Abstract
view Abstract Citations (35) References (29) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A Hillock and Cloud Model for Faculae Schatten, Kenneth H. ; Mayr, Hans G. ; Omidvar, Kazem ; Maier, Eugene Abstract A hillock model is used here to explain facular contrasts, allowing faculae to emit more energy than the surrounding unmagnetized photosphere. For downflows, horizontal motions converge near the photosphere and many fibril flux tubes are drawn together to form a large dark area, the sunspot. For upflows, the motions diverge near the photosphere and fibril flux tubes are dispersed over a larger area associated with faculae. The upflows transport material and energy, resulting in hotter than normal temperatures, which in turn cause the gas to expand compared with its surroundings. Buoyancy thus causes a 'network' of patchy hillocks, clouds, or geysers to form which allows the sun to reradiate the energy deficit associated with sunspots by locally increasing the effective surface area of the sun beyond that of a sphere. The consequences of this model for the physical form of the facular manifestation, the appearance of faculae from earth, and the 'energy balance' in active regions are addressed. Publication: The Astrophysical Journal Pub Date: December 1986 DOI: 10.1086/164786 Bibcode: 1986ApJ...311..460S Keywords: Faculae; Photosphere; Solar Atmosphere; Sunspots; Atmospheric Circulation; Flow Distribution; Solar Magnetic Field; Solar Physics; SUN: ATMOSPHERIC MOTIONS; SUN: FACULAE; SUN: SUNSPOTS full text sources ADS |
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