Dynamics of coronal mass ejections in the near-Sun interplanetary space

Details Dynamics of coronal mass ejections in the near-Sun interplanetary space Dynamics of coronal mass ejections in the near-Sun interplanetary space

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.535..517v&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

1

Sun: Cmes, Corona, Interplanetary Medium, Mhd

Scientific paper

Kinematics of more than 5000 coronal mass ejections (CMEs) measured between 2 and 30 solar radii is investigated. A distinct relationship between the late-phase acceleration of CMEs and their velocities is found. It can be represented in the form a[m s-2] = -0.02(v-400)[km s-1]. The relationship is interpreted in terms of coupling of the CME motion and the solar wind, i.e., by the action of the aerodynamic drag. The results indicate that in the considered radial distance range the Lorentz force acceleration becomes weak, in the majority of the events spanning between 0 and 10 m s-2. Implications for the interplanetary motion of CMEs are discussed, emphasising the prediction of the 1 a.u. arrival time.

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