Observations of Preflare Conditions

Haimin Wang

In this talk, I will review the observations of preflare conditions. The following topics will be discussed: (1) Magnetic topology before flares, such as magnetic gradient, magnetic shear, current structure, helicity injection and new flux emergence. (2) Flow fields before flares, such as shear flows, converging flows and apparent active region rotation. (3) upper atmospheric signature such as filament activation, sigmoid structure and pre-cursor heating of flares. In addition, I will discuss the evolution of these magnetic structures leading to and following the flares.

Correspondence

Haimin Wang

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