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Characteristics of the displacement of the penumbral bright grains of sunspots |
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| Authors: | R Muller |
| Institution: | (1) Observatoire du Pic du Midi, 65200 Bagnères de Bigorre, France |
| Abstract: | It is confirmed that the penumbral bright grains are moving towards the sunspots umbra. At the umbra-penumbra boundary their horizontal velocity is about 0.5 km s–1 and their displacement is inclined downwards with an angle of 5° to 20°. |
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