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arXiv 1507.03473astro-ph.EPastro-ph.SRhep-exphysics.space-ph
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在第一个MSL火星年:2012-2014年期间由RAD测量的剂量率变化建模

Modeling the variations of Dose Rate measured by RAD during the first MSL Martian year: 2012-2014

Jingnan Guo, Cary Zeitlin, Robert F. Wimmer-Schweingruber, Scot Rafkin, Donald M. Hassler, Arik Posner, Bernd Heber, Jan Koehler, Bent Ehresmann, Jan K. Appel, … 展开作者

Jingnan Guo, Cary Zeitlin, Robert F. Wimmer-Schweingruber, Scot Rafkin, Donald M. Hassler, Arik Posner, Bernd Heber, Jan Koehler, Bent Ehresmann, Jan K. Appel, Eckart Boehm, Stephan Boettcher, Soenke Burmeister, David E. Brinza, Henning Lohf, Cesar Martin, H. Kahanpaeae, Guenther Reitz

摘要:

火星科学实验室(MSL)的火星车Currency上的辐射评估探测器(RAD)测量火星表面高能带电和中性粒子的{能谱}以及辐射剂量率。通过对火星表面的这些首次测量,RAD观察到同时影响银河宇宙射线(GCR)引起的表面辐射剂量的几种效应:[a]由每日热潮汐引起的火星大气压力的短期日变化,[b]火星大气中的长期季节性压力变化,以及[c]日光层磁场对主要GCR通量的调制,这与长期的太阳活动和太阳的旋转有关。RAD表面剂量测量,以及表面压力数据和太阳调制因子,进行了分析和拟合的经验模型,定量地证明了长期影响([b]和[c])是如何与测量的剂量率。相应地,我们可以估计不同太阳调制和不同大气条件下的剂量率和剂量当量,从而可以对火星表面辐射环境进行经验预测。

英文摘要:

The Radiation Assessment Detector (RAD), on board Mars Science Laboratory's (MSL) rover Curiosity, measures the {energy spectra} of both energetic charged and neutral particles along with the radiation dose rate at the surface of Mars. With these first-ever measurements on the Martian surface, RAD observed several effects influencing the galactic cosmic ray (GCR) induced surface radiation dose concurrently: [a] short-term diurnal variations of the Martian atmospheric pressure caused by daily thermal tides, [b] long-term seasonal pressure changes in the Martian atmosphere, and [c] the modulation of the primary GCR flux by the heliospheric magnetic field, which correlates with long-term solar activity and the rotation of the Sun. The RAD surface dose measurements, along with the surface pressure data and the solar modulation factor, are analysed and fitted to empirical models which quantitatively demonstrate} how the long-term influences ([b] and [c]) are related to the measured dose rates. {Correspondingly we can estimate dose rate and dose equivalents under different solar modulations and different atmospheric conditions, thus allowing empirical predictions of the Martian surface radiation environment.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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