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Astron. Astrophys. 320, 605-611 (1997)

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Intergranular plumes and formation of network bright points

Th. Roudier 1, J.M. Malherbe 2, L. November 3, J. Vigneau 4, G. Coupinot 1, M. Lafon 1 and R. Muller 1

1 Observatoire Midi-Pyrénées, UMR 5572 Pic du Midi, F-65201 Bagnères de Bigorre, France
2 Observatoire de Meudon, URA 2080, DASOP, F-92195 Meudon, France
3 National Solar Observatory, Sacramento Peak, Sunspot, NM88349, USA
4 Observatoire Midi-Pyrénées, UMR 5572 Pic du Midi, F-31400 Toulouse, France

Received 31 July 1996 / Accepted 21 August 1996


We discuss the temporal evolution of the photospheric intergranular lanes using a 1 hour time sequence of white-light images of solar granulation. The time series was obtained with the 50 cm refractor at the turret dome of the Pic du Midi Observatory. Analysis reveals the existence of singularities in the intergranular lanes that we call "intergranular holes". Intergranular holes, which have diameters between 0.24 arcsec and 0.45 arcsec, are continuously visible for more than 45 minutes. The holes appear to be systematically distributed at the periphery of mesogranular and supergranular cells. Our study reveals the formation of bright points (BPs) in 4 out of 14 cases studied very close to the intergranular holes, suggesting that intergranular holes may be the locations where magnetic flux tubes are formed.

Key words: Sun: granulation – photosphere – methods: data analysis – convection

Send offprint requests to: Th. Roudier

© European Southern Observatory (ESO) 1997

Online publication: June 30, 1998