کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8134157 1523483 2018 41 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Melting probes revisited - Ice penetration experiments under Mars surface pressure conditions
ترجمه فارسی عنوان
آزمایشگاه های ذوب مجدد - آزمایش های نفوذ یخ تحت شرایط فشار سطح مریخ
کلمات کلیدی
پروب های ذوب، مناطق قطبی مریخ، تست های آزمایشگاهی،
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علوم فضا و نجوم
چکیده انگلیسی
All surface pressure measurements that have been performed on Mars up to now indicate a surface pressure above the water triple point pressure (612  Pa). This means that water ice always transforms into the liquid phase when warmed up to 0°C, before it evaporates into the ambient atmosphere. The temporary existence of the liquid phase around the heated tip of the cryobot allows good thermal conductance between probe and surrounding ice, which is an important pre-requisite for efficient melt penetration. Our experiments indicate that under all possible Mars surface pressures the liquid phase is present when the probe is heated up. This finding confirms experimentally that a probe as it was proposed by Paige (1992) for in situ exploration of the Mars north polar layers would work in the expected way, although the penetration velocity must be expected be lower than under Earth pressure conditions. A test with the same probe, but under an almost two orders of magnitude lower gas pressure than on Mars, still indicates the temporary existence of the liquid phase in the contact region between the probe and the surrounding ice.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Icarus - Volume 308, 1 July 2018, Pages 117-127
نویسندگان
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