Abstract
We study Ca ii K profiles in structural features of the quiet chromosphere and plages using observations of two time series for two regions at the base of a coronal hole. One of the regions that we study has a low-brightness area where the reversal-free profile shape remains the same even over a spatial extent of about 16 arcsec. Such a profile shape is typical of low-temperature areas.
The analysis of the spectral composition of oscillations has revealed that all the chromospheric structures feature various combinations of periods: 3, 4, 5, and long. One rarely finds only a single period. In same-type structures, we cannot single out a dominant highest-power period; such may be any of the above periods. Periodic brightenings of the violet peak in the Ca ii K wing occur in both internetwork and network areas. Moreover, they do not arise from purely 3-min oscillations.
The integrated spectral power of oscillations throughout the whole area cut out by the spectrograph slit decreases with height from the temperature minimum region to the lower and middle chromosphere in 4.0 – 5.2 (4-min oscillations), 2.4 – 4.0 (5-min oscillations) and 1.1 – 16.0 mHz frequency bands. The oscillation power in the low-frequency band demonstrates a reverse tendency. The oscillation power in 5.2 – 6.8 mHz (3-min oscillations) decreases from the lower to middle chromosphere. This is the case for both regions at the base of a coronal hole.
The integrated spectral power distribution in different chromospheric structures is complicated. Low-frequency oscillations are enhanced more often in peripheral areas of structures. Our observations do not corroborate the belief that 3-min oscillations prevail in internetwork and 5-min oscillations in network areas.
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Acknowledgements
We are grateful to the referee for detailed comments and valuable suggestions on an earlier version of this paper. We thank O.A. Kulish for her assistance with preparing the English version of the manuscript. We would like to thank the SOHO for their open data policy. SOHO is a project of international cooperation between ESA and NASA.
This work was supported by the SB RAS Presidium Programs No. 3 and No. II.16.3.3.
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Grigoryeva, S.A., Turova, I.P. & Ozhogina, O.A. Studying Ca ii K Line Profile Shapes and Dynamic Processes in the Solar Chromosphere at the Base of a Coronal Hole. Sol Phys 291, 1977–2002 (2016). https://doi.org/10.1007/s11207-016-0951-9
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DOI: https://doi.org/10.1007/s11207-016-0951-9