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Angular Dependence of the Facular–Sunspot Coverage Relation as Derived by MDI Magnetograms
- Source :
- Solar Physics. 291:1957-1975
- Publication Year :
- 2016
- Publisher :
- Springer Science and Business Media LLC, 2016.
-
Abstract
- Previous studies have shown that the variation over the solar magnetic activity cycle of the area of facular/network features identified on broad band and narrow band imagery is positively correlated with the sunspot area and number, the relation between the area coverages being described as either linear or quadratic. On the other hand, the temporal variation of the spatial distributions of faculae, network and sunspots follows patterns that are less obviously correlated, so that we expect the relation that describes variation of the area coverage of different types of magnetic features to vary with the position over the disk. In this work we employ MDI full-disk magnetograms acquired during Cycle 23 and at the beginning of Cycle 24 to investigate the relation between the coverage of magnetic elements characterized by different amounts of magnetic flux and located at different angular distances from disk center with the sunspot number. In agreement with some previous studies we find that daily data are best described by a quadratic function while data averaged over 6-months are best described by a linear function. In both cases the coefficients of the fits show large dependence on the position over the disk and the magnetic flux. We also find that toward disk center 6-months averaged data show asymmetries between the ascending and the descending phase. Implications for solar irradiance modeling are discussed.<br />Comment: Accepted in Solar Physics
- Subjects :
- Physics
Sunspot
Linear function (calculus)
010504 meteorology & atmospheric sciences
FOS: Physical sciences
Solar cycle 23
Astronomy and Astrophysics
Astrophysics
Quadratic function
Solar irradiance
01 natural sciences
Magnetic flux
symbols.namesake
Astrophysics - Solar and Stellar Astrophysics
Space and Planetary Science
Position (vector)
0103 physical sciences
symbols
Astrophysics::Solar and Stellar Astrophysics
010303 astronomy & astrophysics
Doppler effect
Solar and Stellar Astrophysics (astro-ph.SR)
0105 earth and related environmental sciences
Subjects
Details
- ISSN :
- 1573093X and 00380938
- Volume :
- 291
- Database :
- OpenAIRE
- Journal :
- Solar Physics
- Accession number :
- edsair.doi.dedup.....ba1b71bc4f31ee7092e05c99026722f8