High resolution measurements and modeling of auroral hydrogen emission line profiles
International audience 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 wi...
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ftinsu:oai:HAL:hal-00317129v1 2023-11-12T04:20:43+01:00 High resolution measurements and modeling of auroral hydrogen emission line profiles Lanchester, B. S. Galand, M. Robertson, S. C. Rees, M. H. Lummerzheim, D. Furniss, I. Peticolas, L. M. Frey, H. U. Baumgardner, J. Mendillo, M. University of Southampton Center for Space Physics Boston (CSP) Boston University Boston (BU) Geophysical Institute University College of London London (UCL) Space Sciences Laboratory Berkeley (SSL) University of California Berkeley (UC Berkeley) University of California (UC)-University of California (UC) 2003 https://hal.science/hal-00317129 https://hal.science/hal-00317129/document https://hal.science/hal-00317129/file/angeo-21-1629-2003.pdf en eng HAL CCSD European Geosciences Union hal-00317129 https://hal.science/hal-00317129 https://hal.science/hal-00317129/document https://hal.science/hal-00317129/file/angeo-21-1629-2003.pdf info:eu-repo/semantics/OpenAccess ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00317129 Annales Geophysicae, 2003, 21 (7), pp.1629-1643 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2003 ftinsu 2023-10-25T16:25:22Z International audience 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. Article in Journal/Newspaper Longyearbyen Svalbard Institut national des sciences de l'Univers: HAL-INSU Longyearbyen Svalbard |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Lanchester, B. S. Galand, M. Robertson, S. C. Rees, M. H. Lummerzheim, D. Furniss, I. Peticolas, L. M. Frey, H. U. Baumgardner, J. Mendillo, M. High resolution measurements and modeling of auroral hydrogen emission line profiles |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience 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. |
author2 |
University of Southampton Center for Space Physics Boston (CSP) Boston University Boston (BU) Geophysical Institute University College of London London (UCL) Space Sciences Laboratory Berkeley (SSL) University of California Berkeley (UC Berkeley) University of California (UC)-University of California (UC) |
format |
Article in Journal/Newspaper |
author |
Lanchester, B. S. Galand, M. Robertson, S. C. Rees, M. H. Lummerzheim, D. Furniss, I. Peticolas, L. M. Frey, H. U. Baumgardner, J. Mendillo, M. |
author_facet |
Lanchester, B. S. Galand, M. Robertson, S. C. Rees, M. H. Lummerzheim, D. Furniss, I. Peticolas, L. M. Frey, H. U. Baumgardner, J. Mendillo, M. |
author_sort |
Lanchester, B. S. |
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 |
HAL CCSD |
publishDate |
2003 |
url |
https://hal.science/hal-00317129 https://hal.science/hal-00317129/document https://hal.science/hal-00317129/file/angeo-21-1629-2003.pdf |
geographic |
Longyearbyen Svalbard |
geographic_facet |
Longyearbyen Svalbard |
genre |
Longyearbyen Svalbard |
genre_facet |
Longyearbyen Svalbard |
op_source |
ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00317129 Annales Geophysicae, 2003, 21 (7), pp.1629-1643 |
op_relation |
hal-00317129 https://hal.science/hal-00317129 https://hal.science/hal-00317129/document https://hal.science/hal-00317129/file/angeo-21-1629-2003.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782336521923198976 |