Geomagnetic control of polar mesosphere summer echoes
Using observations with the ALOMAR SOUSY radar near Andenes (69.3°N, 16.0°E) from 1994 until 1997 polar mesosphere summer echoes (PMSE) have been investigated in dependence on geomagnetic K indices derived at the Auroral Observatory Tromsø (69.66°N, 18.94°E). During night-time and morning hours a si...
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ftdoajarticles:oai:doaj.org/article:515384a156d940a38815f9e263ac8023 2023-05-15T13:25:17+02:00 Geomagnetic control of polar mesosphere summer echoes J. Bremer P. Hoffmann T. L. Hansen 2000-02-01T00:00:00Z https://doi.org/10.1007/s00585-000-0202-z https://doaj.org/article/515384a156d940a38815f9e263ac8023 EN eng Copernicus Publications https://www.ann-geophys.net/18/202/2000/angeo-18-202-2000.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.1007/s00585-000-0202-z 0992-7689 1432-0576 https://doaj.org/article/515384a156d940a38815f9e263ac8023 Annales Geophysicae, Vol 18, Pp 202-208 (2000) Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 article 2000 ftdoajarticles https://doi.org/10.1007/s00585-000-0202-z 2022-12-31T14:10:18Z Using observations with the ALOMAR SOUSY radar near Andenes (69.3°N, 16.0°E) from 1994 until 1997 polar mesosphere summer echoes (PMSE) have been investigated in dependence on geomagnetic K indices derived at the Auroral Observatory Tromsø (69.66°N, 18.94°E). During night-time and morning hours a significant correlation between the signal-to-noise ratio (SNR) of the radar results and the geomagnetic K indices could be detected with a maximum correlation near midnight. The correlation becomes markedly smaller in the afternoon and early evening hours with a minimum near 17 UT. This diurnal variation is in reasonable agreement with riometer absorption at Ivalo (68.55°N, 27.28°E) and can be explained by the diurnal variation of ionization due to precipitating high energetic particles. Therefore, a part of the diurnal PMSE variation is caused by this particle precipitation. The variability of the solar EUV variation, however, has no significant influence on the PMSE during the observation period. Keywords: Ionosphere (auroral ionosphere) - Magnetospheric physics (energetic particles, precipitating) - Radio science (remote sensing) Article in Journal/Newspaper Andenes Tromsø Directory of Open Access Journals: DOAJ Articles Tromsø Alomar ENVELOPE(-67.083,-67.083,-68.133,-68.133) Ivalo ENVELOPE(27.543,27.543,68.651,68.651) Annales Geophysicae 18 2 202 208 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
spellingShingle |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 J. Bremer P. Hoffmann T. L. Hansen Geomagnetic control of polar mesosphere summer echoes |
topic_facet |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
description |
Using observations with the ALOMAR SOUSY radar near Andenes (69.3°N, 16.0°E) from 1994 until 1997 polar mesosphere summer echoes (PMSE) have been investigated in dependence on geomagnetic K indices derived at the Auroral Observatory Tromsø (69.66°N, 18.94°E). During night-time and morning hours a significant correlation between the signal-to-noise ratio (SNR) of the radar results and the geomagnetic K indices could be detected with a maximum correlation near midnight. The correlation becomes markedly smaller in the afternoon and early evening hours with a minimum near 17 UT. This diurnal variation is in reasonable agreement with riometer absorption at Ivalo (68.55°N, 27.28°E) and can be explained by the diurnal variation of ionization due to precipitating high energetic particles. Therefore, a part of the diurnal PMSE variation is caused by this particle precipitation. The variability of the solar EUV variation, however, has no significant influence on the PMSE during the observation period. Keywords: Ionosphere (auroral ionosphere) - Magnetospheric physics (energetic particles, precipitating) - Radio science (remote sensing) |
format |
Article in Journal/Newspaper |
author |
J. Bremer P. Hoffmann T. L. Hansen |
author_facet |
J. Bremer P. Hoffmann T. L. Hansen |
author_sort |
J. Bremer |
title |
Geomagnetic control of polar mesosphere summer echoes |
title_short |
Geomagnetic control of polar mesosphere summer echoes |
title_full |
Geomagnetic control of polar mesosphere summer echoes |
title_fullStr |
Geomagnetic control of polar mesosphere summer echoes |
title_full_unstemmed |
Geomagnetic control of polar mesosphere summer echoes |
title_sort |
geomagnetic control of polar mesosphere summer echoes |
publisher |
Copernicus Publications |
publishDate |
2000 |
url |
https://doi.org/10.1007/s00585-000-0202-z https://doaj.org/article/515384a156d940a38815f9e263ac8023 |
long_lat |
ENVELOPE(-67.083,-67.083,-68.133,-68.133) ENVELOPE(27.543,27.543,68.651,68.651) |
geographic |
Tromsø Alomar Ivalo |
geographic_facet |
Tromsø Alomar Ivalo |
genre |
Andenes Tromsø |
genre_facet |
Andenes Tromsø |
op_source |
Annales Geophysicae, Vol 18, Pp 202-208 (2000) |
op_relation |
https://www.ann-geophys.net/18/202/2000/angeo-18-202-2000.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.1007/s00585-000-0202-z 0992-7689 1432-0576 https://doaj.org/article/515384a156d940a38815f9e263ac8023 |
op_doi |
https://doi.org/10.1007/s00585-000-0202-z |
container_title |
Annales Geophysicae |
container_volume |
18 |
container_issue |
2 |
container_start_page |
202 |
op_container_end_page |
208 |
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1766384495588540416 |