Comparative Analysis of VLF Signal Variation along Trajectory Induced by X-ray Solar Flares

Comparative qualitative analysis of amplitude and phase delay variations was carried out along the trajectory of GQD/22.1 kHz and NAA/24.0 kHz VLF signal traces, propagating from Skelton (UK) and Maine (USA) toward Belgrade, induced by four isolated solar X-ray flare events occurred during the perio...

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Bibliographic Details
Published in:Journal of astrophysics and astronomy 2015-12, Vol.36 (4), p.565-579, Article 0
Main Authors: Kolarski, A., Grubor, D.
Format: Article
Language:English
Subjects:
Astronomy
Astrophysics and Astroparticles
Comparative analysis
Delay
Earth-ionosphere waveguide
Electromagnetism
Flares
Ionosphere
Observations and Techniques
Physics
Physics and Astronomy
Propagation
Qualitative analysis
Recording
Review
Solar flares
Trajectories
Wave propagation
X-rays
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Summary:Comparative qualitative analysis of amplitude and phase delay variations was carried out along the trajectory of GQD/22.1 kHz and NAA/24.0 kHz VLF signal traces, propagating from Skelton (UK) and Maine (USA) toward Belgrade, induced by four isolated solar X-ray flare events occurred during the period from September 2005 to December 2006. For monitoring, recording and for storage of VLF data at the Institute of Physics in Belgrade, Serbia, the AbsPAL system was used. For modeling purposes of propagating conditions along GQD and NAA signal propagation paths, LWPCv21 program code was used. Occurred solar flare events induced lower ionosphere electron density height profile changes, causing perturbations in VLF wave propagation within Earth-ionosphere waveguides. As analyzed VLF signals characterize by different propagation parameters along trajectories from their transmitters to the Belgrade receiver site, their propagation is affected in different ways for different solar flare events and also for the same solar flare events.
ISSN:0250-6335
0973-7758
DOI:10.1007/s12036-015-9361-x