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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Properties of coronal mass ejections: SOHO LASCO observations from January 1996 to June 1998
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Properties of coronal mass ejections: SOHO LASCO observations from January 1996 to June 1998

机译：日冕物质抛射的性质：1996年1月至1998年6月SOHO LASCO观测

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We report the properties of all the 841 coronal mass ejections (CMEs) observed by the Solar and Heliospheric Observatory (SOHO) Large Angle Spectroscopic Coronagraph (LASCO) C2 and C3 white-light coronagraphs from January 1996 through June 1998, and we compare those properties to previous observations by other similar instruments. Both the CME rate and the distribution of apparent locations of CMEs varied during this period as expected based on previous solar cycles. The distribution of apparent speeds and the fraction of CMEs showing acceleration were also in agreement with earlier reports. The pointing stability provided by an L-l orbit and the use of CCD detectors have resulted in superior brightness sensitivity for LASCO over earlier coronagraphs; however, we have not detected a significant population of fainter (i.e., low mass) CMEs. The general shape of the distribution of apparent sizes for LASCO CMEs is similar to those of earlier reports, but the average (median) apparent size of 72 degrees (50 degrees) is significantly larger. The larger average apparent size is predominantly the result of the detection of a population of partial and complete halo CMEs at least some of which appear to be events with a significant longitudinal component directed along the Sun-Earth line, either toward or away from the Earth. Using full disk solar images obtained by the Extreme ultraviolet Imaging Telescope (EIT) on SOHO, we found that 40 out of 92 of these events might have been directed toward the Earth, and we compared the timing of those with the I(I) geomagnetic storm index in the days following the CME, Although the "false alarm" rate was high, we found that 15 out of 21 (71%) of the K-p greater than or equal to 6 storms could be accounted for as SOHO LASCO/EIT frontside halo CMEs. If we eliminate three Kp, storms that occurred following LASCO/EIT data gaps. then the possible association rate was 15 out of 18 (83%). [References: 73]
机译：我们报告了1996年1月至1998年6月太阳和日球天文台（SOHO）大角度光谱日冕仪（LASCO）C2和C3白光日冕仪观测到的所有841个日冕物质抛射（CME）的性质，并比较了这些性质其他类似工具先前的观察结果。根据先前的太阳周期，在此期间，CME速率和CME视在位置的分布均发生了变化。表观速度的分布和显示加速的CME的比例也与早期报告一致。 L-1轨道所提供的指向稳定性以及CCD检测器的使用使LASCO的亮度灵敏度优于早期的电晕仪。但是，我们尚未发现大量淡淡（即低质量）的CME。 LASCO CME的视在尺寸分布的一般形状与早期报道相似，但平均（中位）视在尺寸72度（50度）明显更大。较大的平均视在尺寸主要是检测到部分和完整的晕轮CME的结果，其中至少一些似乎是具有明显的纵向分量的事件，这些分量沿太阳-地球线指向或远离地球。使用SOHO上的极紫外成像望远镜（EIT）获得的全盘太阳图像，我们发现在这些事件中，有92个中有40个是直接指向地球的，我们将这些事件与I（I）地磁的时间进行了比较。 CME之后几天的风暴指数，尽管“误报”率很高，但我们发现，在21个Kp大于或等于6个风暴中，有15个（71％）可以解释为SOHO LASCO / EIT的前沿晕CME。如果我们消除三个Kp，则会在LASCO / EIT数据缺口之后发生风暴。那么可能的关联率为18中的15（83％）。 [参考：73]

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