Physics
Scientific paper
Sep 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.535..441m&link_type=abstract
In: Solar variability as an input to the Earth's environment. International Solar Cycle Studies (ISCS) Symposium, 23 - 28 June 2
Physics
Sun: Coronal Mass Ejections, Mhd
Scientific paper
We analyze the initiation and development of coronal mass ejections (CMEs) launched on 2001 May 15 and 2001 May 25. Both CMEs show clearly recognizable three-part structure already at low heights during the initial gradual rise in the pre-eruptive phase. This provides measurements of relative kinematics of the three-part structure from the very beginning of the eruption up to the post-acceleration phase. In both CMEs the frontal rim starts accelerating some 10-20 min before the prominence. However, the acceleration maximum of the prominence and the frontal rim was synchronized. CMEs attained the maximum acceleration of ≍350 m s-2 and ≍250 m s-2, at the leading edge heliocentric distance R=2.4 and R=2.1 solar radii, respectively. In both cases the acceleration time profile of the frontal rim was broader than that of the prominence, although the peak values were similar. The CMEs attained velocities in excess of 1000 km s-1, showing a weak deceleration at large heights. The leading edge of CME starts decelerating before the prominence in both cases, indicating that the deceleration is caused by the aerodynamic drag force.
Hržina D.
Maricic Danijel
Rosa Daniel
Stanger Andrew L.
Vrsnak Bojan
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