A comparative study of the sunrise and sunset effects on the integrated field intensity of VLF atmospherics

A comparative study of the sunrise and sunset effects on the integrated field intensity of VLF atmospherics

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A comparative study is made of the stepped structure of atmospherics during sunrise and sunset hours at three harmonically related frequencies in the VLF band, observed at the coast of the Bay of Bengal. The occurrences of the steps, their duration, time sequence and amplitudes are critically ex...

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Main Authors: A. B. Bhattacharya, B. K. Datta, R. Bhattacharya
Format: Article
Language:English
Published: Copernicus Publications 1995-09-01
Series:Annales Geophysicae
Online Access:https://www.ann-geophys.net/13/976/1995/angeo-13-976-1995.pdf
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spelling doaj-3949208f77024346b5ca284803ce43d72020-11-25T00:45:53ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05761995-09-011397698010.1007/s00585-995-0976-0A comparative study of the sunrise and sunset effects on the integrated field intensity of VLF atmosphericsA. B. BhattacharyaB. K. DattaR. BhattacharyaA comparative study is made of the stepped structure of atmospherics during sunrise and sunset hours at three harmonically related frequencies in the VLF band, observed at the coast of the Bay of Bengal. The occurrences of the steps, their duration, time sequence and amplitudes are critically examined. Our analysis reveals that the start times of the third and second steps of the sunrise effect are always before ground sunrise, while the start of the main step is distributed on both sides of it. During sunset hours, the onset time of the main step is before the local ground sunset, but for the second and third steps, the onset times are after that. The results are interpreted by considering the multi-hop propagation as well as the distributed noise sources surrounding the observing site.https://www.ann-geophys.net/13/976/1995/angeo-13-976-1995.pdf
collection DOAJ
language English
format Article
sources DOAJ
author A. B. Bhattacharya
B. K. Datta
R. Bhattacharya
spellingShingle A. B. Bhattacharya
B. K. Datta
R. Bhattacharya
A comparative study of the sunrise and sunset effects on the integrated field intensity of VLF atmospherics
Annales Geophysicae
author_facet A. B. Bhattacharya
B. K. Datta
R. Bhattacharya
author_sort A. B. Bhattacharya
title A comparative study of the sunrise and sunset effects on the integrated field intensity of VLF atmospherics
title_short A comparative study of the sunrise and sunset effects on the integrated field intensity of VLF atmospherics
title_full A comparative study of the sunrise and sunset effects on the integrated field intensity of VLF atmospherics
title_fullStr A comparative study of the sunrise and sunset effects on the integrated field intensity of VLF atmospherics
title_full_unstemmed A comparative study of the sunrise and sunset effects on the integrated field intensity of VLF atmospherics
title_sort comparative study of the sunrise and sunset effects on the integrated field intensity of vlf atmospherics
publisher Copernicus Publications
series Annales Geophysicae
issn 0992-7689
1432-0576
publishDate 1995-09-01
description A comparative study is made of the stepped structure of atmospherics during sunrise and sunset hours at three harmonically related frequencies in the VLF band, observed at the coast of the Bay of Bengal. The occurrences of the steps, their duration, time sequence and amplitudes are critically examined. Our analysis reveals that the start times of the third and second steps of the sunrise effect are always before ground sunrise, while the start of the main step is distributed on both sides of it. During sunset hours, the onset time of the main step is before the local ground sunset, but for the second and third steps, the onset times are after that. The results are interpreted by considering the multi-hop propagation as well as the distributed noise sources surrounding the observing site.
url https://www.ann-geophys.net/13/976/1995/angeo-13-976-1995.pdf
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