dc.contributor.author |
Kariyappa, R |
|
dc.date.accessioned |
2009-09-03T16:51:23Z |
|
dc.date.available |
2009-09-03T16:51:23Z |
|
dc.date.issued |
1999 |
|
dc.identifier.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 |
en |
dc.identifier.isbn |
1-58381-009-9 |
|
dc.identifier.uri |
http://hdl.handle.net/2248/4787 |
|
dc.description |
Open Access |
|
dc.description.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. |
en |
dc.language.iso |
en |
en |
dc.publisher |
Astronomical Society of the Pacific |
en |
dc.relation.ispartofseries |
Astronomical Society of the Pacific Conference Series; Vol. 183 |
|
dc.relation.uri |
http://adsabs.harvard.edu/abs/1999ASPC..183..501K |
en |
dc.rights |
© Astronomical Society of the Pacific |
en |
dc.subject |
Irradiance Variations |
en |
dc.subject |
Bright Points |
en |
dc.subject |
Network |
en |
dc.subject |
Oscillations |
en |
dc.subject |
Modulation |
en |
dc.subject |
Region |
en |
dc.title |
Quiet-Sun variability with the solar cycle |
en |
dc.type |
Article |
en |