

Contribution

It presents a comparative analysis of VLF signal variations and solar spectral lines during solar flares, highlighting their relationship with ionospheric electron density changes.

Findings

VLF signal amplitude and phase vary with solar flare activity.

Solar spectral line analysis correlates with electron concentration increases.

Data from 2011 April 22 solar flare supports the link between spectral lines and ionospheric changes.

Abstract

One of the methods of detection and analysis of solar flares is observing the time variations of certain solar spectral lines. During solar flares, a raise of electron concentration occurs in Earth's ionosphere which results in amplitude and phase variations of the recorded very low frequency (VLF) waves. We compared the data obtained by the analysis of recorded VLF signals and line spectra for different solar flares. In this paper we treated the DHO VLF signal transmitted from Germany at the frequency of 23.4 kHz recorded by the AWESOME system in Belgrade (Serbia) during solar flares in the period between 10:40 UT and 13:00 UT on 2011 April 22.