Space Weather: A Geometric Model Applied to Earth-directed LASCO Halo Coronal Mass Ejections (CMEs)

一个创新但相对简单的模型将被应用于用SOHO航天器上的LASCO仪器进行的太阳日冕物质抛射(CME)观测。从1996年获得的数据开始，将使用最初由赵、Plunkett和Liu开发的圆锥形模型来分析约150个与地球有关的日冕物质抛射或所谓的“晕”。从这个模型中，原则上可以推断出地球效应日冕物质抛射的大小和过境时间。这些信息将对空间天气预报员非常有用。如果该方法被证明是有效的，这项工作的第二个组成部分将涉及与美国国家海洋和大气局空间环境中心的空间天气预报员合作，开发有效的操作技术，根据LASCO图像序列估计CME旅行时间。

An innovative, but relatively simple, model will be applied to solar Coronal Mass Ejection (CME) observations made with the LASCO instrument on board the SOHO spacecraft. Starting with data obtained in 1996, some 150 Earth-directed, or so-called "halo", CMEs will be analyzed using a conical model originally developed by Zhao, Plunkett and Liu. From this model one may, in principal, be able to deduce sizes and transit times of geoeffective CMEs. This information would be extremely useful to Space Weather Forecasters. If the method proves to be effective, a second component of this effort would involve working with Space Weather Forecasters at NOAA's Space Environment Center to develop efficient operational techniques to estimate CME travel times based on sequences of LASCO images.