Cme Propagation And Expansion In 3-d Space In The Heliosphere Based On Stereo/secchi Observations.

Details Cme Propagation And Expansion In 3-d Space In The Heliosphere Based On Stereo/secchi Observations. Cme Propagation And Expansion In 3-d Space In The Heliosphere Based On Stereo/secchi Observations.

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spd....40.2106p&link_type=abstract

American Astronomical Society, SPD meeting #40, #21.06; Bulletin of the American Astronomical Society, Vol. 41, p.855

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We report a study of kinematics and morphological evolution of CMEs by using STEREO/SECCHI observation to track in 3-D space a set of well observed events from the sun to a large distance in the heliosphere. The CME tracking is based on the Raytrace model (Thernisien et al 2006), which is able to represent a CME as a 3-D flux rope in the upper portion and two straight legs in the lower portion. The true 3-D location can be obtained. We are able to further calculate 3D velocity and 3D acceleration of CMEs free of project effect. In particular, the true cross-section of CMEs, and thus the expansion speed can be found. For the 5 events studied, we find that their bulk velocities eventually converge into a narrow range of 450 km/s - 650 km/s, while their initial velocities range from about 200 km/s to 1300 km/s. Their expansion velocities also converge into a narrow range between 140 km/s and 300 km/s. We find that the deceleration for fast events mainly occur within 40 solar radii. We also explore theoretical models to explain the CME bulk motion and expansion, in particular, the solar wind dragging force effect on CME kinematic evolutions.

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