Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...254..426g&link_type=abstract
Astronomy and Astrophysics, Vol.254, NO. FEB(I), P. 426, 1992
Astronomy and Astrophysics
Astrophysics
1
Accretion Disks, Hydromagnetic Turbulence, Turbulent Spectrum, Disk Corona
Scientific paper
Assuming a preferred length scale at which energy flows from magnetohydrodynamic turbulence in a thin accretion disk to a magnetically coupled corona, we investigate the differences between the energy dissipated in the accretion disk and the energy flowing into the corona. The study shows that the turbulence is very stable even against a strong coronal energy sink. A weak coronal energy sink reduces the amplitude of the fluctuations in the turbulent energy.
The temporal spectra of the disk turbulence i.e. the dissipated energy and of the energy flowing into the corona are compared. The slopes of the power spectra of the energy which flows into the corona are steeper than those for the dissipated energy. A case of strong coronal coupling is further examined. Remarkable peaks occur in the Fourier spectra, which we identify with energy bursts in the total turbulent energy.
Geertsema G. T.
Kuperus Max
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