4.6 Article

High-frequency Oscillations in Small Magnetic Elements Observed with SUNRISE/SuFI

期刊

出版社

IOP Publishing Ltd
DOI: 10.3847/1538-4365/229/1/10

关键词

Sun: chromosphere; Sun: oscillations; Sun: photosphere; techniques: imaging spectroscopy

资金

  1. Bundesministerium fur Wirtschaft und Technologie through the Deutsches Zentrum fur Luft- und Raumfahrt e.V. (DLR) [50 OU 0401]
  2. Innovationsfond of the President of the Max Planck Society (MPG)
  3. Spanish MICINN [ES P2006-13030-006, AYA2009-14105-006]
  4. European FEDER funds
  5. NASA [NNX08AH38G]
  6. BK21 plus program through the National Research Foundation (NRF) - Ministry of Education of Korea
  7. Research Council of Norway

向作者/读者索取更多资源

We characterize waves in small magnetic elements and investigate their propagation in the lower solar atmosphere from observations at high spatial and temporal resolution. We use the wavelet transform to analyze oscillations of both horizontal displacement and intensity in magnetic bright points found in the 300. nm and the Ca II H 396.8 nm passbands of the filter imager on board the SUNRISE balloon-borne solar observatory. Phase differences between the oscillations at the two atmospheric layers corresponding to the two passbands reveal upward propagating waves at high frequencies (up to 30 mHz). Weak signatures of standing as well as downward propagating waves are also obtained. Both compressible and incompressible (kink) waves are found in the small-scale magnetic features. The two types of waves have different, though overlapping, period distributions. Two independent estimates give a height difference of approximately 450 +/- 100 km between the two atmospheric layers sampled by the employed spectral bands. This value, together with the determined short travel times of the transverse and longitudinal waves provide us with phase speeds of 29 +/- 2 km s(-1) and 31 +/- 2 km s(-1), respectively. We speculate that these phase speeds may not reflect the true propagation speeds of the waves. Thus, effects such as the refraction of fast longitudinal waves may contribute to an overestimate of the phase speed.

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