Effect of the solar activity variation on the Global Ionosphere Thermosphere Model (GITM)
| العنوان: | Effect of the solar activity variation on the Global Ionosphere Thermosphere Model (GITM) |
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| المؤلفون: | Günther March, Jan Thoemel, Davide Masutti, Aaron J. Ridley |
| المصدر: | Annales Geophysicae, Vol 34, Pp 725-736 (2016) |
| بيانات النشر: | Copernicus Publications, 2016. |
| سنة النشر: | 2016 |
| مصطلحات موضوعية: | Chemical process, Atmospheric Science, 010504 meteorology & atmospheric sciences, Meteorology, Population, Atmospheric sciences, 01 natural sciences, 0103 physical sciences, Earth and Planetary Sciences (miscellaneous), Boundary value problem, education, lcsh:Science, 010303 astronomy & astrophysics, 0105 earth and related environmental sciences, Physics, education.field_of_study, Atmospheric models, Payload, lcsh:QC801-809, Geology, Astronomy and Astrophysics, lcsh:QC1-999, lcsh:Geophysics. Cosmic physics, 13. Climate action, Space and Planetary Science, Drag, Physics::Space Physics, lcsh:Q, Astrophysics::Earth and Planetary Astrophysics, Thermosphere, Ionosphere, lcsh:Physics |
| الوصف: | The accuracy of global atmospheric models used to predict the middle/lower thermosphere characteristics is still an open topic. Uncertainties in the prediction of the gas properties in the thermosphere lead to inaccurate computations of the drag force on space objects (i.e. satellites or debris). Currently the lifetime of space objects and therefore the population of debris in low Earth orbit (LEO) cannot be quantified with a satisfactory degree of accuracy. In this paper, the Global Ionosphere Thermosphere Model (GITM) developed at the University of Michigan has been validated in order to provide detailed simulations of the thermosphere. First, a sensitivity analysis has been performed to investigate the effect of the boundary conditions on the final simulations results. Then, results of simulations have been compared with flight measurements from the CHallenging Minisatellite Payload (CHAMP) and Gravity Recovery and Climate Experiment (GRACE) satellites and with existing semi-empirical atmospheric models (IRI and MSIS). The comparison shows a linear dependency of the neutral density values with respect to the solar activity. In particular, GITM shows an over-predicting or under-predicting behaviour under high or low solar activity respectively. The reasons for such behaviour can be attributed to a wrong implementation of the chemical processes or the gas transport properties in the model. |
| وصف الملف: | application/pdf |
| اللغة: | English |
| تدمد: | 1432-0576 0992-7689 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f69c3b48efd827138563349547872f8b https://www.ann-geophys.net/34/725/2016/angeo-34-725-2016.pdf |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....f69c3b48efd827138563349547872f8b |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 14320576 09927689 |
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