对T。A. Howard和G. M.西姆内特
Comment on "Interplanetary coronal mass ejections that are undetected by solar coronagraphs" by T. A. Howard and G. M. Simnett
摘要：
Howard和Simnett（HS）采用了一种新的技术，将LASCO CME与SMEI ICME联系起来。为了将SMEI数据外推回LASCO视场，他们使用了依赖于速度和方向的非线性轨迹，这比只有一个参数（速度）的线性外推更现实。但是，他们的方法有两个错误和一个错误：（1）HS使用了两个自由的方向参数，而只有一个可以自由选择，因为第二个是由SMEI数据提供的。因此，HS确定的方向是不正确的。(2)HS忽略了，由于轨迹取决于一个以上的参数，因此有一组广泛的轨迹，用于各种速度和方向，匹配事件，因此有广泛的开始时间。HS仅为每个SMEI事件选择一个轨迹。因此，他们所做的联想是不完整的，他们应该重新审查。只要还没有完成，任何关于日冕物质抛射未被太阳日冕仪探测到的结论都是不成熟的。(3)HS在确定SMEI速度时犯了一些错误。表1中给出的速度大约是获得表中给出的起始时间所需速度的两倍。它解释了为什么SMEI速度分布过度向高速移动;因此，没有理由寻找物理解释。
英文摘要：
Howard and Simnett (HS) employed a new technique for associating LASCO CMEs to SMEI ICMEs. In order to extrapolate the SMEI data back to the LASCO field of view they used nonlinear trajectories, dependent on a speed and direction, what is more realistic than the linear extrapolation with only one parameter (a speed). However, there are two errors and one mistake in their procedure: (1) HS used two free parameters of the direction, whereas only one can be freely selected, because the second is provided by SMEI data. As a result, the directions determined by HS are incorrect. (2) HS overlooked that, since the trajectory depends on more than one parameter, there is a broad set of trajectories, for various speeds and directions, matching the event, and thus a broad range of the onset times. HS select only one trajectory for each SMEI event. Therefore the associations made by them are incomplete, and they should be reexamined. As long as it is not done any conclusion about CMEs undetected by solar coronagraphs are premature. (3) HS made some mistake in determination of the SMEI speeds. The speeds given in their Table 1 are about twice as high as those demanded to obtain the onset times given in the table. It explains why the SMEI speed distribution is excessively shifted toward high speeds ; hence, there is no reason to search for a physical explanation.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
