太阳风中宇宙线重离子的调制研究

Galactic cosmic rays which are originated outside the heliosphere include hydrogen to the actinides, and are very few of the measurable sample of matter from outside the solar system. Galactic cosmic rays are modulated by the solar activity when transported in the heliosphere. The intensity of galactic cosmic rays are varied showing a cycle with the solar activity. In addition, the variation of galactic cosmic rays influence the space weather significantly. Galactic cosmic ray heavy ions are only composed about one percent of heavy ions, previously the research of galactic cosmic ray are only concentrated on light ions (hydrogen and helium), but since galactic cosmic ray heavy ions have higher charge and mass, their contribution to radiation dose is relative important. The research of modulation of galactic cosmic rays heavy ions in the solar wind can help us to understand all kinds of transport and acceleration mechanisms of energetic particles in space, so it is important in space physics theoretically. In addition, to study the component of galactic cosmic rays and the variation of the spectra in space and time can help us better access the radiation risk of galactic cosmic rays in the near Earth environment, so it is important practically in space weather.

产生于太阳系外的银河宇宙线包括从氢到锕系的各种元素，它们是少有的太阳系外来的可直接在地球空间测量的物质。银河宇宙线在日球层中传播过程中受到太阳活动的调制,其通量随着太阳活动发生周期性变化,并强烈地影响着空间天气。宇宙线重离子成分只占银河宇宙线成分的百分之一左右，先前人们的研究主要集中在占比更大的宇宙线较轻离子上（质子和氦）。但是由于银河宇宙线重离子有更大的电荷数和质量数，它们对辐射剂量的贡献也比较重要。银河宇宙线重离子在太阳风中的调制机制研究，可以帮助我们更好地理解空间高能粒子的各种传播、加速机制，因此具有重要的空间物理学理论意义。另外，深入了解了银河宇宙线的成分组成及其能谱的时间空间变化，可以更好地帮助我们认识近地环境银河宇宙线的辐射风险，所以具有重要的空间天气学的实践意义。

产生于太阳系外的银河宇宙线包括从氢到锕系的各种元素，它们是少有的太阳系外来的可直接在地球空间测量的物质。银河宇宙线在日球层中传播过程中受到太阳活动的调制,其通量随着太阳活动发生周期性变化,并强烈地影响着空间天气。宇宙线重离子成分只占银河宇宙线成分的百分之一左右，先前人们的研究主要集中在占比更大的宇宙线较轻离子上（质子和氦）。但是由于银河宇宙线重离子有更大的电荷数和质量数，它们对辐射剂量的贡献也比较重要。银河宇宙线重离子在太阳风中的调制机制研究，可以帮助我们更好地理解空间高能粒子的各种传播、加速机制，因此具有重要的空间物理学理论意义。另外，深入了解了银河宇宙线的成分组成及其能谱的时间空间变化，可以更好地帮助我们认识近地环境银河宇宙线的辐射风险，所以具有重要的空间天气学的实践意义。