The velocity distribution of solar photospheric magnetic bright points

Keys, Peter, Mathioudakis, Mihalis, Jess, David, Shelyag, Sergiy, Crockett, Peter, Christian, Damian and Keenan, Francis (2011) The velocity distribution of solar photospheric magnetic bright points. The Astrophysical Journal Letters, 740 (2). L40. ISSN 2041-8205

1109.3565v1.pdf - Accepted Version

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We use high spatial resolution observations and numerical simulations to study the velocity distribution of solar photospheric magnetic bright points. The observations were obtained with the Rapid Oscillations in the Solar Atmosphere instrument at the Dunn Solar Telescope, while the numerical simulations were undertaken with the MURaM code for average magnetic fields of 200 G and 400 G. We implemented an automated bright point detection and tracking algorithm on the data set and studied the subsequent velocity characteristics of over 6000 structures, finding an average velocity of approximately 1 km s–1, with maximum values of 7 km s–1. Furthermore, merging magnetic bright points were found to have considerably higher velocities, and significantly longer lifetimes, than isolated structures. By implementing a new and novel technique, we were able to estimate the background magnetic flux of our observational data, which is consistent with a field strength of 400 G.

Item Type: Article
Additional Information: Reproduced by permission of the AAS.
Subjects: F300 Physics
F500 Astronomy
G100 Mathematics
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Sergiy Shelyag
Date Deposited: 23 May 2016 09:36
Last Modified: 01 Aug 2021 10:35

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