High temporal and spatial resolution observations from the Rapid Oscillations in the Solar Atmosphere (ROSA) multiwavelength imager on the Dunn Solar Telescope are used to study the velocities of small-scale H{\alpha} jets in an emerging solar active region. The dataset comprises of simultaneous imaging in the H{\alpha} core, Ca II K, and G band, together with photo- spheric line-of-sight magnetograms. Time-distance techniques are employed to determine projected plane-of-sky velocities. The H{\alpha} images are highly dynamic in nature, with estimated jet velocities as high as 45 km s^{-1}. These jets are one-directional, with their origin seemingly linked to underlying Ca II K brightenings and G-band magnetic bright points. It is suggested that the siphon flow model of cool coronal loops is suitable for the interpretation of our observations. The jets are associated with small-scale explosive events, and may provide a mass outflow from the photosphere to the corona.
@article{arxiv.1108.1043,
title = {Small-scale H{\alpha} Jets in the Solar Chromosphere},
author = {D. Kuridze and M. Mathioudakis and D. B. Jess and S. Shelyag and D. J. Christian and F. P. Keenan and K. S. Balasubramaniam},
journal= {arXiv preprint arXiv:1108.1043},
year = {2015}
}
Comments
5 pages, 5 figures, accepted in Astronomy and Astrophysics