Modelling high-latitude electron densities with a coupled thermosphere-ionosphere model
International audience A few of the difficulties in accurately modelling high-latitude electron densities with a large-scale numerical model of the thermosphere and ionosphere are addressed by comparing electron densities calculated with the Coupled Thermosphere-Ionosphere Model (CTIM) to EISCAT dat...
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ftinsu:oai:HAL:hal-00316262v1 2023-11-12T04:16:35+01:00 Modelling high-latitude electron densities with a coupled thermosphere-ionosphere model Schoendorf, J. Aylward, A. D. Moffett, R. J. Atmospheric Physics Laboratory UCL London University College of London London (UCL) Upper Atmosphere Modelling Group (UAMG) University of Sheffield Sheffield 1996 https://hal.science/hal-00316262 https://hal.science/hal-00316262/document https://hal.science/hal-00316262/file/angeo-14-1391-1996.pdf en eng HAL CCSD European Geosciences Union hal-00316262 https://hal.science/hal-00316262 https://hal.science/hal-00316262/document https://hal.science/hal-00316262/file/angeo-14-1391-1996.pdf info:eu-repo/semantics/OpenAccess ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00316262 Annales Geophysicae, 1996, 14 (12), pp.1391-1402 [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 1996 ftinsu 2023-10-25T16:25:42Z International audience A few of the difficulties in accurately modelling high-latitude electron densities with a large-scale numerical model of the thermosphere and ionosphere are addressed by comparing electron densities calculated with the Coupled Thermosphere-Ionosphere Model (CTIM) to EISCAT data. Two types of simulations are presented. The first set of simulations consists of four diurnally reproducible model runs for a Kp index of 4o which differ only in the placement of the energetic-particle distribution and convection pattern input at high latitudes. These simulations predict varying amounts of agreement with the EISCAT data and illustrate that for a given Kp there is no unique solution at high-latitudes. Small changes in the high-latitude inputs cause dramatic changes in the high-latitude modelled densities. The second type of simulation consists of inputting statistical convection and particle precipitation patterns which shrink or grow as a function of Kp throughout a 3-day period 21?23 February 1990. Comparisons with the EISCAT data for the 3 days indicate that equatorward of the particle precipitation the model accurately simulates the data, while in the auroral zone there is more variability in the data than the model. Changing the high-latitude forcing as a function of Kp allows the CTIM to model the average behavior of the electron densities; however at auroral latitudes model spatial and temporal scales are too large to simulate the detailed variation seen in individual nights of data. Article in Journal/Newspaper EISCAT Institut national des sciences de l'Univers: HAL-INSU |
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 Schoendorf, J. Aylward, A. D. Moffett, R. J. Modelling high-latitude electron densities with a coupled thermosphere-ionosphere model |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience A few of the difficulties in accurately modelling high-latitude electron densities with a large-scale numerical model of the thermosphere and ionosphere are addressed by comparing electron densities calculated with the Coupled Thermosphere-Ionosphere Model (CTIM) to EISCAT data. Two types of simulations are presented. The first set of simulations consists of four diurnally reproducible model runs for a Kp index of 4o which differ only in the placement of the energetic-particle distribution and convection pattern input at high latitudes. These simulations predict varying amounts of agreement with the EISCAT data and illustrate that for a given Kp there is no unique solution at high-latitudes. Small changes in the high-latitude inputs cause dramatic changes in the high-latitude modelled densities. The second type of simulation consists of inputting statistical convection and particle precipitation patterns which shrink or grow as a function of Kp throughout a 3-day period 21?23 February 1990. Comparisons with the EISCAT data for the 3 days indicate that equatorward of the particle precipitation the model accurately simulates the data, while in the auroral zone there is more variability in the data than the model. Changing the high-latitude forcing as a function of Kp allows the CTIM to model the average behavior of the electron densities; however at auroral latitudes model spatial and temporal scales are too large to simulate the detailed variation seen in individual nights of data. |
author2 |
Atmospheric Physics Laboratory UCL London University College of London London (UCL) Upper Atmosphere Modelling Group (UAMG) University of Sheffield Sheffield |
format |
Article in Journal/Newspaper |
author |
Schoendorf, J. Aylward, A. D. Moffett, R. J. |
author_facet |
Schoendorf, J. Aylward, A. D. Moffett, R. J. |
author_sort |
Schoendorf, J. |
title |
Modelling high-latitude electron densities with a coupled thermosphere-ionosphere model |
title_short |
Modelling high-latitude electron densities with a coupled thermosphere-ionosphere model |
title_full |
Modelling high-latitude electron densities with a coupled thermosphere-ionosphere model |
title_fullStr |
Modelling high-latitude electron densities with a coupled thermosphere-ionosphere model |
title_full_unstemmed |
Modelling high-latitude electron densities with a coupled thermosphere-ionosphere model |
title_sort |
modelling high-latitude electron densities with a coupled thermosphere-ionosphere model |
publisher |
HAL CCSD |
publishDate |
1996 |
url |
https://hal.science/hal-00316262 https://hal.science/hal-00316262/document https://hal.science/hal-00316262/file/angeo-14-1391-1996.pdf |
genre |
EISCAT |
genre_facet |
EISCAT |
op_source |
ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00316262 Annales Geophysicae, 1996, 14 (12), pp.1391-1402 |
op_relation |
hal-00316262 https://hal.science/hal-00316262 https://hal.science/hal-00316262/document https://hal.science/hal-00316262/file/angeo-14-1391-1996.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782333641111633920 |