Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 729, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/729/2/L18
Keywords
plasmas; Sun: photosphere; waves
Categories
Funding
- NSF, Hungary [K67746]
- Science and Technology Facilities Council (STFC), UK
- National Science Foundation
- Science and Technology Facilities Council [ST/G004986/1, ST/F002327/1, ST/F002270/1, ST/I00341X/1] Funding Source: researchfish
- STFC [ST/G004986/1, ST/I00341X/1, ST/F002327/1, ST/F002270/1] Funding Source: UKRI
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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 angstrom 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.
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