The formation of small-scale umbral brightenings in sunspot atmospheres
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چکیده
منابع مشابه
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Context. Umbral Dots (UDs) are thought to be manifestations of magnetoconvection in sunspot umbrae. Recent advances in their theoretical description point to the need for a thorough study of their properties and evolution based on data with the highest currently achievable resolution. Aims. Our UD analysis aims to provide parameters such as lifetimes, diameters, horizontal velocities, and peak ...
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We have measured velocity maps of a round sunspot near the center of the solar disk. We derive the small-scale velocity field of the penumbra in the deep photosphere. Superimposed on a radial outflow, we find up– and downflows, which are associated with bright and dark features: The flow in the dark component of the penumbra has a larger inclination angle with respect to the surface normal than...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2017
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/201730467