Dual site observations of dayside Doppler-shifted hydrogen profiles: preliminary results
Simultaneous optical ground-based observations of auroral Balmer excited hydrogen atoms were performed during the boreal winters of 2002–2003 and 2003–2004 at Ny-Ålesund, Svalbard (NYA 76.26°N 110.98°E geomagnetic) and Longyearbyen, Svalbard (LYR 75.31°N 111.88°E geomagnetic). Balmer α (H α ) with a...
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crcansciencepubl:10.1139/p08-026 2023-12-17T10:33:11+01:00 Dual site observations of dayside Doppler-shifted hydrogen profiles: preliminary results Holmes, J M Kozelov, B V Sigernes, F Lorentzen, D A Deehr, C S 2008 http://dx.doi.org/10.1139/p08-026 http://www.nrcresearchpress.com/doi/pdf/10.1139/p08-026 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Physics volume 86, issue 5, page 691-698 ISSN 0008-4204 1208-6045 General Physics and Astronomy journal-article 2008 crcansciencepubl https://doi.org/10.1139/p08-026 2023-11-19T13:38:29Z Simultaneous optical ground-based observations of auroral Balmer excited hydrogen atoms were performed during the boreal winters of 2002–2003 and 2003–2004 at Ny-Ålesund, Svalbard (NYA 76.26°N 110.98°E geomagnetic) and Longyearbyen, Svalbard (LYR 75.31°N 111.88°E geomagnetic). Balmer α (H α ) with a natural wavelength of 6563Å was detected at Ny-Ålesund, while Balmer β (H β ) at 4861Å was measured at Longyearbyen. The emissions are well known to originate from precipitating protons whose charge exchanges with the neutral atmosphere lead to a diffuse, Doppler-shifted emission region. Measurements are made using Ebert–Fastie spectrometers that are located 118 km apart on a line of roughly constant geomagnetic longitude, thus making this configuration suitable for studying the variation of proton energy with geomagnetic latitude, the so-called “velocity filter” effect. For two different days, analysis of the spectrometer data sets was performed, yielding in both cases positive energy differences between LYR and NYA in support of the velocity filter concept. To reduce uncertainties in the determined energies obtained from the Doppler profile, distributions of energy difference were constructed using the entire time period (up to 2 h) for each case.PACS Nos.: 92.60.hw 94.20.Ac, 94.30.Aa Article in Journal/Newspaper Longyearbyen Ny Ålesund Ny-Ålesund Svalbard Canadian Science Publishing (via Crossref) Svalbard Ny-Ålesund Longyearbyen Canadian Journal of Physics 86 5 691 698 |
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Open Polar |
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Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
General Physics and Astronomy |
spellingShingle |
General Physics and Astronomy Holmes, J M Kozelov, B V Sigernes, F Lorentzen, D A Deehr, C S Dual site observations of dayside Doppler-shifted hydrogen profiles: preliminary results |
topic_facet |
General Physics and Astronomy |
description |
Simultaneous optical ground-based observations of auroral Balmer excited hydrogen atoms were performed during the boreal winters of 2002–2003 and 2003–2004 at Ny-Ålesund, Svalbard (NYA 76.26°N 110.98°E geomagnetic) and Longyearbyen, Svalbard (LYR 75.31°N 111.88°E geomagnetic). Balmer α (H α ) with a natural wavelength of 6563Å was detected at Ny-Ålesund, while Balmer β (H β ) at 4861Å was measured at Longyearbyen. The emissions are well known to originate from precipitating protons whose charge exchanges with the neutral atmosphere lead to a diffuse, Doppler-shifted emission region. Measurements are made using Ebert–Fastie spectrometers that are located 118 km apart on a line of roughly constant geomagnetic longitude, thus making this configuration suitable for studying the variation of proton energy with geomagnetic latitude, the so-called “velocity filter” effect. For two different days, analysis of the spectrometer data sets was performed, yielding in both cases positive energy differences between LYR and NYA in support of the velocity filter concept. To reduce uncertainties in the determined energies obtained from the Doppler profile, distributions of energy difference were constructed using the entire time period (up to 2 h) for each case.PACS Nos.: 92.60.hw 94.20.Ac, 94.30.Aa |
format |
Article in Journal/Newspaper |
author |
Holmes, J M Kozelov, B V Sigernes, F Lorentzen, D A Deehr, C S |
author_facet |
Holmes, J M Kozelov, B V Sigernes, F Lorentzen, D A Deehr, C S |
author_sort |
Holmes, J M |
title |
Dual site observations of dayside Doppler-shifted hydrogen profiles: preliminary results |
title_short |
Dual site observations of dayside Doppler-shifted hydrogen profiles: preliminary results |
title_full |
Dual site observations of dayside Doppler-shifted hydrogen profiles: preliminary results |
title_fullStr |
Dual site observations of dayside Doppler-shifted hydrogen profiles: preliminary results |
title_full_unstemmed |
Dual site observations of dayside Doppler-shifted hydrogen profiles: preliminary results |
title_sort |
dual site observations of dayside doppler-shifted hydrogen profiles: preliminary results |
publisher |
Canadian Science Publishing |
publishDate |
2008 |
url |
http://dx.doi.org/10.1139/p08-026 http://www.nrcresearchpress.com/doi/pdf/10.1139/p08-026 |
geographic |
Svalbard Ny-Ålesund Longyearbyen |
geographic_facet |
Svalbard Ny-Ålesund Longyearbyen |
genre |
Longyearbyen Ny Ålesund Ny-Ålesund Svalbard |
genre_facet |
Longyearbyen Ny Ålesund Ny-Ålesund Svalbard |
op_source |
Canadian Journal of Physics volume 86, issue 5, page 691-698 ISSN 0008-4204 1208-6045 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/p08-026 |
container_title |
Canadian Journal of Physics |
container_volume |
86 |
container_issue |
5 |
container_start_page |
691 |
op_container_end_page |
698 |
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1785587102685069312 |