论文标题
太阳能循环23和24之间的CME膨胀速度的比较
A comparison of CME expansion speeds between solar cycles 23 and 24
论文作者
论文摘要
我们报告了太阳能循环23和24之间的肢体冠状质量弹出（CME）的膨胀速度的比较。我们选择了大量的肢体CME事件，与两个循环中的软X射线火炬尺寸大于或等于M1.0相关。我们使用了在线CME目录（https://cdaw.gsfc.nasa.gov）上可用的数据和测量工具，该工具由太阳能和地球观测值（SOHO）大角度和光谱仪（Lasco）（Lasco）所检测到的所有CME组成。我们发现24周期中的膨胀速度高于周期23中的膨胀速度。我们还发现，径向和膨胀速度之间的关系在周期23和24中具有不同的斜率。周期24斜率比周期23中的斜率高45％。给定径向速度的膨胀速度也高。差异随速度增加。对于2000 km/s的径向速度，周期24中的膨胀速度高约48％。这些结果为24-CME的异常扩张提供了其他证据，这是由于地球球中总压力降低所致。
We report on a comparison of the expansion speeds of limb coronal mass ejections (CMEs) between solar cycles 23 and 24. We selected a large number of limb CME events associated with soft X-ray flare size greater than or equal to M1.0 from both cycles. We used data and measurement tools available at the online CME catalog (https://cdaw.gsfc.nasa.gov) that consists of the properties of all CMEs detected by the Solar and Heliospheric Observatory's (SOHO) Large Angle and Spectrometric Coronagraph (LASCO). We found that the expansion speeds in cycle 24 are higher than those in cycle 23. We also found that the relation between radial and expansion speeds has different slopes in cycles 23 and 24. The cycle 24 slope is 45% higher than that in cycle 23. The expansion speed is also higher for a given radial speed. The difference increases with speed. For a 2000 km/s radial speed, the expansion speed in cycle 24 is ~48% higher. These results present additional evidence for the anomalous expansion of cycle 24-CMEs, which is due to the reduced total pressure in the heliosphere.
