We have studied Mees Solar Observatory Hα spectroheliogram and
Doppler velocity movies of surges in 11 active regions.
We used these movies to observe the surges' rotating motion, direction of
propagation, and implied handedness of that motion.
We were able to co-register
movies containing 47 surges with Haleakala Stokes Polarimeter vector
magnetograms. We could hence determine the direction of twist stored
in the magnetic field at the point of origin of each surge. We found
(with a 99% confidence) that the direction of observed spin of
these surges is consistent with the relaxation of the stored twist in
the magnetic field. Magnetic reconnection of twisted flux tubes with
their less-twisted surroundings can account for the production and
rotating motion of these surges.
Authors: Jibben, P. & Canfield R. C.
Publication Status: ApJ (in press)
Last Modified: 2004-04-07 10:26