Triggering and Evolution of Solar Eruptions
Flux Rope Formation Prior to CME Onset
Evolution of the sigmoid of this active region provides clear evidence that a flux rope formed before the CME occurred and not at its onset. Green & Kliem, Astrophys. J. Letters, 700, L83, 2009.. View full-size photo here.
Forming a Flux Rope from a Magnetic Arcade
Fieldline reconnection between the legs of magnetic arcades generates or augment flux ropes, highlighted by changes in sigmoid tomography. Tripathi et al., Astrophys. J. Letters, 698, L27-L32, 2009.. View full-size photo here.
Rotating Erupting Filaments
Twist stored in the form of helicity in filaments can be converted into writhe as these large structures erupt, resulting in their rotation. Green et al., Solar Physics, 246, 365-391, 2007.. View full-size photo here.
Explaining fast and slow CMEs
Simulations reveal that the acceleration of a CME will be determined by the fall in strength with height of any overlying magnetic field. Torok & Kliem, Astron. Nachr., 328, 743-746, 2007.. View full-size photo here.
Coronal "Waves" are Footprints of CMEs
Rotational direction of waves are consistent with helicity-sense of source active regions, implying magnetic link between wave and CME. Attrill et al., Astrophys. J. Letters, 656, L101-L104, 2007.. View full-size photo here.
CMEs: Local Initiation but Far-Reaching Effects
Lateral expansion of CMEs generates successive reconnections with the environment so increasing the impact zone of the CME. van Driel-Gesztelyi et al., Ann. Geophys., 26, 3077-3088, 2008.. View full-size photo here.
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