2002 | OriginalPaper | Buchkapitel
Application of Multivariate Maxwellian Mixture Model to Plasma Velocity Distribution
verfasst von : Genta Ueno, Nagatomo Nakamura, Tomoyuki Higuchi, Takashi Tsuchiya, Shinobu Machida, Tohru Araki
Erschienen in: Progress in Discovery Science
Verlag: Springer Berlin Heidelberg
Enthalten in: Professional Book Archive
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Recent space plasma observations have provided us with three-dimensional velocity distributions having multiple peaks. We propose a method for analyzing such velocity distributions via a multivariate Maxwellian mixture model where each component of the model represents each of the multiple peaks. The parameters of the model are determined through the Expectation-Maximization (EM) algorithm. For the automatic judgment of the preferable number of components in the mixture model, we introduce a method of examining the number of extrema of a resulting mixture model. We show applications of our method to velocity distributions observed in the Earth’s magnetotail.