Interplanetary Acceleration of Coronal Mass Ejections: Comparison between numerical simulations and observations

Physics

Scientific paper

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2111 Ejecta, Driver Gases, And Magnetic Clouds, 7509 Corona, 7513 Coronal Mass Ejections

Scientific paper

For a set of 50 Coronal Mass Ejections (CMEs) observed with the Large Angle and Spectrometric COrongraph (LASCO) on board of the SOlar and Heliospheric Observatory (SOHO) mission, we estimate the density and measure the sky-plane speed at 18 solar radii (Rsun). We feed these parameters to a one dimensional, single fluid, hydrodynamic model to simulate the CME propagation from 18 Rsun to one AU, and iteratively adjust the initial temperature and ambient solar wind speed using in situ measurements by the Wind mission prior to and during the ICMEs that pair with the white-light CMEs. Following the evolution of the nose of the ejecta we are able to construct an acceleration model for the simulated ICMEs. We compare and discuss the simulated acceleration profile with the observed mean acceleration in order to obtain a general ICME acceleration model.

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