On the origin of the discrete character of the solar disk brightness in the 160 nanometer continuum

Details On the origin of the discrete character of the solar disk brightness in the 160 nanometer continuum On the origin of the discrete character of the solar disk brightness in the 160 nanometer continuum

Apr 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...279..848f&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 279, April 15, 1984, p. 848-856.

Computer Science

Performance

31

Brightness Distribution, Chromosphere, Modulation Transfer Function, Solar Magnetic Field, Ultraviolet Photography, Solar Temperature, Statistical Analysis, Sun

Scientific paper

The performance of the Transition Region Camera (TRC) is evaluated with respect to spatial resolution in order to arrive at a more refined description of the 160 nm features. The origins of the ultraviolet-bright grains observed in the interior of the supergranulation cells and of the bright elements that delineate the network are investigated. It is believed that the network elements and the cell grains have different origins. The network elements may appear bright as a consequence of the Wilson effect at the top of concentrated magnetic flux tubes. The magnetic field intensity deduced on the assumption that the tubes are thermalized with their surroundings is 120 G, which corresponds to an intensity of 1.5 kG at the photospheric level. The cell grains cannot be of magnetic origin because the magnetic field intensity they would require would be too high. It is suggested that they are the trace of a local dissipation of energy contained in periodic motions.

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