Irregular structures observed below 71 km in the night-time polar D-region
A new rocket range, SvalRak, was opened in November 1997 at Ny-Ålesund (79°N) in the Svalbard archipelago. The first instrumented rocket was launched on 20 November, 1997, at 1730 UT during geomagnetically quiet conditions. The payload was instrumented to measure plasma parameters in the mesosphere...
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ftdoajarticles:oai:doaj.org/article:71dd2f2599fc4802bb42abb8a5008424 2023-05-15T17:48:28+02:00 Irregular structures observed below 71 km in the night-time polar D-region E. V. Thrane T. A. Blix K. R. Svenes 2000-02-01T00:00:00Z https://doi.org/10.1007/s00585-000-0215-7 https://doaj.org/article/71dd2f2599fc4802bb42abb8a5008424 EN eng Copernicus Publications https://www.ann-geophys.net/18/215/2000/angeo-18-215-2000.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.1007/s00585-000-0215-7 0992-7689 1432-0576 https://doaj.org/article/71dd2f2599fc4802bb42abb8a5008424 Annales Geophysicae, Vol 18, Pp 215-222 (2000) Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 article 2000 ftdoajarticles https://doi.org/10.1007/s00585-000-0215-7 2022-12-31T02:53:25Z A new rocket range, SvalRak, was opened in November 1997 at Ny-Ålesund (79°N) in the Svalbard archipelago. The first instrumented rocket was launched on 20 November, 1997, at 1730 UT during geomagnetically quiet conditions. The payload was instrumented to measure plasma parameters in the mesosphere and lower thermosphere, but the payload only reached an altitude of 71 km. This resulted in a very flat trajectory through the lower D-region. The positive ion concentrations were larger than expected, and some unexpected plasma irregularities were observed below 71 km. The irregularities were typically 100 m in spatial extent, with plasma densities a factor of two to five above the ambient background. In the dark polar night the plasma below 71 km must consist mainly of positive and negative ions and the only conceivable ionising radiation is a flux of energetic particles. Furthermore only relativistic electrons have the large energies and the small gyro radii required in order to explain the observed spatial structure. The source of these electrons is uncertain. Key words: Ionosphere (ionospheric irregularities; ionization mechanisms) - Magnetospheric physics (polar cap phenomena) Article in Journal/Newspaper Ny Ålesund Ny-Ålesund polar night Svalbard Directory of Open Access Journals: DOAJ Articles Svalbard Ny-Ålesund Svalbard Archipelago Annales Geophysicae 18 2 215 222 |
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 E. V. Thrane T. A. Blix K. R. Svenes Irregular structures observed below 71 km in the night-time polar D-region |
topic_facet |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
description |
A new rocket range, SvalRak, was opened in November 1997 at Ny-Ålesund (79°N) in the Svalbard archipelago. The first instrumented rocket was launched on 20 November, 1997, at 1730 UT during geomagnetically quiet conditions. The payload was instrumented to measure plasma parameters in the mesosphere and lower thermosphere, but the payload only reached an altitude of 71 km. This resulted in a very flat trajectory through the lower D-region. The positive ion concentrations were larger than expected, and some unexpected plasma irregularities were observed below 71 km. The irregularities were typically 100 m in spatial extent, with plasma densities a factor of two to five above the ambient background. In the dark polar night the plasma below 71 km must consist mainly of positive and negative ions and the only conceivable ionising radiation is a flux of energetic particles. Furthermore only relativistic electrons have the large energies and the small gyro radii required in order to explain the observed spatial structure. The source of these electrons is uncertain. Key words: Ionosphere (ionospheric irregularities; ionization mechanisms) - Magnetospheric physics (polar cap phenomena) |
format |
Article in Journal/Newspaper |
author |
E. V. Thrane T. A. Blix K. R. Svenes |
author_facet |
E. V. Thrane T. A. Blix K. R. Svenes |
author_sort |
E. V. Thrane |
title |
Irregular structures observed below 71 km in the night-time polar D-region |
title_short |
Irregular structures observed below 71 km in the night-time polar D-region |
title_full |
Irregular structures observed below 71 km in the night-time polar D-region |
title_fullStr |
Irregular structures observed below 71 km in the night-time polar D-region |
title_full_unstemmed |
Irregular structures observed below 71 km in the night-time polar D-region |
title_sort |
irregular structures observed below 71 km in the night-time polar d-region |
publisher |
Copernicus Publications |
publishDate |
2000 |
url |
https://doi.org/10.1007/s00585-000-0215-7 https://doaj.org/article/71dd2f2599fc4802bb42abb8a5008424 |
geographic |
Svalbard Ny-Ålesund Svalbard Archipelago |
geographic_facet |
Svalbard Ny-Ålesund Svalbard Archipelago |
genre |
Ny Ålesund Ny-Ålesund polar night Svalbard |
genre_facet |
Ny Ålesund Ny-Ålesund polar night Svalbard |
op_source |
Annales Geophysicae, Vol 18, Pp 215-222 (2000) |
op_relation |
https://www.ann-geophys.net/18/215/2000/angeo-18-215-2000.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.1007/s00585-000-0215-7 0992-7689 1432-0576 https://doaj.org/article/71dd2f2599fc4802bb42abb8a5008424 |
op_doi |
https://doi.org/10.1007/s00585-000-0215-7 |
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Annales Geophysicae |
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18 |
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2 |
container_start_page |
215 |
op_container_end_page |
222 |
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1766154537904635904 |