Determination of the hemispheric character (i.e. southern or northern latitudinal position) of equatorial ionosonde stations as deduced from long-term recordings of the minimum height of the F-region (h ' F)

Hajkowicz, LA (2002) Determination of the hemispheric character (i.e. southern or northern latitudinal position) of equatorial ionosonde stations as deduced from long-term recordings of the minimum height of the F-region (h ' F). Journal of Atmospheric And Solar-terrestrial Physics, 64 3: 307-313. doi:10.1016/S1364-6826(01)00112-2


Author Hajkowicz, LA
Title Determination of the hemispheric character (i.e. southern or northern latitudinal position) of equatorial ionosonde stations as deduced from long-term recordings of the minimum height of the F-region (h ' F)
Journal name Journal of Atmospheric And Solar-terrestrial Physics   Check publisher's open access policy
ISSN 1364-6826
Publication date 2002-01-01
Sub-type Article (original research)
DOI 10.1016/S1364-6826(01)00112-2
Volume 64
Issue 3
Start page 307
End page 313
Total pages 7
Editor Michael J Rycroft
T L Killeen
Place of publication United Kingdom
Publisher Pergamon
Collection year 2002
Language eng
Subject C1
240100 Astronomical Sciences
780102 Physical sciences
Abstract The virtual (or minimum) height of the F-region (h'F), recorded over a number of solar cycles for I I equatorial and mid-latitude ionosonde stations, was used to deduce the hemispheric (i.e. southern or northern hemisphere) character of equatorial stations. The semi-annual median monthly height (h'F) variations consist of two components: major local summer maximum and winter sub-maximum (about 5 percent of the summer maximum). This hemispheric pattern was most consistently observed for equatorial stations (within 5degrees of the geomagnetic equator) in a period centred on the local midnight (21-03 LT) but was also present, to a lesser extent, at mid-latitude stations and at other time intervals. It is evident that the physical parameter h'F defines the hemispheric character of an equatorial station which has different (sometimes opposite) geographic and geomagnetic latitudes. There is a sharp transition in the latitudinal character of the stations on both sides of the equator leading to hypothesis that the equal maxima in h'F in December and June solstices are observed at a near-equator position labelled as ionosonde deduced equator (IDE). Such a signature was observed for an American equatorial (both geographic and geomagnetic) station Talara (Peru) which is an experimental support of the hypothesis. The IDE can be another useful parameter characterising the equatorial ionosphere. This finding reveals a new application of the standard ionosonde data in defining the geophysical character of equatorial stations, being an important contribution to space climatology. (C) 2002 Elsevier Science Ltd. All rights reserved.
Keyword Geochemistry & Geophysics
Meteorology & Atmospheric Sciences
Equatorial Ionosphere
Ionosonde Parameters
Solar Cycle
Equator Definition
Ionospheric Response
Solar-cycle
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Physical Sciences Publications
 
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Created: Wed, 15 Aug 2007, 03:17:06 EST