کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8135322 | 1523518 | 2016 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Cometary sputtering of the Martian atmosphere during the Siding Spring encounter
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علوم فضا و نجوم
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چکیده انگلیسی
With the approach of the close encounter of comet Siding Spring with Mars, possible influences on the Martian atmosphere from the cometary coma are being explored. Here we describe the non-thermal atmospheric loss due to atmospheric sputtering produced by the impact of the coma material. We use an atmospheric sputtering model to simulate the effect of the incident neutral O and the pickup O+, produced by photodissociation of water and its products. With the relatively large encounter speed of 56Â km/s at a close flyby altitude of â¼130,000 km, the sputtering escape rates from the coma can reach 2-3 times the incident gas fluxes. Thus, the passing of the cometary coma will lead to removal of Martian atmosphere instead of mass loading. If the cometary outgassing rate reaches 1028sâ1, the sputtering from the extended coma could remove about 10Â tons of Martian gases and deposit about 1Â ton of external cometary material into the atmosphere during the one hour encounter. This implies that the cometary sputtering may have played a non-negligible role in Mars atmospheric evolution when this kind of cometary encounter may occur frequently in early Martian epochs.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Icarus - Volume 272, 1 July 2016, Pages 301-308
Journal: Icarus - Volume 272, 1 July 2016, Pages 301-308
نویسندگان
Yung-Ching Wang, Janet G. Luhmann, Ali Rahmati, François Leblanc, Robert E. Johnson, Thomas E. Cravens, Wing-Huen Ip,