AbstractKinematics of CMEs is analyzed to get an insight into the properties of forces partaking in the eruption. It is demonstrated that the Lorentz force plays a dominant role within a distance of a few solar radii. In the distance range 1–30 solar radii, the inferred values of the Lorentz-force acceleration aL on average decrease with the heliocentric distance roughly as aL∝R−2. Generally, the values are found to be in the range g≲aL<30g, where g(R) is the acceleration of gravity. In fast events, the aerodynamic drag is comparable to the Lorentz force, and on average also decreases with the distance. However, the decrease is more gradual, so the drag becomes essential in the upper corona and interplanetary space.Inspecting the CME–flare relationship it is demonstrated that the reconnection beneath the CME plays an active role in the CME acceleration. Statistically, the CME speeds are correlated with the importance of the associated flare. The distribution of non-flare CME speeds is very similar to that of CMEs associated with flares of the soft X-ray importance C, and includes a considerable fraction of fast events. This implies that the concept of two distinct classes of CMEs (flare and non-flare) should be reformulated.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Forces governing coronal mass ejections


    Contributors:
    Vršnak, B. (author)

    Published in:

    Advances in Space Research ; 38 , 3 ; 431-440


    Publication date :

    2005-03-21


    Size :

    10 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English


    Keywords :


    Forces governing coronal mass ejections

    Vršnak, B. / COSPAR | British Library Conference Proceedings | 2006


    Forces governing coronal mass ejections

    Vršnak, B. | Online Contents | 2006


    Coronal mass ejections acceleration problem

    Wen, Yayuan | Online Contents | 2008


    Modeling interplanetary coronal mass ejections

    Riley, P. / Linker, J. A. / Mikic, Z. et al. | British Library Conference Proceedings | 2006


    Coronal mass ejections acceleration problem

    Wen, Y. / Wang, J. / Zhao, H. et al. | British Library Conference Proceedings | 2008