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Vertical Variations in Thermospheric O/N2 and the Relationship Between O and N2 Perturbations During a Geomagnetic Storm

التفاصيل البيبلوغرافية
العنوان: Vertical Variations in Thermospheric O/N2 and the Relationship Between O and N2 Perturbations During a Geomagnetic Storm
المؤلفون: Tingting Yu, Wenbin Wang, Zhipeng Ren, Xuguang Cai, Maosheng He
المصدر: Earth and Space Science, Vol 10, Iss 10, Pp n/a-n/a (2023)
بيانات النشر: American Geophysical Union (AGU), 2023.
سنة النشر: 2023
المجموعة: LCC:Astronomy
LCC:Geology
مصطلحات موضوعية: vertical variations, O/N2 volume density ratio, storm, TIEGCM, constant pressure level, Astronomy, QB1-991, Geology, QE1-996.5
الوصف: Abstract The ratio of O to N2 number densities (O/N2) at different altitudes is an important parameter in describing thermospheric neutral composition changes and their effects on the ionosphere during geomagnetic storms. However, storm‐induced vertical variations in O/N2 and its dependence on the O and N2 perturbations are still not fully understood. Here, the Thermosphere/Ionosphere Electrodynamics General Circulation Model simulations were used to investigate the responses of thermospheric composition at different pressure levels to the super geomagnetic storm occurred on November 20 and 21 in 2003. Our analysis shows that the behaviors of O/N2 perturbations on different pressure levels are similar above ∼180 km altitude. In the middle and low thermosphere of below ∼300 km, the storm‐time O/N2 decrease is mainly caused by a large reduction of O number density. However, N2 enhancement plays a vital role in O/N2 decreases in the upper thermosphere. The O/N2 enhancement is mainly attributed to the N2 decreases at all pressure levels. The changes of O and N2 number densities at a constant pressure level can be explained by the perturbations of their mass mixing ratio (mmr) and total mass density (ρ). The regions of the O/N2 decrease are characterized by the O mmr decrease and N2 mmr enhancement, whereas the regions of the O/N2 increase are characterized by the O mmr increase and N2 mmr decrease. The ρ value that shows the decrease globally at most pressure levels during the storm either enhance or reduce the O and N2 perturbations.
نوع الوثيقة: article
وصف الملف: electronic resource
اللغة: English
تدمد: 2333-5084
Relation: https://doaj.org/toc/2333-5084
DOI: 10.1029/2023EA002988
URL الوصول: https://doaj.org/article/2b5cfeda3a6148da88a07d2affc83339
رقم الأكسشن: edsdoj.2b5cfeda3a6148da88a07d2affc83339
قاعدة البيانات: Directory of Open Access Journals
الوصف
تدمد:23335084
DOI:10.1029/2023EA002988