Observations of sausage modes in magnetic pores

Morton, Richard, Erdélyi, Robert, Jess, David and Mathioudakis, Mihalis (2011) Observations of sausage modes in magnetic pores. The Astrophysical Journal, 729 (2). L18. ISSN 0004-637X

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Official URL: http://dx.doi.org/10.1088/2041-8205/729/2/L18


We present here evidence for the observation of the magnetohydrodynamic (MHD) sausage modes in magnetic pores in the solar photosphere. Further evidence for the omnipresent nature of acoustic global modes is also found. The empirical decomposition method of wave analysis is used to identify the oscillations detected through a 4170 Å "blue continuum" filter observed with the Rapid Oscillations in the Solar Atmosphere (ROSA) instrument. Out of phase, periodic behavior in pore size and intensity is used as an indicator of the presence of magnetoacoustic sausage oscillations. Multiple signatures of the magnetoacoustic sausage mode are found in a number of pores. The periods range from as short as 30 s up to 450 s. A number of the magnetoacoustic sausage mode oscillations found have periods of 3 and 5 minutes, similar to the acoustic global modes of the solar interior. It is proposed that these global oscillations could be the driver of the sausage-type magnetoacoustic MHD wave modes in pores.

Item Type: Article
Uncontrolled Keywords: plasmas, Sun: photosphere, waves
Subjects: F300 Physics
F500 Astronomy
G100 Mathematics
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Dr Richard Morton
Date Deposited: 25 Oct 2012 16:28
Last Modified: 01 Aug 2021 01:50
URI: http://nrl.northumbria.ac.uk/id/eprint/9992

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