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Directionality of the Martian Surface Radiation and Derivation of the Upward Albedo Radiation
Geophysical Research Letters ( IF 5.2 ) Pub Date : 2021-07-16 , DOI: 10.1029/2021gl093912
Jingnan Guo 1, 2, 3 , Salman Khaksarighiri 3 , Robert F. Wimmer‐Schweingruber 3 , Donald M. Hassler 4 , Bent Ehresmann 4 , Cary Zeitlin 5 , Sven Löffler 3 , Daniel Matthiä 6 , Thomas Berger 6 , Günther Reitz 6 , Fred Calef 7
Affiliation  

Since 2012 August, the Radiation Assessment Detector (RAD) on the Curiosity rover has been characterizing the Martian surface radiation field which is essential in preparation for future crewed Mars missions. RAD observed radiation dose is influenced by variable topographical features as the rover traverses through the terrain. In particular, while Curiosity was parked near a butte in the Murray Buttes area, we find a decrease of the dose rate by (5 urn:x-wiley:00948276:media:grl62734:grl62734-math-0001 1)% as 19% of the sky was obstructed, versus 10% in an average reference period. Combining a zenith-angle-dependent radiation model and the rover panoramic visibility map leads to a predicted reduction of the downward dose by urn:x-wiley:00948276:media:grl62734:grl62734-math-000212% due to the obstruction, larger than the observed decrease. With the hypothesis that this difference is attributable to albedo radiation coming from the butte, we estimate the (flat-terrain) albedo radiation to be about 19% of the total surface dose.

中文翻译:

火星表面辐射的方向性和向上反照率辐射的推导

自 2012 年 8 月以来,好奇号火星车上的辐射评估探测器 (RAD) 一直在表征火星表面辐射场,这对于为未来载人火星任务做准备至关重要。当漫游车穿越地形时,RAD 观测到的辐射剂量受可变地形特征的影响。特别是,当好奇号停在 Murray Buttes 地区的一个小山丘附近时,我们发现剂量率降低了 (5 骨灰盒:x-wiley:00948276:媒体:grl62734:grl62734-math-00011)%,因为 19% 的天空被遮挡,而在平均参考期内为 10%。结合天顶角依赖辐射模型和漫游车全景能见度图导致向下剂量的预测减少骨灰盒:x-wiley:00948276:媒体:grl62734:grl62734-math-000212% 由于阻塞,大于观察到的减少。假设这种差异归因于来自小山的反照率辐射,我们估计(平坦地形)反照率辐射约为总表面剂量的 19%。
更新日期:2021-08-01
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