Large Scale Coronal Magnetic Field and Coronal Holes in the Declining Phase of Solar Cycles
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摘要: 本文应用十八、十九周下降期的地磁观测资料导出了对应时期太阳风速度的卡林顿经度变化,并结合由极盖区地磁观测导出的行星际磁扇形结构确定十八、十九周下降期太阳南北磁极极性、类偶极点的太阳余纬和卡林顿经度,从而确定了该时期的冕洞分布,并与二十周冕洞分布进行比较.Abstract: The variation of the solar wind speed with the Carrington longitude in the declining phase of solar cycles 18 and 19 are deduced by using geomagnetic data. Referring to the sector structure of the IPM inferred from the geomagnetic observations in the polar cap, the polarity of the coronal magnetic field and the heliospheric colatitude and the Carrington longitude of the dipole-like poles are inferred in the same periods. The average results are compared with that of the solar cycle 20.
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