Variation of the facular and network contrast during the rising phase of cycle 23

Details Variation of the facular and network contrast during the rising phase of cycle 23 Variation of the facular and network contrast during the rising phase of cycle 23

Jun 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.508..185o&link_type=abstract

In: Proceedings of the SOHO 11 Symposium on From Solar Min to Max: Half a Solar Cycle with SOHO, 11-15 March 2002, Davos, Switze

Computer Science

1

Solar Activity, Irradiance Variations, Faculae, Network, Solar Activity, Irradiance Variations, Faculae, Network

Scientific paper

Magnetic activity contributes to solar irradiance variations, both on short and long time-scales. While sunspots and active region faculae are the dominant contributors to irradiance changes on time-scales of days to weeks, the origin of the long-term increase of the irradiance between activity minimum and maximum (~0.1%) is still debated. It has been proposed that the small-scale magnetic elements composing the enhanced and quiet network contribute substantially to this increase. To contribute to this debate, we attempt to see if there is a change in the radiative properties of these elements along the solar cycle, and to evaluate such a change. We use near-simultaneous full disk magnetograms and images of the photospheric continuum intensity provided by MDI/SOHO. We have studied the center-to-limb variations (CLV) of the contrast as a function of magnetic strength and we are now analyzing how the noise level of the images changes throughout time, as a preliminary step towards an analysis of the temporal irradiance variations.

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