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Properties of narrow coronal massejections observed with LASCO |
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| Authors: | S Yashiro N Gopalswamy G Michalek RA Howard |
| Institution: | 1The Catholic University of America, Washington, DC 20064, USA 2NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA 3Astronomical Observatory of Jagiellonian University, Cracow, Poland 4Naval Research Laboratory, Washington DC 20375, USA |
| Abstract: | We report the statistical properties of narrow coronal mass ejections (CMEs, angular width < 20°) withparticular emphasis on comparison with normal CMEs. We investigated 806 narrow CMEs from an online LASCO/CME catalog and found that (1) the fraction of narrow CMEs increases from 12% to 22% towards solar maximum, (2) during the solar maximum, the narrow CMEs are generally faster than normal ones, (3) the maximum speed of narrow CMEs (1141 km s−1) is much smaller than that of the normal CMEs (2604 km s−1). These results imply that narrow CMEs do not form a subset of normal CMEs and have a different acceleration mechanism from normal CMEs. |
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