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The Speed Distributions of CMEs after the Projection Correction
Li, K. J.; Gao, P. X.
Observations of coronal mass ejections (CMEs) with coronagraphs are subject to the projection effect, which results in statistical errors in many properties of CMEs, such as the speed. In this paper, using the method based on the cone model to correct the speeds of CMEs due to the projection effect, we study the speed distribution of CMEs before a…
A Kinematical Study for the Galaxy Based on the Revised Hipparcos Astrometric Data
Zhang, H.; Shen, M.
On the basis of the revised Hipparcos data recently released, the zero-point of the PL relation for classical cepheids was reexamined. Fitting proper motion and radial velocity data via an axis symmetric model, Oort constants and circular rotation velocity of the LSR were calculated to obtain Galactocentric distance of the sun, R0 = 8.0±0.8 kpc. F…