Spatial variation of >106MeV proton fluxes observed during the Ulysses rapid latitude scan: Ulysses COSPIN/KET results
Spatial variation of >106MeV proton fluxes observed during the Ulysses rapid latitude scan: Ulysses COSPIN/KET results
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DOI：
10.1029/96gl01042
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发表时间：
1996-06-01
影响因子：
5.2
通讯作者：
Paizis, C
中科院分区：
文献类型：
--
作者：
Heber, B;Droge, W;Paizis, C
导致日光层中宇宙射线长期调制的基本物理过程多年来一直为人所知。然而，我们对各种进程的相对重要性的认识仍然不完全。在高纬度观测宇宙射线可用于提高我们对调制过程的理解。在本文中，我们提出的测量银河质子通量与能量超过106兆电子伏的基尔电子望远镜上的宇宙飞船在快速扫描期间，从1994年9月的南极通道到1995年8月的北极，在太阳极小的条件下。在高纬度和黄道上的质子通量的比较表明，在极地地区的通量高出20%。通量的增加是不对称的相对于日面赤道，而是相对于一个表面移动了7度南。在这样的坐标系中，两个半球的纬度梯度值为（0.33 +/- 0.02）%/deg。
The basic physical processes that lead to the longterm modulation of cosmic rays in the heliosphere have been known for many years. However, our knowledge of the relative importance of the various processes is still incomplete. Observations of cosmic rays at high latitudes can be used to improve our understanding of modulation processes. In this paper we present measurements of galactic proton fluxes with energies above 106 MeV made by the Kiel Electron Telescope on board the Ulysses spacecraft during the fast scan from the South polar passage in September 1994 to the North pole in August 1995, under solar minimum conditions. Comparison of proton fluxes at high latitudes and in the ecliptic shows a 20% higher flux in polar regions. The flux increase is not symmetric with respect to the heliographic equator but rather with respect to a surface shifted by 7 degrees South. In such a coordinate system the latitudinal gradient in both hemispheres has a value of (0.33 +/- 0.02)%/deg.