Twist Propagation in Hα Surges

Details Twist Propagation in Hα Surges Twist Propagation in Hα Surges

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004apj...610.1129j&link_type=abstract

The Astrophysical Journal, Volume 610, Issue 2, pp. 1129-1135.

Astronomy and Astrophysics

Astronomy

13

Sun: Activity, Sun: Magnetic Fields, Sun: Sunspots

Scientific paper

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 the implied handedness of that motion. We were able to coregister 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.

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