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arXiv 0801.1977astro-ph
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Halo CME投影速度不对称性的空间天气应用

Space Weather Application Using Projected Velocity Asymmetry of Halo CMEs

G. Michalek, N. Gopalswamy, S. Yashiro

摘要:

来自太阳中心附近区域的晕日冕物质抛射(HCME)可能是造成严重磁暴的原因。重要的是,当它们仍然靠近太阳时,使用观测来预测HCME的地球有效性。遗憾的是,日冕观测由于投影效应而不能提供日冕物质抛射的真实速度。在本文中,我们提出了一种新的技术,允许估计空间速度和近似源位置使用投影速度在不同的位置角测量给定的HCME(速度不对称)。我们将这种技术应用于2001-2002年期间观测到的HCME,发现改进的速度更好地与HCME到地球的旅行时间和随之而来的磁暴的大小相关。

英文摘要:

Halo coronal mass ejections (HCMEs) originating from regions close to the center of the Sun are likely to be responsible for severe geomagnetic storms. It is important to predict geo-effectiveness of HCMEs using observations when they are still near the Sun. Unfortunately, coronagraphic observations do not provide true speeds of CMEs due to the projection effects. In the present paper, we present a new technique allowing estimate the space speed and approximate source location using projected speeds measured at different position angles for a given HCME (velocity asymmetry). We apply this technique to HCMEs observed during 2001-2002 and find that the improved speeds are better correlated with the travel times of HCMEs to Earth and with the magnitudes ensuing geomagnetic storms.

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。

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