Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsh22d..04z&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #SH22D-04
Astronomy and Astrophysics
Astrophysics
7500 Solar Physics, Astrophysics, And Astronomy, 7509 Corona, 7513 Coronal Mass Ejections, 7519 Flares, 7524 Magnetic Fields
Scientific paper
We know there are two dynamical types of coronal mass ejections (CMEs). CMEs originating from active regions and accompanied by flares tend to have speeds already above the CME median speed (400km/s) low in the corona. Other CMEs originating away from active regions and accompanied by prominences show gradual accelerations starting at or below the median speed low in the corona. In the talk, we will present a qualitative theory that relates these two dynamical types of CMEs to the two topologically different initial states, namely inverse or normal quiescent prominences. Our theory explains the observed dual character of CME speed-height profiles in terms of the interplays between flux rope expulsion and magnetic reconnection in topologically different magnetic environments. Our theory also relates CMEs to the new flux emergences and discusses their roles in the global coronal magnetic field reversal processes during the solar cycles. Observational implications supporting our theories will also be addressed.
Low B.
Zhang Minghui
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