Small-Scale H-alpha Jets in the Solar Chromosphere (Postprint)
AIR FORCE GEOPHYSICS LAB SUNSPOT NM SOLAR RESEARCH BRANCH
Pagination or Media Count:
Aims 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 jets in an emerging solar active region. Methods The dataset comprises simultaneous imaging in the H core, Ca ii K, and G band, together with photospheric line-of-sight magnetograms. Time-distance techniques are employed to determine projected plane-of-sky velocities. Results The H 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. Conclusions It is suggested that the siphon flow model of cool coronal loops is suitable for interpreting our observations. The jets are associated with small-scale explosive events, and may provide a mass outflow from the photosphere to the corona.