THE POSTFLARE LOOPS AND THE NEARBY ACTIVE CHROMOSPHERE OF 1992-JUNE-26

The main objective of this paper is to present a quantitative study of the dynamics of the evolution of H alpha postflare loops developed af ter a large solar flare and the processed videos produced from the obs ervations. The high spatial resolution of the Swedish Vacuum Solar Tel escope (SVST) at La Palma has provided a unique set of data for such a n event. A Gaussian fitting method is proposed to derive intensities a nd Doppler shifts from observations taken at three wavelengths (H alph a center and H alpha +/- 0.07 nm). Moving condensations or ''blobs'' o f cold material provide transverse velocities, which, together with th e radial component, enable us to derive their velocity vector magnitud e. Plasma velocities are around free-fall velocities near the top of t he loops but are significantly smaller close to their footpoints, sugg esting a deceleration mechanism. The loops are anchored in the chromos phere, which shows tremendous activity in the active region and in the nearby ''quiet Sun.'' Spicules and ejection of plasmoids are also obs erved at the limb.