Small-scale Hαjets in the solar chromosphere

Kuridze, David, Mathioudakis, Mihalis, Jess, David, Shelyag, Sergiy, Christian, Damian, Keenan, Francis and Balasubramaniam, Karatholuvu (2011) Small-scale Hαjets in the solar chromosphere. Astronomy & Astrophysics, 533. A76. ISSN 0004-6361

Preview	Text (Article) 1108.1043v1.pdf - Accepted Version Download (3MB) | Preview
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Abstract

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 Hα jets in an emerging solar active region.

Methods:
The dataset comprises of simultaneous imaging in the Hα 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 Hα 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 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.

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