Are Astrophysical Shear Flows Able to Heat Themselves?

Details Are Astrophysical Shear Flows Able to Heat Themselves? Are Astrophysical Shear Flows Able to Heat Themselves?

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004ap%26ss.293..189r&link_type=abstract

Astrophysics and Space Science, v. 293, Issue 1, p. 189-196 (2004).

Astronomy and Astrophysics

Astrophysics

7

Astrophysical Shear Flows, Solar Jet Flows, Stellar Jets, Extragalactic Jets

Scientific paper

The mechanism of the shear-induced nonmodal self-heating of flows is described. This phenomenon comprises three essential steps: (i) waves and/or vortices get excitedwithin a flow; (ii) they amplify nonmodally, due to the presence of the shear flow, extracting a part of the flow kinetic energy; (iii) high amplitude waves and/or transiently amplified vortices undergo viscous decay and/or magnetic diffusion and give, in the form of the heat, a part of their excessive energy back to the flow. I argue that this phenomenon may play a formidable role in the dynamics of different, especially kinematically complex, astrophysical shear flows (ASF), viz: swirling macrospicules in the Solar atmosphere (solar tornados), galactic (stellar) and extragalactic jets.

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