Saturn’s polar hexagon

Temperature and composition of Saturn's polar hot spots and hexagon.

Saturn's poles exhibit an unexpected symmetry in hot, cyclonic polar vortices, despite huge seasonal differences in solar flux. The cores of both vortices are depleted in phosphine gas, probably resulting from subsidence of air into the troposphere. The warm cores are present throughout the upper troposphere and stratosphere at both poles. The thermal structure associated with the marked hexago...

A laboratory model of Saturn’s North Polar Hexagon

A hexagonal structure has been observed at 76 N on Saturn since the 1980s (Godfrey, D.A. [1988]. Icarus 76, 335–356). Recent images by Cassini (Baines, K., Momary, T., Roos-Serote, M., Atreya, S., Brown, R., Buratti, B., Clark, R., Nicholson, P. [2007]. Geophys. Res. Abstr. 9, 02109; Baines, K., Momary, T., Fletcher, L., Kim, J., Showman, A., Atreya, S., Brown, R., Buratti, B., Clark, R., Nicho...

Metastable Black Saturns Combining Everything (1) Becomes

Black Saturns have multiple horizons and so offer a testing ground for the ideas of black hole thermodynamics. In this note, we numerically scan for phases that are in equilibrium by extremizing total entropy in the 2-dimensional moduli space of stationary, singly rotating black Saturns with fixed total mass and angular momentum. On top of the known TH = TR, ΩH = ΩR configurations, we find phas...

The Classical Aristotelian Hexagon Versus the Modern Duality Hexagon

1 Aristotelian versus Duality Square (1) Piaget (1949) inversion réciprocation corrélation Gottschalk (1953) complement contradual dual Löbner (1990) negation (NEG) subnegation (SNEG) dual (DUAL) Westerstahl (2010) outer negation inner negation dual Quantifier (domain/restrictor, predicate/nuclear scope) 2-place second-order predicates All (children , be asleep) <,,t> (3) All children a...

Hexagon biquadrangle systems