期刊
ASTROPHYSICAL JOURNAL
卷 884, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.3847/1538-4357/ab412a
关键词
planets and satellites: magnetic fields; Sun: activity; Sun: magnetic fields; solar wind
资金
- Science and Technology Development Fund, Macao SAR [008/2016/A1]
- National Natural Science Foundation of China (NSFC) [41564007, 41731067]
By assuming that the solar wind flow is spherically symmetric and that the flow speed becomes constant beyond some critical distance r = R-0 (neglecting solar gravitation and acceleration by high coronal temperature), the largescale solar wind magnetic field lines are distorted into a Parker spiral configuration, which is usually simplified to an Archimedes spiral. Using magnetic field observations near Mercury, Venus, and Earth during solar maximum of Solar Cycle 24, we statistically surveyed the Parker spiral angles and obtained the empirical equations of the Archimedes and Parker spirals by fitting the multiple-point results. We found that the solar wind magnetic field configurations are slightly different during different years. Archimedes and Parker spiral configurations are quite different from each other within 1 au. Our results provide empirical Archimedes and Parker spiral equations that depend on the solar wind velocity and the critical distance (R-0). It is inferred that R-0 is much larger than that previously assumed. In the near future, the statistical survey of the near-Sun solar wind velocity by Parker Solar Probe can help verify this result.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据