Observations of Sausage Modes in Magnetic Pores

R.J. Morton, R. Erdélyi, D. B. Jess, M. Mathioudakis

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48 Citations (Scopus)
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Abstract

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.
Original languageEnglish
Article numberL18
Number of pages4
JournalAstrophysical Journal Letters
Volume729
Issue number2
Early online date14 Feb 2011
DOIs
Publication statusPublished - 10 Mar 2011

Bibliographical note

The authors are also grateful to NSF, Hungary (OTKA, Ref. No. K67746) and the Science and Technology Facilities Council (STFC), UK for the financial support they received.

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

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