Magnetic shear. IV - Hale regions 16740, 16815, and 16850

Abstract

view Abstract Citations (10) References (10) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Magnetic Shear. IV. Hale Regions 16740, 16815, and 16850 Athay, R. G. ; Klimchuk, J. A. ; Jones, H. P. ; Zirin, H. Abstract Dopplergrams made in C IV 1548 A are studied for evidence of velocity shear near H-alpha dark filaments and for large-scale flow convergent on active regions. The three regions studied support earlier conclusions that shear is a common property of active regions and that active regions may be the foci of converging plasma flow. Flow patterns near filaments show divergence or convergence as well as shear. Also the sense of the shear can be either cyclonic or anticyclonic. No preference is noted for convergence or divergence or for a particular sense of shear, and there appears to be no correlation between the sense of the shear and the sign of the velocity gradient normal to the filament. The close association of H-alpha dark filaments with shear lines leads to the suggestion that the filaments may arise from a cooling instability induced by the Bernoulli effect. Publication: The Astrophysical Journal Pub Date: April 1986 DOI: 10.1086/164136 Bibcode: 1986ApJ...303..884A Keywords: Atmospheric Circulation; Solar Atmosphere; Solar Magnetic Field; Sunspots; Doppler Effect; Magnetohydrodynamic Flow; Shear Flow; Velocity Distribution; Solar Physics; SUN: ATMOSPHERIC MOTIONS; SUN: MAGNETIC FIELDS; SUN: SUNSPOTS full text sources ADS | Related Materials (3) Part 1: 1985ApJ...288..363A Part 2: 1985ApJ...291..344A Part 3: 1986ApJ...303..877A