Negative ions in the auroral mesosphere during a PCA event around sunset
International audience This is a study of the negative ion chemistry in the mesosphere above Tromsø using a number of EISCAT observations of high energy proton precipitation events during the last solar maximum, and in particular around sunset on 23 October, 1989. In these conditions it is possible...
Main Authors: | , , |
---|---|
Other Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
1999
|
Subjects: | |
Online Access: | https://hal.science/hal-00316610 https://hal.science/hal-00316610/document https://hal.science/hal-00316610/file/angeo-17-782-1999.pdf |
id |
ftccsdartic:oai:HAL:hal-00316610v1 |
---|---|
record_format |
openpolar |
spelling |
ftccsdartic:oai:HAL:hal-00316610v1 2023-11-12T04:16:37+01:00 Negative ions in the auroral mesosphere during a PCA event around sunset del Pozo, C. F. Turunen, E. Ulich, T. Department of Physics Okayama University Sodankyäl Geophysical Observatory 1999 https://hal.science/hal-00316610 https://hal.science/hal-00316610/document https://hal.science/hal-00316610/file/angeo-17-782-1999.pdf en eng HAL CCSD European Geosciences Union hal-00316610 https://hal.science/hal-00316610 https://hal.science/hal-00316610/document https://hal.science/hal-00316610/file/angeo-17-782-1999.pdf info:eu-repo/semantics/OpenAccess ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00316610 Annales Geophysicae, 1999, 17 (6), pp.782-793 [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 1999 ftccsdartic 2023-10-21T23:08:22Z International audience This is a study of the negative ion chemistry in the mesosphere above Tromsø using a number of EISCAT observations of high energy proton precipitation events during the last solar maximum, and in particular around sunset on 23 October, 1989. In these conditions it is possible to look at the relative importance of the various photodetachment and photodissociation processes controlling the concentration of negative ions. The data analysed are from several UHF GEN11 determinations of the ion-plasma ACF together with the pseudo zero-lag estimate of the `raw' electron density, at heights between 55 km and 85 km, at less than 1 km resolution. The power profiles from the UHF are combined with the 55-ion Sodankylä model to obtain consistent estimates of the electron density, the negative ion concentrations, and the average ion mass with height. The neutral concentrations and ion temperature are given by the MSIS90 model. These parameters are then used to compare the calculated widths of the ion-line with the GEN11 determinations. The ion-line spectrum gives information on the effects of negative ions below 70 km where they are dominant; the spectral width is almost a direct measure of the relative abundance of negative ions. Article in Journal/Newspaper EISCAT Sodankylä Tromsø Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Tromsø Sodankylä ENVELOPE(26.600,26.600,67.417,67.417) |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
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 del Pozo, C. F. Turunen, E. Ulich, T. Negative ions in the auroral mesosphere during a PCA event around sunset |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience This is a study of the negative ion chemistry in the mesosphere above Tromsø using a number of EISCAT observations of high energy proton precipitation events during the last solar maximum, and in particular around sunset on 23 October, 1989. In these conditions it is possible to look at the relative importance of the various photodetachment and photodissociation processes controlling the concentration of negative ions. The data analysed are from several UHF GEN11 determinations of the ion-plasma ACF together with the pseudo zero-lag estimate of the `raw' electron density, at heights between 55 km and 85 km, at less than 1 km resolution. The power profiles from the UHF are combined with the 55-ion Sodankylä model to obtain consistent estimates of the electron density, the negative ion concentrations, and the average ion mass with height. The neutral concentrations and ion temperature are given by the MSIS90 model. These parameters are then used to compare the calculated widths of the ion-line with the GEN11 determinations. The ion-line spectrum gives information on the effects of negative ions below 70 km where they are dominant; the spectral width is almost a direct measure of the relative abundance of negative ions. |
author2 |
Department of Physics Okayama University Sodankyäl Geophysical Observatory |
format |
Article in Journal/Newspaper |
author |
del Pozo, C. F. Turunen, E. Ulich, T. |
author_facet |
del Pozo, C. F. Turunen, E. Ulich, T. |
author_sort |
del Pozo, C. F. |
title |
Negative ions in the auroral mesosphere during a PCA event around sunset |
title_short |
Negative ions in the auroral mesosphere during a PCA event around sunset |
title_full |
Negative ions in the auroral mesosphere during a PCA event around sunset |
title_fullStr |
Negative ions in the auroral mesosphere during a PCA event around sunset |
title_full_unstemmed |
Negative ions in the auroral mesosphere during a PCA event around sunset |
title_sort |
negative ions in the auroral mesosphere during a pca event around sunset |
publisher |
HAL CCSD |
publishDate |
1999 |
url |
https://hal.science/hal-00316610 https://hal.science/hal-00316610/document https://hal.science/hal-00316610/file/angeo-17-782-1999.pdf |
long_lat |
ENVELOPE(26.600,26.600,67.417,67.417) |
geographic |
Tromsø Sodankylä |
geographic_facet |
Tromsø Sodankylä |
genre |
EISCAT Sodankylä Tromsø |
genre_facet |
EISCAT Sodankylä Tromsø |
op_source |
ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00316610 Annales Geophysicae, 1999, 17 (6), pp.782-793 |
op_relation |
hal-00316610 https://hal.science/hal-00316610 https://hal.science/hal-00316610/document https://hal.science/hal-00316610/file/angeo-17-782-1999.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782333701670043648 |