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Chromospheric Sunspot Oscillations in Hα and Ca ii 8542 Å

  • Initial Results from FISS
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Abstract

We study chromospheric oscillations including umbral flashes and running penumbral waves in a sunspot of active region NOAA 11242 using scanning spectroscopy in Hα and Ca ii 8542 Å with the Fast Imaging Solar Spectrograph (FISS) at the 1.6 meter New Solar Telescope at the Big Bear Solar Observatory. A bisector method is applied to spectral observations to construct chromospheric Doppler-velocity maps. Temporal-sequence analysis of these shows enhanced high-frequency oscillations inside the sunspot umbra in both lines. Their peak frequency gradually decreases outward from the umbra. The oscillation power is found to be associated with magnetic-field strength and inclination, with different relationships in different frequency bands.

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Acknowledgements

HMI data are courtesy of NASA/SDO and the HMI science team. We thank the anonymous referee for their comments and important suggestions that helped to improve the quality of the manuscript. This work was support by the National Research Foundation of Korea (2011-0028102).

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Correspondence to Ram Ajor Maurya.

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Initial Results from FISS

Guest Editor: Jongchul Chae

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Maurya, R.A., Chae, J., Park, H. et al. Chromospheric Sunspot Oscillations in Hα and Ca ii 8542 Å. Sol Phys 288, 73–88 (2013). https://doi.org/10.1007/s11207-013-0286-8

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  • DOI: https://doi.org/10.1007/s11207-013-0286-8

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