Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...155..178k&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 155, no. 1, Jan. 1986, p. 178-184.
Astronomy and Astrophysics
Astrophysics
26
Chromosphere, H Alpha Line, Line Shape, Magnetohydrodynamic Turbulence, Solar Oscillations, Temporal Distribution, Astronomical Photography, Filtergrams, Spectral Energy Distribution, Stellar Spectrophotometry
Scientific paper
H-alpha observations of the quiet solar chromosphere at disk center are presented, including a 9 min time sequence of photographic filtergrams in line center and + or - 0.5 A and a 54 min sequence of photographic spectrograms. The very different dynamical behavior of the interior and boundary of the network cells is emphasized. The dominant processes in the interior are waves in the 5 min period range and with shorter periods. The energy flux in these waves is estimated to be too small to account for the radiative losses from standard chromospheric models. In the cell boundaries, the material flows down, on time average, near the centers of rosettes. The short time fluctuations are mainly stochastic while the oscillations are reduced. This suggests that the energy balance in the cell boundaries is determined by MHD turbulence.
Kneer Franz
von Uexkuell M.
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