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Study of Kinematic and Morphological Properties of CMEs
We present observations of several coronal mass ejections (CMEs) observed
by the LASCO and EIT instruments onboard the Solar and Heliospheric Observatory.
These include CMEs having bright circular rims which can be interpreted
as marking the apexes of expanding magnetic flux ropes. We have used image
processing techniques to enhance features in these CMEs which can be tracked
from their origins near the surface of the Sun out to great distances.
One particularly interesting feature is the existence of sinuous lines
below the circular rim, which in three dimensions may be helical in nature
based on their appearance. We compared the kinematic and morphological
properties of these CMEs with an MHD model of an erupting flux rope, and
found they can be successfully modeled in this manner. Our results show
that the acceleration of these CMEs takes place below heights of few solar
radii and the velocity has leveled off as the CME reaches the LASCO/C3
field of view. We discuss the evidence that depending of there speed, the
CMEs appear to be either gradually slowing down (fast CMEs), or gradually
accelerating (slow CMEs), as they continue to propagate plowing through
the solar wind.
Authors: M. Karovska (CfA), B.
E. Wood (JILA), J. Chen, J. W. Cook, R. A. Howard (NRL)
Harvard-Smithsonian Center for Astrophysics
Telephone: 617 495 7347
Fax: 617 495 7356
Address: 60 Garden Street
Cambridge, MA 02138
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