Self-consistent modelling of the daytime electron density profile in the ionospheric F region
International audience A theoretical self-consistent method for the description of daytime N e (h) profiles in the ionospheric F region measured by EISCAT is proposed. It is based on the use of a theoretical F-region model and measured electron density, N e (h) , electron, T e (h) , and ion temperat...
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ftinsu:oai:HAL:hal-00316208v1 2023-11-12T04:16:35+01:00 Self-consistent modelling of the daytime electron density profile in the ionospheric F region Mikhailov, A. Schlegel, K. Max-Planck-Institut für Aeronomie (MPI Aeronomie) Max-Planck-Gesellschaft Fedorov Institute of Applied Geophysics (IGA) Russian Federal Service for Hydrometeorology and Environmental Monitoring (Roshydromet) 1997 https://hal.science/hal-00316208 https://hal.science/hal-00316208/document https://hal.science/hal-00316208/file/angeo-15-314-1997.pdf en eng HAL CCSD European Geosciences Union hal-00316208 https://hal.science/hal-00316208 https://hal.science/hal-00316208/document https://hal.science/hal-00316208/file/angeo-15-314-1997.pdf info:eu-repo/semantics/OpenAccess ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00316208 Annales Geophysicae, 1997, 15 (3), pp.314-326 [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 1997 ftinsu 2023-10-25T16:25:42Z International audience A theoretical self-consistent method for the description of daytime N e (h) profiles in the ionospheric F region measured by EISCAT is proposed. It is based on the use of a theoretical F-region model and measured electron density, N e (h) , electron, T e (h) , and ion temperature, T i (h) , and field-aligned plasma drift V l (h) profiles. The method describes the observed N e (h) profile with high accuracy for quiet and disturbed conditions. Two versions of the method are considered: in the first the exospheric temperature T ex is derived from a procedure minimizing [log( N e (h) obs / N e (h) cal ] 2 , in the second T ex is deduced from the ion energy conservation in the F region. The method allows us to infer from the incoherent-scatter observations: concentrations of atomic oxygen, [O], molecular oxygen, [O 2 ], molecular nitrogen, [N 2 ] the vertical plasma drift, W , the exospheric temperature. T ex , and the shape parameter S in the neutral temperature profile. The ratio ([O + ]/ N e ) calculated by the theoretical model is used to correct T e (h), T i (h) and N e (h) profiles routinely measured with EISCAT which are known to depend strongly on the actual applied ion-composition model. Such a correction is especially important for geomagnetically disturbed periods when the F region is strongly enriched with molecular ions. We conclude that four of the six thermospheric parameters, namely [O], [N 2 ], W and T ex can be confidently inferred from the EISCAT observations, while the other two derived parameters, [O 2 ] ans S are less reliable. The method can be used for the analysis of long-term (seasonal, solar cycle) as well as for day-to-day variations of the thermospheric parameters and the F-region ion composition using daytime incoherent-scatter observations. Article in Journal/Newspaper EISCAT Institut national des sciences de l'Univers: HAL-INSU |
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Open Polar |
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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 Mikhailov, A. Schlegel, K. Self-consistent modelling of the daytime electron density profile in the ionospheric F region |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience A theoretical self-consistent method for the description of daytime N e (h) profiles in the ionospheric F region measured by EISCAT is proposed. It is based on the use of a theoretical F-region model and measured electron density, N e (h) , electron, T e (h) , and ion temperature, T i (h) , and field-aligned plasma drift V l (h) profiles. The method describes the observed N e (h) profile with high accuracy for quiet and disturbed conditions. Two versions of the method are considered: in the first the exospheric temperature T ex is derived from a procedure minimizing [log( N e (h) obs / N e (h) cal ] 2 , in the second T ex is deduced from the ion energy conservation in the F region. The method allows us to infer from the incoherent-scatter observations: concentrations of atomic oxygen, [O], molecular oxygen, [O 2 ], molecular nitrogen, [N 2 ] the vertical plasma drift, W , the exospheric temperature. T ex , and the shape parameter S in the neutral temperature profile. The ratio ([O + ]/ N e ) calculated by the theoretical model is used to correct T e (h), T i (h) and N e (h) profiles routinely measured with EISCAT which are known to depend strongly on the actual applied ion-composition model. Such a correction is especially important for geomagnetically disturbed periods when the F region is strongly enriched with molecular ions. We conclude that four of the six thermospheric parameters, namely [O], [N 2 ], W and T ex can be confidently inferred from the EISCAT observations, while the other two derived parameters, [O 2 ] ans S are less reliable. The method can be used for the analysis of long-term (seasonal, solar cycle) as well as for day-to-day variations of the thermospheric parameters and the F-region ion composition using daytime incoherent-scatter observations. |
author2 |
Max-Planck-Institut für Aeronomie (MPI Aeronomie) Max-Planck-Gesellschaft Fedorov Institute of Applied Geophysics (IGA) Russian Federal Service for Hydrometeorology and Environmental Monitoring (Roshydromet) |
format |
Article in Journal/Newspaper |
author |
Mikhailov, A. Schlegel, K. |
author_facet |
Mikhailov, A. Schlegel, K. |
author_sort |
Mikhailov, A. |
title |
Self-consistent modelling of the daytime electron density profile in the ionospheric F region |
title_short |
Self-consistent modelling of the daytime electron density profile in the ionospheric F region |
title_full |
Self-consistent modelling of the daytime electron density profile in the ionospheric F region |
title_fullStr |
Self-consistent modelling of the daytime electron density profile in the ionospheric F region |
title_full_unstemmed |
Self-consistent modelling of the daytime electron density profile in the ionospheric F region |
title_sort |
self-consistent modelling of the daytime electron density profile in the ionospheric f region |
publisher |
HAL CCSD |
publishDate |
1997 |
url |
https://hal.science/hal-00316208 https://hal.science/hal-00316208/document https://hal.science/hal-00316208/file/angeo-15-314-1997.pdf |
genre |
EISCAT |
genre_facet |
EISCAT |
op_source |
ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00316208 Annales Geophysicae, 1997, 15 (3), pp.314-326 |
op_relation |
hal-00316208 https://hal.science/hal-00316208 https://hal.science/hal-00316208/document https://hal.science/hal-00316208/file/angeo-15-314-1997.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782333648590077952 |