Studies of energization of magnetospheric particles by substorm dipolarizations

亚暴偶极化对磁层粒子供能的研究

• 批准号: RGPIN-2018-03988
• 负责人: Kabin, Konstantin
• 金额: $ 2.04万
• 依托单位: Royal Military College of Canada
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=712655
• 关键词: Studies; energization; magnetospheric; particles; substorm

The goal of the proposed research is to model the fluxes of energetic particles (mostly electrons and protons) generated during substorm events. Enhanced fluxes of these particles are often observed by satellites at geostationary orbit in association with substorm dipolarizations. These particles often possess energies of hundreds of keVs and are capable of damaging satellite electronics resulting in significant economic losses for the industry. Despite many years of active research many questions regarding the energization process remain unanswered. We consider two scenarios of substrom dipolarizations: the tailward propagating edge of the transition from dipole to stretched magnetic field lines and earthward propagating electromagnetic pulse. Both scenarios lead to significant energization of the tail populations of electrons and protons and both have observational support. The first scenario is well supported by the ground-based observations, such as photometer observations of auroras and riometer observations of the ionospheric transmissivity, the second by in-situ satellite observations. Our modeling efforts will help to improve our understanding of the energization process of the charged particles and quantify their effects in the magnetosphere and ionosphere. Ultimately, we hope to be able to quantify the manifestations of the two energization scenarios both in space and in the ionosphere. This will allow us to distinguish the two and to reconcile the apparent disagreement between the ground-based and satellite observations.

拟议研究的目标是模拟亚暴事件期间产生的高能粒子（主要是电子和质子）的通量。地球静止轨道上的卫星经常观察到这些粒子通量的增强与亚暴极化有关。这些粒子通常具有数百keV的能量，能够损坏卫星电子设备，从而给行业造成重大经济损失。尽管进行了多年的积极研究，但有关通电过程的许多问题仍未得到解答。我们考虑亚斯特罗姆偶极化的两种情况：从偶极子到拉伸磁场线过渡的尾部传播边缘和向地球传播的电磁脉冲。这两种情况都会导致电子和质子尾部群体的显着激发，并且都有观测支持。第一种情况得到了地面观测的充分支持，例如极光的光度计观测和电离层透射率的光度计观测，第二种情况得到了现场卫星观测的充分支持。我们的建模工作将有助于提高我们对带电粒子的赋能过程的理解，并量化它们在磁层和电离层中的影响。最终，我们希望能够量化太空和电离层中两种激励场景的表现。这将使我们能够区分两者并调和地面观测和卫星观测之间的明显分歧。