Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...208..290v&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 208, no. 1-2, Jan. 1989, p. 290-296.
Astronomy and Astrophysics
Astrophysics
31
Atmospheric Heating, Chromosphere, Solar Oscillations, Coherent Radiation, H Alpha Line, Power Spectra, Solar Magnetic Field
Scientific paper
A 64-min time sequence of disk center H-alpha spectrograms taken with the MSDP spectrograph at the Observatoire du Pic du Midi is analyzed. This type of spectrograph allows spectroscopy of a two-dimensional field of view. From the H-alpha line profiles at each pixel, line-shift and minimum intensity fluctuation are determined as functions of spatial and temporal coordinates. A frequency analysis with standard Fourier techniques is performed. It is confirmed that in the interior of the chromospheric network cells the oscillatory behavior dominates, whereas at the boundaries one generally finds random motions on scales of 2-10 arcsec. The random behavior of the H-alpha structures outlines the permanent rearrangement of the magnetic field lines pushed around by the subphotospheric granular flow.
Kneer Franz
Malherbe Jean-Marie
Mein Pierre
von Uexkuell M.
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