首次对极光质子降水进行三维混合Vlasov全球模拟并与卫星观测结果进行比较

IF 3.4 2区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS
M. Grandin, Thijs Luttikhuis, M. Battarbee, G. Cozzani, Hongyang Zhou, L. Turc, Y. Pfau‐Kempf, H. George, K. Horaites, E. Gordeev, U. Ganse, Konstantinos E. Papadakis, M. Alho, F. Tesema, J. Suni, M. Dubart, V. Tarvus, M. Palmroth
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引用次数: 2

摘要

带电粒子从磁层沉淀到电离层是这两个地球空间区域之间的关键耦合机制之一,并与多种空间天气影响有关,如全球导航卫星系统信号中断和地面地磁感应电流。尽管在过去几十年中,许多航天器任务都测量了降水粒子通量,但在亚暴期间,通常很难获得具有良好时间分辨率的全球降水模式。数值模拟有助于弥合这一差距,并通过其提供的近地空间系统的全球视图,提高对高纬度粒子降水机制的理解。我们在Vlasiator混合Vlasov模型的三维模拟中首次给出了极光(0.5–50 keV)质子沉淀的结果。这次运行是由具有恒定太阳风参数的向南行星际磁场条件驱动的。我们发现,在白天,尖点质子降水表现出预期的能量-纬度分散,并以连续爆发的形式发生,与通过白天磁层顶重联形成的通量转移事件的过境有关。在夜间,降水发生在地磁纬度的预期范围内,很明显,降水粒子注入发生在狭窄的磁局部时间跨度内,这与近地磁尾中的快速地球等离子体流有关。最后,将模拟的降水通量与国防气象卫星计划航天器在类似于模拟的驾驶条件下的观测结果进行了比较,发现与测量结果非常一致。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
First 3D hybrid-Vlasov global simulation of auroral proton precipitation and comparison with satellite observations
The precipitation of charged particles from the magnetosphere into the ionosphere is one of the crucial coupling mechanisms between these two regions of geospace and is associated with multiple space weather effects, such as global navigation satellite system signal disruption and geomagnetically induced currents at ground level. While precipitating particle fluxes have been measured by numerous spacecraft missions over the past decades, it often remains difficult to obtain global precipitation patterns with a good time resolution during a substorm. Numerical simulations can help to bridge this gap and improve the understanding of mechanisms leading to particle precipitation at high latitudes through the global view they offer on the near-Earth space system. We present the first results on auroral (0.5–50 keV) proton precipitation within a 3-dimensional simulation of the Vlasiator hybrid-Vlasov model. The run is driven by southward interplanetary magnetic field conditions with constant solar wind parameters. We find that, on the dayside, cusp proton precipitation exhibits the expected energy–latitude dispersion and takes place in the form of successive bursts associated with the transit of flux transfer events formed through dayside magnetopause reconnection. On the nightside, the precipitation takes place within the expected range of geomagnetic latitudes, and it appears clearly that the precipitating particle injection is taking place within a narrow magnetic local time span, associated with fast Earthward plasma flows in the near-Earth magnetotail. Finally, the simulated precipitating fluxes are compared to observations from Defense Meteorological Satellite Program spacecraft during driving conditions similar to those in the simulation and are found to be in good agreement with the measurements.
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来源期刊
Journal of Space Weather and Space Climate
Journal of Space Weather and Space Climate ASTRONOMY & ASTROPHYSICS-GEOCHEMISTRY & GEOPHYSICS
CiteScore
6.90
自引率
6.10%
发文量
40
审稿时长
8 weeks
期刊介绍: The Journal of Space Weather and Space Climate (SWSC) is an international multi-disciplinary and interdisciplinary peer-reviewed open access journal which publishes papers on all aspects of space weather and space climate from a broad range of scientific and technical fields including solar physics, space plasma physics, aeronomy, planetology, radio science, geophysics, biology, medicine, astronautics, aeronautics, electrical engineering, meteorology, climatology, mathematics, economy, informatics.
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