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
presentation
invited