Large convection cells as the source of Betelgeuse's extended atmosphere
Article Abstract:
Radio observations of the supergiant star Betelgeuse indicate the temperature structure of the extended atmosphere from two to seven times the photospheric radius. The atmosphere close to the star has an irregular structure, while the temperature is consistent with the photospheric temperature but substantially lower than that of gas in the same region. It is concluded that the relatively cool gas responsible for the observed stellar radio emission spans the same height range as the hotter gas that creates the optical and ultraviolet chromospheric signatures.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1998
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Turbulent cascades in foreign exchange markets
Article Abstract:
Foreign exchange (FX) market dynamics closely resembles hydrodynamic turbulence. The information cascade in FX market dynamics relates to the energy cascade in turbulence. The dependence of the probability density of FX price changes on time delays is similar to the relationship between the probability density of the velocity differences of two points and their spatial separation in a turbulent flow. The analogy enables rationalization of the statistics of FX price differences to provide better option pricing in short-term speculative markets.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1996
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Turbulent convection at very high Rayleigh numbers
Article Abstract:
It has been possible to investigate the basic properties of heat transport by undertaking measurements over a very large range of Rayleigh numbers. The Rayleigh number scaling was established with much less ambiguity than previously.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2000
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