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http://hdl.handle.net/2248/4787
Title: | Quiet-Sun variability with the solar cycle |
Authors: | Kariyappa, R |
Keywords: | Irradiance Variations Bright Points Network Oscillations Modulation Region |
Issue Date: | 1999 |
Publisher: | Astronomical Society of the Pacific |
Citation: | Rimmele, T. R, Balasubramaniam, K. S and Radick, R. R, eds., High resolution solar physics: theory, observations and techniques, Proceedings of ASP Conference Series Vol. 183, 28 Aug - 2 Oct, New Mexico, USA, 1998, pp. 501 - 506 |
Series/Report no.: | Astronomical Society of the Pacific Conference Series; Vol. 183 |
Abstract: | In evaluating the contribution of various chromospheric features to total CaII K-emission flux and UV irradiance variability, the quiet-Sun is also one of the essential and important component. We have segregated the disc center intensity in a quiet-network and intranetwork regions, considered as a quiet-Sun component, from a digitized Call K-spectroheliograms of 1992 and 1980, observed at the National Solar Observatory at Sacramento Peak. It is shown, for the first time in the K-line, that the longer-term variation of the quiet-Sun during the solar activity cycle is in phase with the full-disk K-emission flux (the spatial K index), and UV irradiance measured in MgII h and k lines. Thus, it indicates that the quiet-Sun will contribute in the variations of UV irradiance, and its contribution should be taken into account in UV irradiance models. Using a standard FFT time series analysis, our results show, for the first time, the 51-day periodicity in the quiet-Sun variability. This evidence suggests that the 51-day period may be related to a new emerging weak magnetic fields, and the emission flux disappearance continues in the quiet-Sun regions at a slower rate. In addition, the variability of the chromospheric quiet-Sun suggest that it is very dynamic, not quiet, and is crucial for understanding of the chromosphere itself. |
Description: | Open Access |
URI: | http://hdl.handle.net/2248/4787 |
ISBN: | 1-58381-009-9 |
Appears in Collections: | IIAP Publications |
Files in This Item:
File | Description | Size | Format | |
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Quiet-Sun Variability with the Solar Cycle | Open Access | 540.26 kB | Adobe PDF | View/Open |
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