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- W2010659008 abstract "We present observations taken with the Advanced Stokes Polarimeter (ASP) in active-region plages and study the frequency distribution of the magnetic field strength (B), inclination with respect to vertical (γ), azimuthal orientation (χ), and filling factor (f). The most common values at disk center are B = 1400 G, γ < 10°, no preferred east-west orientation, and f = 15%. At disk center, there is a component of weak (<1000 G), more horizontal fields that corresponds to arching field lines connecting footpoints of different polarities. The center-to-limb variation (CLV) of the field strength shows that, close to the limb (μ = 0.3), the field strength is reduced to 800 G from its disk-center value. This can be interpreted as a gradient of B with height in solar plages of around -3 G km-1. From this CLV study, we also deduce that magnetic field lines remain vertical for the entire range of heights involved. A similar analysis is performed for structures found in active regions that show a continuous distribution of azimuths (resembling sunspots) but that do not have a darkening in continuum. These azimuth centers show slightly larger values of B than normal plages, in particular at their magnetic center. Filling factors are also larger on average for these structures." @default.
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- W2010659008 date "1997-01-10" @default.
- W2010659008 modified "2023-10-17" @default.
- W2010659008 title "Active Region Magnetic Fields. I. Plage Fields" @default.
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- W2010659008 doi "https://doi.org/10.1086/303478" @default.
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