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Small-scale Hα jets in the solar chromosphere

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journal contribution
posted on 2011-09-01, 00:00 authored by D Kuridze, M Mathioudakis, D B Jess, Sergiy ShelyagSergiy Shelyag, D J Christian, F P Keenan, K S Balasubramaniam
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 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 interpreting our observations. The jets are associated with small-scale explosive events, and may provide a mass outflow from the photosphere to the corona. © 2011 ESO.

History

Journal

Astronomy and astrophysics

Volume

533

Article number

A76

Pagination

1 - 5

Publisher

EDP Sciences

Location

London, Eng.

ISSN

0004-6361

eISSN

1432-0746

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2011, ESO