New method for estimating widths, velocities, and source location of halo coronal mass ejections

被引:117
作者
Michalek, G
Gopalswamy, N
Yashiro, S
机构
[1] Jagiellonian Univ, Astron Observ, PL-30244 Krakow, Poland
[2] Catholic Univ Amer, Ctr Solar Phys & Space Weather, Washington, DC 20064 USA
关键词
solar-terrestrial relations; Sun : corona; Sun : coronal mass ejections (CMEs);
D O I
10.1086/345526
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
It is well known that coronagraphic observations of halo coronal mass ejections (CMEs) are subject to projection effects. Viewing in the plane of the sky does not allow us to determine the crucial parameters that de ne the geoeffectiveness of CMEs, such as the space speed, width, or source location. Assuming that halo CMEs have constant velocities, are symmetric, and propagate with constant angular widths, at least in their early phase, we have developed a technique that allows us to obtain the required parameters. This technique requires measurements of sky-plane speeds and the moments of the first appearance of the halo CMEs above opposite limbs. We apply this technique to obtain the parameters of all the halo CMEs observed by the Solar and Heliospheric Observatory (SOHO) mission's Large Angle and Spectrometric Coronagraph experiment until the end of 2000. We also present a statistical summary of these derived parameters of the halo CMEs.
引用
收藏
页码:472 / 478
页数:7
相关论文
共 14 条
[11]   Large-scale structures and multiple neutral lines associated with coronal mass ejections [J].
Webb, DF ;
Kahler, SW ;
McIntosh, PS ;
Klimchuck, JA .
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 1997, 102 (A11) :24161-24174
[12]  
WEBB DF, 1999, BAAS, V31, P853
[13]  
YASHIRO S, 2002, BAAS, V34
[14]  
ZHAO XP, 2002, J GEOPHYS RES, V107