A Numerical Characterization of the Gravito-Electrostatic Sheath Equilibrium Structure in Solar Plasma

• 作者: Chandra Bhushan Dwivedi Pralay Kumar Karmakar
• 来源期刊: 天文学与天体物理学国际期刊(英文)
• 学科: 数学
• 关键词: SUN SOLAR Wind PLASMA Gravito-Electrostatic Coupling Processes INHOMOGENEITY Scale Lengths SOLAR Interior PLASMA Gravito-Electrostatic SHEATH SOLAR Models Electromagnetic SUN
• 年，卷（期）: 2011,（4）
• 页码范围: 210-231
• 页数: 22页
• 分类号: O1

摘要

This article describes the equilibrium structure of the solar interior plasma (SIP) and solar wind plasma (SWP) in detail under the framework of the gravito-electrostatic sheath (GES) model. This model gives a precise definition of the solar surface boundary (SSB), surface origin mechanism of the subsonic SWP, and its supersonic acceleration. Equilibrium parameters like plasma potential, self-gravity, population density, flow, their gradients, and all the relevant inhomogeneity scale lengths are numerically calculated and analyzed as an initial value problem. Physical significance of the structure condition for the SSB is discussed. The plasma oscillation and Jeans time scales are also plotted and compared. In addition, different coupling parameters, and electric current profiles are also numerically studied. The current profiles exhibit an important behavior of directional reversibility, i.e., an electrodynamical transition from negative to positive value. It occurs beyond a few Jeans lengths away from the SSB. The virtual spherical surface lying at the current reversal point, where the net current becomes zero, has the property of a floating surface behavior of the real physical wall. Our investigation indicates that the SWP behaves as an ion current-carrying plasma system. The basic mechanism behind the GES formation and its distinctions from conventional plasma sheath are discussed. The electromagnetic properties of the Sun derived from our model with the most accurate available inputs are compared with those of others. These results are useful as an input element to study the properties of the linear and nonlinear dynamics of various solar plasma waves, oscillations and instabilities.