Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....64..219h&link_type=abstract
Astronomy and Astrophysics, vol. 64, no. 1-2, Mar. 1978, p. 219-234.
Astronomy and Astrophysics
Astrophysics
9
Magnetohydrodynamic Stability, Plasma Turbulence, Solar Corona, Solar Flares, Plasma Layers, Plasma Pinch, Two Dimensional Flow
Scientific paper
The paper discusses the physics of current sheet formation in regions of contact between old and new flux; this formation occurs during flux emergence from the solar photosphere into the corona. Particular attention is paid to the case of fast emergence, in which, at first, no field-line reconnection can take place. It is shown to be almost impossible to trigger microturbulence in the one-dimensional phase of sheet development. An approximation based on the fact that the sheet is very long and very thin is used to study analytically the two-dimensional phase of flow induced by compression. It is shown that the flow evacuates the region of the sheet where the pinching is strongest, and that the conditions for microturbulence are easily fulfilled there after some time. The behavior of the current sheet after turbulence sets in is considered.
Heyvaerts Jean
Kuperus Max
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