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Long-Term Variation of the Corona in Quiet Regions

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Abstract

Using Hinode EUV Imaging Spectrometer (EIS) spectra recorded daily at Sun center from the end of 2006 to early 2011, we studied the long-term evolution of the quiet corona. The light curves of the higher temperature emission lines exhibit larger variations in sync with the solar activity cycle while the cooler lines show reduced modulation. Our study shows that the high temperature component of the corona changes in quiet regions, even though the coronal electron density remains almost constant there. The results suggest that heat input to the quiet corona varies with the solar activity cycle.

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Acknowledgements

Hinode is a Japanese mission developed and launched by ISAS/JAXA, with NAOJ as domestic partner and NASA and STFC (UK) as international partners. It is operated by these agencies in co-operation with ESA and NSC (Norway). JTM acknowledges support from the NASA Hinode contract with the Naval Research Laboratory.

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Correspondence to S. Kamio.

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Kamio, S., Mariska, J.T. Long-Term Variation of the Corona in Quiet Regions. Sol Phys 279, 419–426 (2012). https://doi.org/10.1007/s11207-012-0014-9

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Keywords

  • Corona, quiet
  • Solar cycle, observations
  • Spectral line, intensity and diagnostics