Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...314l..15d&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 314, March 1, 1987, p. L15-L19.
Astronomy and Astrophysics
Astrophysics
16
Chromosphere, Solar Granulation, Solar Oscillations, Benard Cells, Filtergrams, Fourier Analysis, Line Spectra, Spectrum Analysis, Temporal Resolution
Scientific paper
Two-dimensional filtergrams of a 90 x 90-arcsec solar field, obtained with time resolution 12 s and spatial resolution 1 arcsec using a Halle birefringent filter (bandwidth 60 pm) centered on the blue peak of the Ca II K line and a CCD array on the Vacuum Tower Telescope at Sacramento Peak Observatory in a 20-min observing run on November 11, 1983, are presented and analyzed. Cells of extent about 8 Mm (i.e., on the scale of mesogranulation) are observed and found to exhibit significant intensity variations of period 3-5 min, the phase cells determined by Fourier analysis being of about the same size as the observed structures. The possibility that mesogranulation may be closely related to the 5-min solar oscillation is discussed.
Dame Luc
Martic Milena
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