Quiet-Sun Variability In a Temperature Minimum Region

Details Quiet-Sun Variability In a Temperature Minimum Region Quiet-Sun Variability In a Temperature Minimum Region

Feb 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001apj...547l.179z&link_type=abstract

The Astrophysical Journal, Volume 547, Issue 2, pp. L179-L182.

Astronomy and Astrophysics

Astronomy

Line: Profiles, Sun: Atmosphere, Sun: Chromosphere

Scientific paper

The results of monthly monitoring Ca II K line profiles at a quiet-Sun region near solar disk center at Kitt Peak during about two solar cycles since 1974 are presented to investigate the variations of K1 emission, which is strongly dependent on the temperature minimum region (TMR). Cyclic variations are found in K1 emission that are similar to those in the sunspot numbers. However, there is an evident time lag of about 1.2 yr between the K1 emission and the sunspot numbers. Non-LTE computations show that the corresponding temperature variation and position fluctuation in the quiet-Sun TMR region are estimated to be about 17 K and 1.7×10-2 g cm-2, respectively.

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