...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Space Science Reviews >Time-Variability in the Interstellar Boundary Conditions of the Heliosphere: Effect of the Solar Journey on the Galactic Cosmic Ray Flux at Earth
【24h】

Time-Variability in the Interstellar Boundary Conditions of the Heliosphere: Effect of the Solar Journey on the Galactic Cosmic Ray Flux at Earth

机译：太阳圈星际边界条件下的时间变化：太阳历程对地球银河宇宙射线通量的影响

获取原文
获取原文并翻译 | 示例
   

获取外文期刊封面封底 >>

       
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

During the solar journey through galactic space, variations in the physical properties of the surrounding interstellar medium (ISM) modify the heliosphere and modulate the flux of galactic cosmic rays (GCR) at the surface of the Earth, with consequences for the terrestrial record of cosmogenic radionuclides. One phenomenon that needs studying is the effect on cosmogenic isotope production of changing anomalous cosmic ray fluxes at Earth due to variable interstellar ionizations. The possible range of interstellar ram pressures and ionization levels in the low density solar environment generate dramatically different possible heliosphere configurations, with a wide range of particle fluxes of interstellar neutrals, their secondary products, and GCRs arriving at Earth. Simple models of the distribution and densities of ISM in the downwind direction give cloud transition timescales that can be directly compared with cosmogenic radionuclide geologic records. Both the interstellar data and cosmogenic radionuclide data are consistent with two cloud transitions, within the past 10,000 years and a second one 20,000–30,000 years ago, with large and assumption-dependent uncertainties. The geomagnetic timeline derived from cosmic ray fluxes at Earth may require adjustment to account for the disappearance of anomalous cosmic rays when the Sun is immersed in ionized gas.
机译：在穿过银河空间的太阳旅行期间，周围星际介质（ISM）物理特性的变化会改变太阳系层并调节地球表面的银河系宇宙射线（GCR）的通量，从而对地球上的宇宙成因记录产生影响放射性核素。需要研究的一种现象是由于星际电离变而改变地球上异常宇宙射线通量对宇宙成因同位素产生的影响。在低密度太阳环境中，星际撞击压力和电离水平的可能范围会产生截然不同的太阳圈结构，其中星际中性粒子，其次级产物和GCR的各种粒子通量到达地球。顺风向的ISM分布和密度的简单模型给出了云跃迁的时标，可以直接与宇宙成因放射性核素地质记录进行比较。星际数据和宇宙成因放射性核素数据都与过去10,000年和两次20,000-30,000年之间的两次云过渡一致，且存在很大的假设不确定性。从地球上的宇宙射线通量得出的地磁时间线可能需要进行调整，以解决太阳浸入电离气体中时宇宙射线异常消失的问题。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号