Suprathermal Velocity Distributions in the Transition Region: The Foundation of the Velocity Filtration Model of the Corona

过渡区的超热速度分布：日冕速度过滤模型的基础

• 批准号: 9320623
• 负责人: Jack Scudder
• 金额: $ 11万
• 依托单位: University of Iowa
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-06-01 至 1997-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9320623&HistoricalAwards=false
• 关键词: Suprathermal; Velocity; Distributions; Transition; Region

9320623 Scudder In this proposal the PIs seek funding to develop direct theoretical arguments that the base of the transition region is an especially fertile site for the suprathermal tail formation assumed by the velocity filtration theory. The vehicle that "carries" the embryonic coronal gas is the suprathermal tail of the fully ionized gas as it leaves the top of the chromosphere and that the mechanism for the emergence of hot gas overlying cooler gas is the concentrating effect velocity filtration has on the spatial evolution of non-thermal distributions in an attractive potential well. In this view, the combined effects of (1) the copious waves leading up to the TR base, (2) the convolution effects possible in a stratified fully ionized plasma below the base, and (3) the quasi-neutrality in the presence of coulomb collisions all leave their "imprint" on the velocity distributions that are the boundary conditions for the fully ionized extension of the solar atmosphere. The velocity distribution functions evolve above the TR base in the electric and magnetic force fields above this region as if they were in a "velocity dependent reflecting transmission line" that preferentially filters out the low energy particles in deference to the higher energy particles of the initially suprathermal populations. These populations by velocity filtration get concentrated and their dispersion and hence their temperature increases without any further energy addition above the base of the transition region. ***

9320623斯卡德在这项提议中，私人投资者寻求资金，以发展直接的理论论证，即过渡区域的底部是速度过滤理论假设的过热尾部形成的特别肥沃的地点。“携带”胚胎日冕气体的飞行器是完全电离气体离开色球顶部时的过热尾巴，而覆盖在较冷气体之上的热气体的出现机制是速度过滤对吸引势井中非热分布的空间演化的集中效应。在这个观点中，(1)通向Tr底的丰富波，(2)在底部以下的分层完全电离等离子体中可能产生的卷积效应，以及(3)在库仑碰撞存在下的准中性的综合效应，都在速度分布上留下了“印记”，这些速度分布是太阳大气完全电离扩展的边界条件。在这个区域上方的电力场和磁场中，速度分布函数在tr基座上方演化，就好像它们处于一条“与速度相关的反射传输线”中，该传输线优先过滤掉低能粒子，而不是初始过热粒子中的高能粒子。这些粒子群通过速度过滤得到集中，它们的弥散，因此它们的温度升高，而不需要在过渡区底部上方增加任何进一步的能量。***