Coronal Holes in Solar Cycles 21 to 23
Coronal Holes in Solar Cycles 21 to 23
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太阳活动周期 21 至 23 中的冕洞
DOI：
10.1007/s11207-013-0387-4
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发表时间：
2014
期刊：
影响因子：
2.8
通讯作者：
V. Vasil’eva
中科院分区：
文献类型：
--
作者：
A. Tlatov;K. Tavastsherna;V. Vasil’eva
我们介绍了基特峰天文台在He I 10 830线(1975年至2003年)和与SOHO/EIT合作的EUV195波长(1996年至2012年)观测到的日冕洞(CHS)的识别。为了确定某一特征是否为CH，我们开发了半自动技术，用于在天气图上描绘CH边界，并随后在磁场图表上绘制这些边界。使用这些技术，我们在1975年至2012年的时间间隔内将CH边界叠加在磁场图表上。高纬CHS对总面积的贡献最大，但在第23太阳周期的衰退期，低纬CHS的贡献显著增加。银河系宇宙射线通量和日球层电流片倾角的变化遵循CH区的周期变化。高纬度CHS影响黄道面太阳风的性质。
We present identifications of coronal holes (CHs) from observations in the He i 10 830 Å line made at Kitt Peak Observatory (from 1975 to 2003) and in the EUV 195 Å wavelength with SOHO/EIT (from 1996 to 2012). To determine whether a feature is a CH we have developed semi-automatic techniques for delineating CH borders on synoptic charts and for subsequent mapping of these borders on magnetic-field charts. Using these techniques, we superimposed CH borders on magnetic-field charts over the time interval from 1975 to 2012. A major contribution to the total area was made by high-latitude CHs, but in the declining phase of solar cycle 23, the contribution from low-latitude CHs increased substantially. Variations in the flux of Galactic cosmic rays and those in the inclination angle of the heliospheric current sheet followed the cyclic variations of CH areas. High-latitude CHs affect the properties of the solar wind in the ecliptic plane.
影响因子：
2.8
作者：
Abramenko, Valentyna;Yurchyshyn, Vasyl;Watanabe, Hiroko
通讯作者：
Watanabe, Hiroko