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26 April 2024 |
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Phase diversity restoration of sunspot images I. Relations between penumbral and photospheric features | | J. A. Bonet
; I. Marquez
; R. Muller
; M. Sobotka
; A. Tritschler
; | | Date: |
27 May 2004 | | Subject: | astro-ph | | Affiliation: | 1,4), R. Muller , M. Sobotka , A. Tritschler (5,6) ( Instituto de Astrofisica de Canarias, Spain, Observatoire du Pic du Midi, France, Astronomical Institute, Academy of Sciences of the Czech Republic, Departamento de Análisis Matemáti | | Abstract: | We investigate the dynamics of and the relations between small-scale penumbral and photospheric features near the outer penumbral boundary: penumbral grains (PGs), dark penumbral fibrils, granules, and photospheric G-band bright points. The analysis is based on a 2 h time sequence of a sunspot close to disc center, taken simultaneously in the G-band and in the blue continuum at 450.7 nm. Observations were performed at the Swedish Vacuum Solar Telescope (La Palma) in July 1999. A total of 2564 images (46 arcsec x 75 arcsec) were corrected for telescope aberrations and turbulence perturbations by applying the inversion method of phase diversity. Our findings can by summarized as follows: (a) One third of the outward-moving PGs pass through the outer penumbral boundary and then either continue moving as small bright features or expand and develop into granules. (b) Former PGs and G-band bright points next to the spot reveal a different nature. The latter have not been identified as a continuation of PGs escaping from the penumbra. The G-band bright points are mostly born close to dark penumbral fibrils where the magnetic field is strong, whereas PGs stem from the less-magnetized penumbral component and evolve presumably to non-magnetic granules or small bright features. | | Source: | arXiv, astro-ph/0405542 | | Services: | Forum | Review | PDF | Favorites | |
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