The southern-hemisphere mid-latitude day-time and night-time trough at low-sunspot numbers
The diurnal, seasonal, spatial and magnetic activity variations of the southern-hemisphere mid-latitude trough has been studied by using GPS and TOPEX satellite techniques during the low-sunspot number period of February 1995–February 1996. The ionospheric total electron content (TEC) values were ob...
Published in: | Journal of Atmospheric and Solar-Terrestrial Physics |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Pergamon Press
2003
|
Subjects: | |
Online Access: | https://espace.library.uq.edu.au/view/UQ:1444 |
id |
ftunivqespace:oai:espace.library.uq.edu.au:UQ:1444 |
---|---|
record_format |
openpolar |
spelling |
ftunivqespace:oai:espace.library.uq.edu.au:UQ:1444 2023-05-15T17:09:58+02:00 The southern-hemisphere mid-latitude day-time and night-time trough at low-sunspot numbers Horvath, I. Essex, E. A. 2003-05-01 https://espace.library.uq.edu.au/view/UQ:1444 eng eng Pergamon Press doi:10.1016/S1364-6826(03)00113-5 issn:1364-6826 orcid:0000-0002-1899-3907 Southern day- and night-time trough TEC build-up GPS TOPEX South Atlantic Magnetic Anomaly Neutral winds 08 Information and Computing Sciences Journal Article 2003 ftunivqespace https://doi.org/10.1016/S1364-6826(03)00113-5 2020-10-05T22:18:39Z The diurnal, seasonal, spatial and magnetic activity variations of the southern-hemisphere mid-latitude trough has been studied by using GPS and TOPEX satellite techniques during the low-sunspot number period of February 1995–February 1996. The ionospheric total electron content (TEC) values were obtained from the raw satellite data to observe the trough both locally in the Australian longitude region and globally over the world oceans. Various trough features were observed and investigated under different magnetic conditions, and were compared to the results of other researchers employing different techniques at Macquarie Island (−54.5°N; 154.95°E, geographic and the magnetic shell parameter (L) is 5.38). The ionization build-up on the equatorward trough wall, which has not been investigated since Foster (1993), is discussed in detail with the ΔTEC parameter utilized to characterize it. Some of the GPS findings were confirmed with the TOPEX results. Comparisons with the model generated TEC plots indicated that the model did not reproduce the trough. Several day-time and night-time global TOPEX TEC maps, showing also the geomagnetic and dip equators, were constructed for the season of the 1995 autumnal equinox to observe the trough globally, the first time in the literature, with other large-scale ionospheric formations. The magnetic alignment of these large-scale ionospheric formations is obvious. On the night-time maps the empirical position of the trough were plotted for various local time values at Kp=0 and 6, and indicated a very good agreement between the experimental and theoretical results. Article in Journal/Newspaper Macquarie Island The University of Queensland: UQ eSpace Journal of Atmospheric and Solar-Terrestrial Physics 65 8 917 940 |
institution |
Open Polar |
collection |
The University of Queensland: UQ eSpace |
op_collection_id |
ftunivqespace |
language |
English |
topic |
Southern day- and night-time trough TEC build-up GPS TOPEX South Atlantic Magnetic Anomaly Neutral winds 08 Information and Computing Sciences |
spellingShingle |
Southern day- and night-time trough TEC build-up GPS TOPEX South Atlantic Magnetic Anomaly Neutral winds 08 Information and Computing Sciences Horvath, I. Essex, E. A. The southern-hemisphere mid-latitude day-time and night-time trough at low-sunspot numbers |
topic_facet |
Southern day- and night-time trough TEC build-up GPS TOPEX South Atlantic Magnetic Anomaly Neutral winds 08 Information and Computing Sciences |
description |
The diurnal, seasonal, spatial and magnetic activity variations of the southern-hemisphere mid-latitude trough has been studied by using GPS and TOPEX satellite techniques during the low-sunspot number period of February 1995–February 1996. The ionospheric total electron content (TEC) values were obtained from the raw satellite data to observe the trough both locally in the Australian longitude region and globally over the world oceans. Various trough features were observed and investigated under different magnetic conditions, and were compared to the results of other researchers employing different techniques at Macquarie Island (−54.5°N; 154.95°E, geographic and the magnetic shell parameter (L) is 5.38). The ionization build-up on the equatorward trough wall, which has not been investigated since Foster (1993), is discussed in detail with the ΔTEC parameter utilized to characterize it. Some of the GPS findings were confirmed with the TOPEX results. Comparisons with the model generated TEC plots indicated that the model did not reproduce the trough. Several day-time and night-time global TOPEX TEC maps, showing also the geomagnetic and dip equators, were constructed for the season of the 1995 autumnal equinox to observe the trough globally, the first time in the literature, with other large-scale ionospheric formations. The magnetic alignment of these large-scale ionospheric formations is obvious. On the night-time maps the empirical position of the trough were plotted for various local time values at Kp=0 and 6, and indicated a very good agreement between the experimental and theoretical results. |
format |
Article in Journal/Newspaper |
author |
Horvath, I. Essex, E. A. |
author_facet |
Horvath, I. Essex, E. A. |
author_sort |
Horvath, I. |
title |
The southern-hemisphere mid-latitude day-time and night-time trough at low-sunspot numbers |
title_short |
The southern-hemisphere mid-latitude day-time and night-time trough at low-sunspot numbers |
title_full |
The southern-hemisphere mid-latitude day-time and night-time trough at low-sunspot numbers |
title_fullStr |
The southern-hemisphere mid-latitude day-time and night-time trough at low-sunspot numbers |
title_full_unstemmed |
The southern-hemisphere mid-latitude day-time and night-time trough at low-sunspot numbers |
title_sort |
southern-hemisphere mid-latitude day-time and night-time trough at low-sunspot numbers |
publisher |
Pergamon Press |
publishDate |
2003 |
url |
https://espace.library.uq.edu.au/view/UQ:1444 |
genre |
Macquarie Island |
genre_facet |
Macquarie Island |
op_relation |
doi:10.1016/S1364-6826(03)00113-5 issn:1364-6826 orcid:0000-0002-1899-3907 |
op_doi |
https://doi.org/10.1016/S1364-6826(03)00113-5 |
container_title |
Journal of Atmospheric and Solar-Terrestrial Physics |
container_volume |
65 |
container_issue |
8 |
container_start_page |
917 |
op_container_end_page |
940 |
_version_ |
1766066358876897280 |