Observations of Sausage Modes in Magnetic Pores

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 osci...

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Bibliographic Details
Published in:Astrophysical journal. Letters 2011-03, Vol.729 (2), p.L18-jQuery1323918160270='48'
Main Authors: Morton, R. J, Erdélyi, R, Jess, D. B, Mathioudakis, M
Format: Article
Language:English
Subjects:
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
ATMOSPHERES
FLUID MECHANICS
HYDRODYNAMICS
HYDROMAGNETIC WAVES
MAGNETOACOUSTIC WAVES
MAGNETOHYDRODYNAMICS
MECHANICS
OSCILLATION MODES
OSCILLATIONS
PHOTOSPHERE
SOLAR ATMOSPHERE
STELLAR ATMOSPHERES
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Summary: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 A '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.
ISSN:2041-8205
2041-8213
DOI:10.1088/2041-8205/729/2/L18