The onset time interval of geomagnetic disturbances in the conjugate areas
The onset time interval of geomagnetic disturbances, as deduced from the numerous cases of rapid changes of K-indices over a cycle in solar activity, was studied for two conjugate auroral stations, Macquarie Island and College. There is a distinct peak in the occurrence number of the disturbances fo...
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Elsevier BV
1984
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ftunivqespace:oai:espace.library.uq.edu.au:UQ:393920 2023-05-15T17:04:10+02:00 The onset time interval of geomagnetic disturbances in the conjugate areas Hajkowicz L.A. 1984-01-01 https://espace.library.uq.edu.au/view/UQ:393920 eng eng Elsevier BV doi:10.1016/0032-0633(84)90004-7 issn:0032-0633 Space and Planetary Science Astronomy and Astrophysics 1908 Geophysics 1912 Space and Planetary Science 3103 Astronomy and Astrophysics Journal Article 1984 ftunivqespace https://doi.org/10.1016/0032-0633(84)90004-7 2020-12-22T12:09:52Z The onset time interval of geomagnetic disturbances, as deduced from the numerous cases of rapid changes of K-indices over a cycle in solar activity, was studied for two conjugate auroral stations, Macquarie Island and College. There is a distinct peak in the occurrence number of the disturbances for both stations at an interval 09.00-12.00 U.T., which is close to the local midnight at College but is in the pre-midnight sector at Macquarie Island. For comparison, a similar study was applied to the magnetic data obtained at two more auroral stations, Kiruna and Sodankyla. The onset time of the disturbances for these stations was most frequent at 18.00-21.00 U.T., centered at the conjugate midnight of Kiruna and Sodankyla in the Southern Hemisphere but well ahead of the local midnight of the stations themselves. The specific diurnal occurrences of the disturbances at all four auroral stations are consistent with a difference in the geometry between the southern and northern auroral ovals. It appears that the prevailing onset time of geomagnetic disturbances is associated with the time when both conjugate stations (or conjugate locations) are within the auroral oval and thus accessible to a direct particle influx from the Earth's magnetotail. Article in Journal/Newspaper Kiruna Macquarie Island The University of Queensland: UQ eSpace Kiruna Planetary and Space Science 32 7 819 823 |
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Open Polar |
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The University of Queensland: UQ eSpace |
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ftunivqespace |
language |
English |
topic |
Space and Planetary Science Astronomy and Astrophysics 1908 Geophysics 1912 Space and Planetary Science 3103 Astronomy and Astrophysics |
spellingShingle |
Space and Planetary Science Astronomy and Astrophysics 1908 Geophysics 1912 Space and Planetary Science 3103 Astronomy and Astrophysics Hajkowicz L.A. The onset time interval of geomagnetic disturbances in the conjugate areas |
topic_facet |
Space and Planetary Science Astronomy and Astrophysics 1908 Geophysics 1912 Space and Planetary Science 3103 Astronomy and Astrophysics |
description |
The onset time interval of geomagnetic disturbances, as deduced from the numerous cases of rapid changes of K-indices over a cycle in solar activity, was studied for two conjugate auroral stations, Macquarie Island and College. There is a distinct peak in the occurrence number of the disturbances for both stations at an interval 09.00-12.00 U.T., which is close to the local midnight at College but is in the pre-midnight sector at Macquarie Island. For comparison, a similar study was applied to the magnetic data obtained at two more auroral stations, Kiruna and Sodankyla. The onset time of the disturbances for these stations was most frequent at 18.00-21.00 U.T., centered at the conjugate midnight of Kiruna and Sodankyla in the Southern Hemisphere but well ahead of the local midnight of the stations themselves. The specific diurnal occurrences of the disturbances at all four auroral stations are consistent with a difference in the geometry between the southern and northern auroral ovals. It appears that the prevailing onset time of geomagnetic disturbances is associated with the time when both conjugate stations (or conjugate locations) are within the auroral oval and thus accessible to a direct particle influx from the Earth's magnetotail. |
format |
Article in Journal/Newspaper |
author |
Hajkowicz L.A. |
author_facet |
Hajkowicz L.A. |
author_sort |
Hajkowicz L.A. |
title |
The onset time interval of geomagnetic disturbances in the conjugate areas |
title_short |
The onset time interval of geomagnetic disturbances in the conjugate areas |
title_full |
The onset time interval of geomagnetic disturbances in the conjugate areas |
title_fullStr |
The onset time interval of geomagnetic disturbances in the conjugate areas |
title_full_unstemmed |
The onset time interval of geomagnetic disturbances in the conjugate areas |
title_sort |
onset time interval of geomagnetic disturbances in the conjugate areas |
publisher |
Elsevier BV |
publishDate |
1984 |
url |
https://espace.library.uq.edu.au/view/UQ:393920 |
geographic |
Kiruna |
geographic_facet |
Kiruna |
genre |
Kiruna Macquarie Island |
genre_facet |
Kiruna Macquarie Island |
op_relation |
doi:10.1016/0032-0633(84)90004-7 issn:0032-0633 |
op_doi |
https://doi.org/10.1016/0032-0633(84)90004-7 |
container_title |
Planetary and Space Science |
container_volume |
32 |
container_issue |
7 |
container_start_page |
819 |
op_container_end_page |
823 |
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1766058210490318848 |