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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >A comparison of ground-based and spacecraft observations of coronal mass ejections from 1980-1989
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A comparison of ground-based and spacecraft observations of coronal mass ejections from 1980-1989

机译：1980年至1989年地面和航天器观测到的日冕物质抛射的比较

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摘要

We report here an analysis of observations of solar coronal mass ejection (CMEs) acquired in white light by the Mark II (MK3) K coronameter at Mauna Loa Solar Observatory between 1980 and 1989. Statistical properties of the locations, sizes, and speeds of these events are described. These properties are compared to those in the two other white light CME catalogs from the 1980s, the CMEs observed by the Solwind and SMM spaceborne coronagraphs, and relatively good statistical agreement is found between the three data sets taken over the entire period of observation. A detailed examination was performed for the 141 MK3 CMEs that were also observed by SMM. Virtually all (93%) of the CMEs detected low in the corona by the MK3 instrument were observed to travel out of the SMM field of view, into interplanetary space. The average width of CMEs in the MK3 field of view was 12 deg smaller than that measured in SMM, and we interpret this statistic as an indication of some increase in size as CMEs move outward through the corona. For a subset of 55 of those mass ejections we were able to combine detailed observations from both MK3 and SMM. Using the combined measurements, we were able to detect and to quantify the initial period of acceleration in a much larger fraction (61%) of the features than was possible from either MK3 alone (9%) or SMM alone (21%). The acceleration was positive for 87% of those features, with an average (median) value of + 0.264 km s~(-2) (+ 0.044 km s~(-2)). A distinction in terms of association with other forms of solar activity was also evident in this analysis: 55% of the CMEs associated with active regions moved with constant speed, but 82% of the features associated with the eruption of solitary prominences moved with constant acceleration. Also, the average speed for CMEs associated with active regions was significantly faster than those with prominence association (955 versus 411 km s~(-1)). The detection of positive acceleration demonstrates that the forces propelling the CME continue to dominate these events, at least through the altitudes covered by the MK3 and SMM fields of view.
机译：我们在此报告对1980年至1989年之间莫纳罗亚太阳天文台Mark II（MK3）K日冕仪在白光下获得的太阳日冕物质抛射（CME）观测结果的分析。这些物质的位置，大小和速度的统计特性描述了事件。将这些性质与1980年代其他两个白光CME目录中的那些性质（由Solwind和SMM星载日冕仪观察到的CME）进行了比较，并且在整个观察期间获得的三个数据集之间发现了相对较好的统计一致性。对SMM也观察到的141个MK3 CME进行了详细检查。观察到，几乎所有（93％）的CME被MK3仪器检测到的日冕电晕都从SMM视场移出，进入了行星际空间。在MK3视场中，CME的平均宽度比SMM中测量的平均宽度小12度，我们将此统计数据解释为随着CME穿过电晕向外移动时尺寸增加的迹象。对于这些大规模抛射中的55个子集，我们能够结合MK3和SMM的详细观测结果。与单独使用MK3（9％）或单独使用SMM（21％）相比，使用组合的测量结果，我们能够以更大的分数（61％）检测并量化加速的初始阶段。这些特征中有87％的加速度为正，平均（中位数）值为+ 0.264 km s〜（-2）（+ 0.044 km s〜（-2））。在该分析中，与其他形式的太阳活动之间的区别也很明显：与活动区域相关的CME中有55％以恒定速度运动，但与独立突出物喷发相关的82％特征以恒定加速度运动。而且，与活跃区域相关的CME的平均速度明显快于与突出区域相关的CME（955对411 km s〜（-1））。对正加速度的检测表明，至少在MK3和SMM视场所覆盖的高度上，推动CME的力继续主导这些事件。

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