Physics
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992soph..141...27m&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 141, no. 1, p. 27-33.
Physics
46
Brightness Temperature, Filtergrams, Magnetic Signatures, Photosphere, Solar Granulation, Solar Magnetic Field, High Resolution, Solar Atmosphere, Solar Observatories, Sunspots
Scientific paper
Network bright points (NBPs) are tiny, subarcsecond, bright features, visible in high-resolution filtergrams taken in white light as well as in photospheric and chromospheric absorption lines. They form the photospheric network and are associated with kilogauss, concentrated magnetic fields. Their behavior is studied in a 3-hour, high-resolution granulation movie recorded at the Pic-du-Midi Observatory and processed at Lockheed Palo Alto Research Laboratory. The movie shows the important role played by granules. It appears that NBPs are formed in dark spaces when surrounding granules converge to fill this space. The formation is a fast phenomenon which lasts only 4 min. The lifetime of NBPs is 18 min on the average. About 15 percent of them split when they are squeezed between two expanding granules. Some consequences concerning the strength of the magnetic field during the formation of NBPs are discussed.
Müller Reto
Roudier Th.
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