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- W3105765504 abstract "Observations in space plasmas reveal particle velocity distributions out of thermal equilibrium, with anisotropies (e.g., parallel drifts or/and different temperatures, $T_parallel$ - parallel and $T_perp$ - perpendicular, with respect to the background magnetic field), and multiple quasithermal and suprathermal populations with different properties. The recently introduced (isotropic) $kappa$-cookbook is generalized in the present paper to cover all these cases of anisotropic and multi-component distributions reported by the observations. We derive general analytical expressions for the velocity moments and show that the common (bi-)Maxwellian and (bi-)$kappa-$distributions are obtained as limiting cases of the generalized anisotropic $kappa$-cookbook (or recipes). Based on this generalization, a new 2D fitting procedure is introduced, with an improved level of confidence compared to the 1D fitting methods widely used to quantify the main properties of the observed distributions. The nonlinear least-squares fit is led{applied to electron data sets} measured by the Ulysses spacecraft confirming the existence of three different populations, a quasithermal core and two suprathermal (halo and strahl) components. In general, the best overall fit is given by the sum of a Maxwellian and two generalized $kappa$-distributions." @default.
- W3105765504 created "2020-11-23" @default.
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- W3105765504 date "2020-11-24" @default.
- W3105765504 modified "2023-09-26" @default.
- W3105765504 title "Generalized anisotropic κ-cookbook: 2D fitting of Ulysses electron data" @default.
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- W3105765504 doi "https://doi.org/10.1093/mnras/staa3641" @default.
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