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Intensity and Doppler velocity oscillations in pore atmospheres
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Cho, K.-S., Bong, S.-C., Nakariakov, V. M., Lim, E.-K., Park, Y.-D., Chae, J. C., Yang, H.-S., Park, H.-M. and Yurchyshyn, V. (2015) Intensity and Doppler velocity oscillations in pore atmospheres. The Astrophysical Journal, 802 (1). 45. doi:10.1088/0004-637X/802/1/45
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Official URL: http://dx.doi.org/10.1088/0004-637X/802/1/45
Abstract
We have investigated chromospheric traveling features running across two merged pores from their centers at speeds of about 55 km s−1, in the active region AR 11828. The pores were observed on 2013 August 24 by using high-time, spatial, and spectral resolution data from the Fast Imaging Solar Spectrograph of the 1.6 m New Solar Telescope. We infer a line-of-sight (LOS) velocity by applying the lambdameter method to the Ca ii 8542 Å band and Hα band, and investigate intensity and LOS velocity changes at different wavelengths and different positions at the pores. We find that they have three-minute oscillations, and the intensity oscillation from the line center (0.0 $\overset{\circ}{\rm A} $) is preceded by that from the core (−0.3 $\overset{\circ}{\rm A} $) of the bands. There is no phase difference between the intensity and the LOS velocity oscillations at a given wavelength. The amplitude of LOS velocity from the near core spectra (${\Delta }\lambda =0.10-0.21\;\overset{\circ}{\rm A} $) is greater than that from the far core spectra (${\Delta }\lambda =0.24-0.36\;\overset{\circ}{\rm A} $). These results support the interpretation of the observed wave as a slow magnetoacoustic wave propagating along the magnetic field lines in the pores. The apparent horizontal motion and a sudden decrease of its speed beyond the pores can be explained by the projection effect caused by inclination of the magnetic field with a canopy structure. We conclude that the observed wave properties of the pores are quite similar to those from the sunspot observations.
| Item Type: | Journal Article | ||||||||
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| Subjects: | Q Science > QB Astronomy | ||||||||
| Divisions: | Faculty of Science > Physics | ||||||||
| Library of Congress Subject Headings (LCSH): | Solar oscillations, Plasma waves | ||||||||
| Journal or Publication Title: | The Astrophysical Journal | ||||||||
| Publisher: | Institute of Physics Publishing, Inc. | ||||||||
| ISSN: | 0004-637X | ||||||||
| Official Date: | 19 March 2015 | ||||||||
| Dates: |
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| Volume: | 802 | ||||||||
| Number: | 1 | ||||||||
| Article Number: | 45 | ||||||||
| DOI: | 10.1088/0004-637X/802/1/45 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Open Access | ||||||||
| Funder: | National Research Foundation of Korea (NRF), European Research Council (ERC), Science and Technology Facilities Council (Great Britain) (STFC), Korea (South). Kyoyuk Kwahak Kisulbu [Ministry of Education, Science and Technology] (MEST) | ||||||||
| Grant number: | 2012R1A2A1A03670387 (NRF), 321141 (ERC), ST/L000733/1 (STFC) | ||||||||
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