Expansion Speed of Coronal Mass Ejections

Details Expansion Speed of Coronal Mass Ejections Expansion Speed of Coronal Mass Ejections

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009soph..260..401m&link_type=abstract

Solar Physics, Volume 260, Issue 2, pp.401-406

Physics

3

Sun: Solar Activity, Sun: Coronal Mass Ejections

Scientific paper

A large set of limb coronal mass ejections (CMEs) are used to determine the accurate relationship between radial ( V rad) and expansion ( V exp) speeds of CMEs. It is demonstrated that this relation is exceptionally well described by the function f( w)=1/2(1+cot w), representing a full cone model for the CME with a half-width, w. We also demonstrate that for extremely fast CMEs ( V exp>3000 km s-1), it is better to use the approximation V rad≈ V LE. This implies that such CMEs expand spherically above the solar surface.

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