论文标题
高纬度和近极冠状孔的旋转速率
Rotation rate of high latitude and near polar coronal holes
论文作者
论文摘要
在1997 - 2006年期间，使用SOHO/EIT 195 $Å$完整磁盘校准图像检测到的冠状孔用于计算高纬度和近极冠状孔的旋转速率，并研究了其纬度变化。我们发现，对于$ 80^{o} $ north和$ 75^{o} $ South的不同纬度区域，对于其所有区域，在太阳能磁盘上观察到的天数及其纬度，冠状孔会严格旋转。冠状孔的恒星旋转速率的估计幅度为：赤道的$ 13.051 \ pm 0.206 $ deg，$ 12.993 \ pm 0.064 $ 0.064 $ deg/day/天在较高的纬度地区，$ 12.999 \ pm 0.329 $ 0.329 \ pm 0.329 $ 0.329 $ 0.329。对于所有纬度和该区域，我们还研究了这些冠状孔的旋转速率的年变化。我们发现，多年来，冠状孔稳定旋转，其赤道，高纬度和极性区域旋转速率的大小与太阳能活动的幅度无关。
For the period of 1997-2006, coronal holes detected in the SOHO/EIT 195 $Å$ full disk calibrated images are used to compute the rotation rates of high latitude and near polar coronal holes and, their latitudinal variation is investigated. We find that, for different latitude zones between $80^{o}$ north and $75^{o}$ south, for all their area, the number of days observed on the solar disk, and their latitudes, coronal holes rotate rigidly. Estimated magnitudes of sidereal rotation rate of the coronal holes are: $13.051 \pm 0.206$ deg/day for the equator, $12.993 \pm 0.064$ deg/day in the region of higher latitudes and, $12.999 \pm 0.329$ deg/day near the polar regions. For all the latitudes and the area, we have also investigated the annual variation of rotation rates of these coronal holes. We find that, for all the years, coronal holes rotate rigidly and their magnitude of equatorial, high latitude and polar region rotation rates are independent of magnitude of solar activity.
