Solar-eclipse-induced perturbations at mid-latitude during the 21 August 2017 event
<p>A study of the response of some ionospheric parameters and their relationship in describing the behaviour of ionospheric mechanisms during the solar eclipse of 21 August 2017 is presented. Mid-latitude stations located along the eclipse path and with data available from the Global Ionospher...
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doaj-307805f31d864542b92620ac0de8165b2020-11-25T02:46:23ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762019-03-013717118210.5194/angeo-37-171-2019Solar-eclipse-induced perturbations at mid-latitude during the 21 August 2017 eventB. J. Adekoya0B. O. Adebesin1T. W. David2S. O. Ikubanni3S. J. Adebiyi4O. S. Bolaji5O. S. Bolaji6V. U. Chukwuma7Department of Physics, Olabisi Onabanjo University, P.M.B. 2002, Ago Iwoye, NigeriaSpace Weather Group, Department of Physical Sciences, Landmark University, P.M.B. 1001, Omu-Aran, Kwara State, NigeriaDepartment of Physics, Olabisi Onabanjo University, P.M.B. 2002, Ago Iwoye, NigeriaSpace Weather Group, Department of Physical Sciences, Landmark University, P.M.B. 1001, Omu-Aran, Kwara State, NigeriaSpace Weather Group, Department of Physical Sciences, Landmark University, P.M.B. 1001, Omu-Aran, Kwara State, NigeriaDepartment of Physics, University of Lagos, Akoka, Yaba, Lagos, NigeriaDepartment of Physics, University of Tasmania, Hobart, AustraliaDepartment of Physics, Olabisi Onabanjo University, P.M.B. 2002, Ago Iwoye, Nigeria<p>A study of the response of some ionospheric parameters and their relationship in describing the behaviour of ionospheric mechanisms during the solar eclipse of 21 August 2017 is presented. Mid-latitude stations located along the eclipse path and with data available from the Global Ionospheric radio Observatory (GIRO) database were selected. The percentage of obscuration at these stations ranges between 63 % and 100 %. A decrease in electron density during the eclipse is attributed to a reduction in solar radiation and natural gas heating. The maximum magnitude of the eclipse consistently coincided with a <i>hmF2</i> increase and with a lagged maximum decrease in <i>NmF2</i> at the stations investigated. The results revealed that the horizontal neutral wind flow is as a consequence of the changes in the thermospheric and diffusion processes. The unusual increase and decrease in the shape and thickness parameters during the eclipse period relative to the control days points to the perturbation caused by the solar eclipse. The relationships of the bottomside ionosphere and the <i>F2</i> layer parameters with respect to the scale height are shown in the present work as viable parameters for probing the topside ionosphere during the eclipse. Furthermore, this study shows that in addition to traditional ways of analysing the thermospheric composition and neutral wind flow, proper relation of standardized <i>NmF2</i> and <i>hmF2</i> can be conveniently used to describe the mechanisms.</p>https://www.ann-geophys.net/37/171/2019/angeo-37-171-2019.pdf |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
B. J. Adekoya B. O. Adebesin T. W. David S. O. Ikubanni S. J. Adebiyi O. S. Bolaji O. S. Bolaji V. U. Chukwuma |
spellingShingle |
B. J. Adekoya B. O. Adebesin T. W. David S. O. Ikubanni S. J. Adebiyi O. S. Bolaji O. S. Bolaji V. U. Chukwuma Solar-eclipse-induced perturbations at mid-latitude during the 21 August 2017 event Annales Geophysicae |
author_facet |
B. J. Adekoya B. O. Adebesin T. W. David S. O. Ikubanni S. J. Adebiyi O. S. Bolaji O. S. Bolaji V. U. Chukwuma |
author_sort |
B. J. Adekoya |
title |
Solar-eclipse-induced perturbations at mid-latitude during the 21 August 2017 event |
title_short |
Solar-eclipse-induced perturbations at mid-latitude during the 21 August 2017 event |
title_full |
Solar-eclipse-induced perturbations at mid-latitude during the 21 August 2017 event |
title_fullStr |
Solar-eclipse-induced perturbations at mid-latitude during the 21 August 2017 event |
title_full_unstemmed |
Solar-eclipse-induced perturbations at mid-latitude during the 21 August 2017 event |
title_sort |
solar-eclipse-induced perturbations at mid-latitude during the 21 august 2017 event |
publisher |
Copernicus Publications |
series |
Annales Geophysicae |
issn |
0992-7689 1432-0576 |
publishDate |
2019-03-01 |
description |
<p>A study of the response of some ionospheric parameters and their relationship
in describing the behaviour of ionospheric mechanisms during the solar
eclipse of 21 August 2017 is presented. Mid-latitude stations located along
the eclipse path and with data available from the Global Ionospheric radio
Observatory (GIRO) database were selected. The percentage of obscuration at
these stations ranges between 63 % and 100 %. A decrease in electron
density during the eclipse is attributed to a reduction in solar radiation
and natural gas heating. The maximum magnitude of the eclipse consistently
coincided with a <i>hmF2</i> increase and with a lagged maximum decrease in
<i>NmF2</i> at the stations investigated. The results revealed that the
horizontal neutral wind flow is as a consequence of the changes in the
thermospheric and diffusion processes. The unusual increase and decrease in
the shape and thickness parameters during the eclipse period relative to the
control days points to the perturbation caused by the solar eclipse. The
relationships of the bottomside ionosphere and the <i>F2</i> layer
parameters with respect to the scale height are shown in the present work as
viable parameters for probing the topside ionosphere during the eclipse.
Furthermore, this study shows that in addition to traditional ways of
analysing the thermospheric composition and neutral wind flow, proper
relation of standardized <i>NmF2</i> and <i>hmF2</i> can be conveniently
used to describe the mechanisms.</p> |
url |
https://www.ann-geophys.net/37/171/2019/angeo-37-171-2019.pdf |
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