Spatial aspect of wave transformations in astrophysical flows

Details Spatial aspect of wave transformations in astrophysical flows Spatial aspect of wave transformations in astrophysical flows

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...374..337b&link_type=abstract

Astronomy and Astrophysics, v.374, p.337-347 (2001)

Astronomy and Astrophysics

Astrophysics

11

Magnetohydrodynamics (Mhd), Waves

Scientific paper

The phenomenon of Shear Induced wave Transformations (SITs) (Chagelishvili et al. 1996), is a common feature of flows, sustaining n>1 mode of wave motion. Until now this ``nonmodal'' phenomenon was described only in terms of the time evolution of individual Fourier harmonics of perturbations in the space of wave numbers (k-space). In this paper we present the results of the first, direct numerical simulations of SITs, giving compelling evidence in favor of the robust and recognizable character of SITs. The importance of these results for an understanding of physical processes in astrophysical shear flows is pointed out. Namely, concrete astrophysical situations (solar plasma flows, galactic gaseous disks, accretion disks and accretion-ejection flows), where this approach may help to shed some light on observational appearances of related objects, are indicated and discussed.

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