Subsurface Vortices Research Articles

Flux lattice and vortex structure in 2H-NbSe2 in inclined fields.

The structure's of the flux-line lattice and of individual vortices on the surface of a uniaxial anisotropic superconductor 2H-${\mathrm{NbSe}}_{2}$ are studied for arbitrary magnetic fields using the scanning tunneling microscope. The basis vectors show a distortion consistent with bulk anisotropic London theory, however, their angular orientation with respect to the tilt direction differs by about 30\ifmmode^\circ\else\textdegree\fi{} from that predicted. Various lattice-buckling instabilities are observed when the field is inclined more than 80\ifmmode^\circ\else\textdegree\fi{} away from the c axis. The star-shaped structure of the core distorts into a spiky comet shape as the field is tilted into the plane. If the field is along the surface (perpendicular to the c axis), evenly spaced parallel streaks reveal the subsurface vortex spacing.

Vortex attraction and the formation of sunspots

view Abstract Citations (26) References (26) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Vortex Attraction and the Formation of Sunspots Parker, E. N. Abstract A downdraft vortex ring in a stratified atmosphere exhibits universal attraction for nearby vertical magnetic flux bundles. It is speculated that the magnetic fields emerging through the surface of the sun are individually encircled by one or more subsurface vortex rings, providing an important part of the observed clustering of magnetic fibrils to form pores and sunspots. Publication: The Astrophysical Journal Pub Date: May 1992 DOI: 10.1086/171279 Bibcode: 1992ApJ...390..290P Keywords: Magnetic Flux; Magnetohydrodynamics; Solar Atmosphere; Solar Magnetic Field; Sunspots; Vortex Rings; Atmospheric Stratification; Boussinesq Approximation; Magnetic Field Configurations; Magnetohydrodynamic Flow; Solar Physics; MAGNETOHYDRODYNAMICS: MHD; SUN: MAGNETIC FIELDS; SUN: SUNSPOTS full text sources ADS |

Buoyant thermocapillary flow with nonuniform supra-heating. I - Liquid-phase behavior. II - Two-phase behavior

The present computational study of transient heat transfer and fluid flow in a circular pool of n-decane which is undergoing central radiative heating from above gives attention to the volumetric absorption of the radiation incident on the pool surface. The first part of this study notes that buoyancy influences the number and recirculation rates of the subsurface vortices by stabilizing hot subsurface fluid above the colder core fluid; this affects the liquid surface temperature profile and in turn governs the velocity profile that is due to thermocapillarity. In the second part, the effects of gas-liquid phase coupling, variable density and thermophysical properties, and vaporization are considered.