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The umbra-penumbra area ratio of sunspots from the de la Rue data
The umbra-penumbra area ratio of sunspots from the de la Rue data
2005
J. M. Vaquero
S. Gordillo
M. C. Gallego
F. Sánchez Bajo
J. Antonio García
Keywords:
Astronomy
Astrophysics
Sunspot
Physics
Penumbra
Correction
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