Relationship Between Coronal Mass Ejections and Flares

Details Relationship Between Coronal Mass Ejections and Flares Relationship Between Coronal Mass Ejections and Flares

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsh31c..05z&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SH31C-05

Astronomy and Astrophysics

Astrophysics

1

7500 Solar Physics, Astrophysics, And Astronomy, 7509 Corona, 7513 Coronal Mass Ejections, 7514 Energetic Particles (2114), 7519 Flares

Scientific paper

We present the results of our observational study about the relationship between CMEs (Coronal Mass Ejections) and flares. We make use of CME events well observed by the LASCO instrument (Large Angle and Spectrometric Coronagraph), which are suitable for studying their detailed kinematic evolution throughout the lower corona (1.1--3 Rsun, the LASCO C1 field of view) and the upper corona (2--30 Rsun, the LASCO C2/C3 field of view). We make height-time and velocity-time plots for these events, giving special attention to the height range of the lower corona where CME acceleration takes place. We find that the evolution of impulsive CMEs can be divided into three phases: initiation phase characterized by slow ascension (less than 80 km/s), impulsive acceleration phase, and subsequent propagation phase. The initiation phase starts earlier than the onset time of the associated flare. However, the onset time of the impulsive acceleration phase coincides with the onset time of the flare, and the acceleration period of the impulsive acceleration phase coincides with the rise phase of the flare. Gradual CMEs, which are not associated with flares, do not show an impulsive acceleration phase. On the other hand, there exists another class of CMEs, which we call explosive CMEs. Explosive CMEs are accelerated extremely fast to reach a great velocity; the acceleration takes place very low in the corona (less than 0.5 Rsun above the surface). They do not show an initiation phase and are associated with major flares. The Nov. 6, 1997 CME/flare event, which is a great particle event, is a typical explosive one and will be discussed in detail in the presentation

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