Kinetic Simulations of Electron Instabilities in the Solar Corona

日冕电子不稳定性的动力学模拟

• 批准号: 235550657
• 负责人: Dr. Urs Ganse
• 金额: --
• 依托单位: Department of Physics and Astronomy
• 依托单位国家: 德国
• 项目类别: Research Fellowships
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/235550657?language=en
• 关键词: Kinetic; Simulations; Electron; Instabilities; Solar

Type III and IV solar radio bursts are highly energetic radio emissions from the solar corona, which appear in conjunction with solar flares and energetic particle emission. Due to their direct connection with coronal electron physics, they could serve as excellent probes of coronal physics and space weather prediction.However, due to the complex structure of the plasma in the solar corona, and the nonlinear plasma effects in this region, many details of the emission processes are impervious to analytic modelling. Kinetic simulations of the emission regions are hence required to study the details of electron instabilities leading to radio burst emission.Using the Particle-in-Cell code ACRONYM, which has already been successfully employed in the study of Type II radio bursts from coronal mass ejections, I plan to conduct simulations of particle acceleration, wave excitation and nonlinear coupling in the corona, focussing on the precise conditions leading to Type III and structured Type IV radio burst emission.

III型和IV型太阳射电暴是来自太阳日冕的高能量射电发射，与太阳耀斑和高能粒子发射一起出现。由于它们与日冕电子物理的直接联系，可以作为日冕物理和空间天气预报的优良探测器。然而，由于日冕中等离子体的复杂结构，以及该区域的非线性等离子体效应，许多发射过程的细节无法通过解析模型进行分析。因此，需要对发射区域进行动力学模拟，以研究导致射电暴发射的电子不稳定性的细节。我计划利用已经成功应用于日冕物质抛射II型射电暴研究的cell -in- cell代码ACRONYM，对日冕中的粒子加速、波激发和非线性耦合进行模拟，重点研究导致III型和结构化IV型射电暴发射的精确条件。

项目成果

ULF foreshock under radial IMF: THEMIS observations and global kinetic simulation Vlasiator results compared

• DOI: 10.1002/2015ja021526
• 发表时间: 2015-04
• 期刊: Journal of Geophysical Research: Space Physics
• 作者: M. Palmroth;M. Archer;R. Vainio;H. Hietala;Y. Pfau‐Kempf;S. Hoilijoki;O. Hannuksela;U. Ganse;A. Sandroos;S. Alfthan;J. Eastwood

Mirror modes in the Earth's magnetosheath: Results from a global hybrid‐Vlasov simulation

• DOI: 10.1002/2015ja022026
• 发表时间: 2016-05
• 期刊: Journal of Geophysical Research: Space Physics
• 作者: S. Hoilijoki;M. Palmroth;B. Walsh;Y. Pfau‐Kempf;S. von Alfthan;U. Ganse;O. Hannuksela;R. Vainio