دورية أكاديمية
Ionospheric density depletions around crustal fields at Mars and their connection to ion frictional heating
| العنوان: | Ionospheric density depletions around crustal fields at Mars and their connection to ion frictional heating |
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| المؤلفون: | H. Madanian, T. Hesse, F. Duru, M. Pilinski, R. Frahm |
| المصدر: | Annales Geophysicae, Vol 42, Pp 69-78 (2024) |
| بيانات النشر: | Copernicus Publications, 2024. |
| سنة النشر: | 2024 |
| المجموعة: | LCC:Science LCC:Physics LCC:Geophysics. Cosmic physics |
| مصطلحات موضوعية: | Science, Physics, QC1-999, Geophysics. Cosmic physics, QC801-809 |
| الوصف: | Mars' ionosphere is formed through ionization of the neutral atmosphere by solar irradiance, charge exchange, and electron impact. Observations by the Mars Atmosphere and Volatile EvolutioN (MAVEN) spacecraft have shown a highly dynamic ionospheric layer at Mars impacted by loss processes including ion escape, transport, and electron recombination. The crustal fields at Mars can also significantly modulate the ionosphere. We use MAVEN data to perform a statistical analysis of density depletions of ionospheric species (O+, O2+, and electrons) around crustal fields. Events mostly occur when the crustal magnetic fields are radial, outward, and with a mild preference towards east in the planetocentric coordinates. We show that events near crustal fields are typically accompanied by an increase in suprathermal electrons within the depletion, either throughout the event or as a short-lived electron beam. However, no correlation between the changes in the bulk electron densities and suprathermal electron density variations is observed. Our analysis indicates that the temperature of the major ionospheric species, O2+, increases during most of the density depletion events, which could indicate that some ionospheric density depletions around crustal fields are a result of ion frictional heating. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 0992-7689 1432-0576 |
| Relation: | https://angeo.copernicus.org/articles/42/69/2024/angeo-42-69-2024.pdf; https://doaj.org/toc/0992-7689; https://doaj.org/toc/1432-0576 |
| DOI: | 10.5194/angeo-42-69-2024 |
| URL الوصول: | https://doaj.org/article/e3eeddcb9a54423487c1cdaf59326061 |
| رقم الأكسشن: | edsdoj.3eeddcb9a54423487c1cdaf59326061 |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 09927689 14320576 |
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| DOI: | 10.5194/angeo-42-69-2024 |