Sunspot, computer model

Sunspot, computer model

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Caption: Sunspot, computer model. Sunspots are cooler regions of the Sun's surface that appear dark against their brighter, hotter surroundings. They are concentrations of magnetic field and comprise a central cool umbra surrounded by warmer radial filaments, the penumbra. This model, based on a pair of sunspots, shows that the radial filaments result from hot plasma being guided outwards by a strong magnetic field with an inclination to the vertical exceeding 45 degrees. In this image the velocity of the outflow is colour-coded: red is a velocity of eight kilometres per second, going through pink to white, which is zero velocity, through light blue to dark blue, which is a velocity of negative 8 kilometres per second.

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Keywords: anisotropy, astronomical, astronomy, astrophysical, astrophysics, computer model, convective flow, cool region, filamentous, hot plasma, inclined magnetic field, numerical simulation, outflow, penumbra, radial, research, simulation, solar physics, solar surface, sun, sunspot, umbra, velocity

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