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Solar Physics

, Volume 288, Issue 1, pp 73–88 | Cite as

Chromospheric Sunspot Oscillations in Hα and Ca ii 8542 Å

  • Ram Ajor Maurya
  • Jongchul Chae
  • Hyungmin Park
  • Heesu Yang
  • Donguk Song
  • Kyuhyoun Cho
Initial Results from FISS

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.

Keywords

Oscillations, solar Chromosphere, active Sunspots, penumbra Sunspots, umbra Waves, propagation 

Notes

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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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • Ram Ajor Maurya
    • 1
  • Jongchul Chae
    • 1
  • Hyungmin Park
    • 1
  • Heesu Yang
    • 1
  • Donguk Song
    • 1
  • Kyuhyoun Cho
    • 1
  1. 1.Department of Physics and AstronomySeoul National UniversitySeoulRepublic of Korea

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