High resolution measurements and modeling of auroral hydrogen emission line profiles
Measurements in the visible wavelength range at high spectral resolution (1.3 Å) have been made at Longyearbyen, Svalbard (15.8 E,78.2 N) during an interval of intense proton precipitation. The shape and Doppler shift of hydrogen Balmer beta line profiles have been compared with model line profiles,...
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ftdoajarticles:oai:doaj.org/article:11e310353cf94ef7933d5173e15c0f52 2023-05-15T17:08:30+02:00 High resolution measurements and modeling of auroral hydrogen emission line profiles B. S. Lanchester M. Galand S. C. Robertson M. H. Rees D. Lummerzheim I. Furniss L. M. Peticolas H. U. Frey J. Baumgardner M. Mendillo 2003-07-01T00:00:00Z https://doi.org/10.5194/angeo-21-1629-2003 https://doaj.org/article/11e310353cf94ef7933d5173e15c0f52 EN eng Copernicus Publications https://www.ann-geophys.net/21/1629/2003/angeo-21-1629-2003.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-21-1629-2003 0992-7689 1432-0576 https://doaj.org/article/11e310353cf94ef7933d5173e15c0f52 Annales Geophysicae, Vol 21, Pp 1629-1643 (2003) Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 article 2003 ftdoajarticles https://doi.org/10.5194/angeo-21-1629-2003 2022-12-31T15:53:16Z Measurements in the visible wavelength range at high spectral resolution (1.3 Å) have been made at Longyearbyen, Svalbard (15.8 E,78.2 N) during an interval of intense proton precipitation. The shape and Doppler shift of hydrogen Balmer beta line profiles have been compared with model line profiles, using as input ion energy spectra from almost coincident passes of the FAST and DMSP spacecraft. The comparison shows that the simulation contains the important physical processes that produce the profiles, and confirms that measured changes in the shape and peak wave-length of the hydrogen profiles are the result of changing energy input. This combination of high resolution measurements with modeling provides a method of estimating the incoming energy and changes in flux of precipitating protons over Svalbard, for given energy and pitch-angle distributions. Whereas for electron precipitation, information on the incident particles is derived from brightness and brightness ratios which require at least two spectral windows, for proton precipitation the Doppler profile of resulting hydrogen emission is directly related to the energy and energy flux of the incident energetic protons and can be used to gather information about the source region. As well as the expected Doppler shift to shorter wavelengths, the measured profiles have a significant red-shifted component, the result of upward flowing emitting hydrogen atoms. Key words. Ionosphere (auroral ionosphere; particle precipitation) – Magnetospheric physics (auroral phenomena) Article in Journal/Newspaper Longyearbyen Svalbard Directory of Open Access Journals: DOAJ Articles Longyearbyen Svalbard Annales Geophysicae 21 7 1629 1643 |
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 B. S. Lanchester M. Galand S. C. Robertson M. H. Rees D. Lummerzheim I. Furniss L. M. Peticolas H. U. Frey J. Baumgardner M. Mendillo High resolution measurements and modeling of auroral hydrogen emission line profiles |
topic_facet |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
description |
Measurements in the visible wavelength range at high spectral resolution (1.3 Å) have been made at Longyearbyen, Svalbard (15.8 E,78.2 N) during an interval of intense proton precipitation. The shape and Doppler shift of hydrogen Balmer beta line profiles have been compared with model line profiles, using as input ion energy spectra from almost coincident passes of the FAST and DMSP spacecraft. The comparison shows that the simulation contains the important physical processes that produce the profiles, and confirms that measured changes in the shape and peak wave-length of the hydrogen profiles are the result of changing energy input. This combination of high resolution measurements with modeling provides a method of estimating the incoming energy and changes in flux of precipitating protons over Svalbard, for given energy and pitch-angle distributions. Whereas for electron precipitation, information on the incident particles is derived from brightness and brightness ratios which require at least two spectral windows, for proton precipitation the Doppler profile of resulting hydrogen emission is directly related to the energy and energy flux of the incident energetic protons and can be used to gather information about the source region. As well as the expected Doppler shift to shorter wavelengths, the measured profiles have a significant red-shifted component, the result of upward flowing emitting hydrogen atoms. Key words. Ionosphere (auroral ionosphere; particle precipitation) – Magnetospheric physics (auroral phenomena) |
format |
Article in Journal/Newspaper |
author |
B. S. Lanchester M. Galand S. C. Robertson M. H. Rees D. Lummerzheim I. Furniss L. M. Peticolas H. U. Frey J. Baumgardner M. Mendillo |
author_facet |
B. S. Lanchester M. Galand S. C. Robertson M. H. Rees D. Lummerzheim I. Furniss L. M. Peticolas H. U. Frey J. Baumgardner M. Mendillo |
author_sort |
B. S. Lanchester |
title |
High resolution measurements and modeling of auroral hydrogen emission line profiles |
title_short |
High resolution measurements and modeling of auroral hydrogen emission line profiles |
title_full |
High resolution measurements and modeling of auroral hydrogen emission line profiles |
title_fullStr |
High resolution measurements and modeling of auroral hydrogen emission line profiles |
title_full_unstemmed |
High resolution measurements and modeling of auroral hydrogen emission line profiles |
title_sort |
high resolution measurements and modeling of auroral hydrogen emission line profiles |
publisher |
Copernicus Publications |
publishDate |
2003 |
url |
https://doi.org/10.5194/angeo-21-1629-2003 https://doaj.org/article/11e310353cf94ef7933d5173e15c0f52 |
geographic |
Longyearbyen Svalbard |
geographic_facet |
Longyearbyen Svalbard |
genre |
Longyearbyen Svalbard |
genre_facet |
Longyearbyen Svalbard |
op_source |
Annales Geophysicae, Vol 21, Pp 1629-1643 (2003) |
op_relation |
https://www.ann-geophys.net/21/1629/2003/angeo-21-1629-2003.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-21-1629-2003 0992-7689 1432-0576 https://doaj.org/article/11e310353cf94ef7933d5173e15c0f52 |
op_doi |
https://doi.org/10.5194/angeo-21-1629-2003 |
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Annales Geophysicae |
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21 |
container_issue |
7 |
container_start_page |
1629 |
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1643 |
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