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Flux and Isotopic Composition of Helium in the Ancient Solar Wind

机译：古代太阳风中氦气的通量和同位素组成

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The isotopic composition and concentrations of helium are investigated in 9 samples taken from different depths of a soil column delivered by the Luna-24 mission. It is demonstrated that, with allowance made for random errors, the isotopic composition of helium remains invariable. The concentrations of helium are subject to considerable variations, the increases and decreases relative to the average value reaching a factor of 1.5-2. Assuming that the full length of the soil column was formed due to long-term accumulation of lunar clastic rocks (regolith), based on measurements of cosmogenic isotopes, a method of determining the rate of regolith accumulation has been developed, as well as a method of determining the age of the column soil samples. It is found that the rate of regolith accumulation is variable, and it changes over the column length within the limits (0.2-0.8 cm)/10~6 years. The range of the time forformation of the investigated part of the column is 100-600 million years. The observed decreases of concentration (at 250 and 600 million years) can be associated with both solar and lunar processes. In particular, a possibility of diffusion losses of helium due to the mechanism of jump-like diffusion is discussed, and diffusion parameters are found. A comparison of time periods of the observed variations in the solar wind with paleontological epochs and periods is made.
机译：对Luna-24任务从土壤柱的不同深度采集的9个样品中的氦同位素组成和浓度进行了研究。结果表明，在允许随机误差的情况下，氦的同位素组成保持不变。氦气浓度变化很大，相对于平均值的增加和减少达到1.5-2的倍数。假设土壤柱的全长是由于长期碎屑岩（长石）的堆积而形成的，基于宇宙成因同位素的测量，开发了一种确定长石堆积速率的方法以及一种方法。确定柱状土壤样品的年龄。结果表明，硬石膏的堆积速率是可变的，并且在柱长范围（0.2-0.8 cm）/ 10〜6年内变化。该塔的研究部分形成时间的范围是100-600百万年。观测到的浓度下降（在250和6亿年）可能与太阳过程和月球过程有关。特别地，讨论了由于跳跃状扩散的机理而导致的氦扩散损失的可能性，并找到了扩散参数。将太阳风中观测到的变化的时间周期与古生物学时代和周期进行了比较。

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    《Cosmic research》 |2010年第1期|p.101-107|共7页
  • 作者

    G. S. Anufriev;

  • 作者单位

    Ioffe Physical Technical Institute, Russian Academy of Sciences, Politekhnicheskaya ul. 26, St. Petersburg, 194021 Russia;

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