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In Nguyen et al. [2002] and Feldman et al. [2003], fire and explosion were modeled by incompressible Euler equations. The latter used nonzero velocity divergence to capture fluid expansion during explosion. Cloud simulation was modeled by Boussinesq’s equations in Miyazaki et al. [2002]. At first glance, the similarities between neutral fluids and plasma [Tang 2002] might suggest that the CFD formulation would be sufficient to model the behavior of both media. However, in order to perform predictive simulations of the dynamics of plasma phenomena, one must account for their distinctive features.

Given by γ ξ2 (α, β) = (1 − e− 240 , 2π ξ3 ), where ξ2 and ξ3 are uniformly distributed random numbers ∈ [0, 1], and γ represents the initial thickness of the auroral stream. The accuracy and performance of the simulation is dependent on the number, N , of emission rays. Experiments show, however, asymptotic convergence of the results for larger values of N . The emissions mapped to the screen plane are scaled according to auroral spectral emission and intensity profiles [Baranoski et al. 2003], which correlate with the height of the emission point [Brekke and Egeland 1994].

Smoothness of subdivision on irregular meshes. Construt. Approx. 16, 3, 359–397. ¨ ZORIN, D. AND SCHRODER , P. 2001. A unified framework for primal/dual quadrilateral subdivision schemes. Comput. Aided Geomet. Design 18, 5, 429–454. Received September 2003; revised May 2004; accepted August 2004 ACM Transactions on Graphics, Vol. 24, No. 1, January 2005. Simulating the Dynamics of Auroral Phenomena GLADIMIR V. G. BARANOSKI and JUSTIN WAN University of Waterloo JON G. ROKNE University of Calgary and IAN BELL University of Waterloo Simulating natural phenomena has always been a focal point for computer graphics research.

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ACM Transactions on Graphics (January) by Association for Computing Machinery

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