The intensity contrast of solar photospheric faculae and network elements : II. Evolution over the rising phase of solar cycle 23
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The intensity contrast of solar photospheric faculae and network elements : II. Evolution over the rising phase of solar cycle 23

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The intensity contrast of solar photospheric faculae and network elements : II. Evolution over the rising phase of solar cycle 23

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dc.contributor.author Ortiz, A.
dc.contributor.author Domingo Codoñer, Vicente
dc.contributor.author Sanahuja, B.
dc.date.accessioned 2010-06-29T10:29:31Z
dc.date.available 2010-06-29T10:29:31Z
dc.date.issued 2006
dc.identifier.uri http://hdl.handle.net/10550/13988
dc.description.abstract We studied the radiative properties of small magnetic elements (active region faculae and the network) during the rising phase of solar cycle 23 from 1996 to 2001, determining their contrasts as a function of heliocentric angle, magnetogram signal, and the solar cycle phase. We combined near-simultaneous full disk images of the line-of-sight magnetic field and photospheric continuum intensity provided by the MDI instrument on board the SOHO spacecraft. Sorting the magnetogram signal into different ranges allowed us to distinguish between the contrast of different magnetic structures. We find that the contrast center-to-limb variation (CLV) of these small magnetic elements is independent of time with a 10% precision, when measured during the rising phase of solar cycle 23. A 2-dimensional empirical expression for the contrast of photospheric features as a function of both the position on the disk and the averaged magnetic field strength was determined, showing its validity through the studied time period. A study of the relationship between magnetogram signal and the peak contrasts shows that the intrinsic contrast (maximum contrast per unit of magnetic flux) of network flux tubes is higher than that of active region faculae during the solar cycle. en
dc.language.iso en en
dc.relation http://www.aanda.org/articles/aa/pdf/2006/22/aa3869-05.pdf en
dc.source ORTIZ, A. ; Domingo Codoñer, Vicente ; Sanahuja, B., 2006, The intensity contrast of solar photospheric faculae and network elements : II. Evolution over the rising phase of solar cycle 23, Astronomy and Astrophysics, vol. 452, no. 1, p. 311–319 en
dc.subject Sun activity ; Faculae ; Plages ; Sun ; Magnetic fields en
dc.title The intensity contrast of solar photospheric faculae and network elements : II. Evolution over the rising phase of solar cycle 23 en
dc.type info:eu-repo/semantics/article en
dc.type info:eu-repo/semantics/publishedVersion en
dc.subject.unesco UNESCO::ASTRONOMÍA Y ASTROFÍSICA en
dc.subject.unesco UNESCO::ASTRONOMÍA Y ASTROFÍSICA::Sistema solar en
dc.identifier.doi 10.1051/0004-6361:20053869 en
dc.description.private Domingo Codoñer, Vicente, Vicente.Domingo-Codonyer@uv.es en
dc.identifier.idgrec 037331 en

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