Solar Energetic Particle Modelling for Space Weather

空间天气的太阳能高能粒子建模

• 批准号: ST/H002944/1
• 负责人: Silvia Dalla
• 金额: $ 34.95万
• 依托单位: University of Central Lancashire
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2010
• 资助国家: 英国
• 起止时间: 2010 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=ST%2FH002944%2F1
• 关键词: Solar; Energetic; Particle; Modelling; Space

High energy solar particles accelerated at the Sun during flares and Coronal Mass Ejections (CME) pose a threat to humans and satellite equipment in space. This project will develop new models of the acceleration and propagation through space of these Solar Energetic Particles (SEPs). Up to now, the majority of simulations aimed at predicting the intensity of SEPs following a solar event have assumed that the particles tend to remain 'tied' to the magnetic field, moving parallel to it. However, recent data from the Ulysses spacecraft and other missions have shown that particles can efficiently jump across magnetic field lines. This phenomenon, called cross-field diffusion, is likely to have a strong effect on our predictions of how many particles will reach a given location in space following a flare or CME. In this project we will include cross-field diffusion in a code that describes SEP acceleration and propagation. We will run our code on a supercomputer, to minimise its running time, and will compare the results obtained using different models of cross-field diffusion with data from the twinned STEREO spacecraft, to choose the model that best describes the data. Our work will be applied to predicting the hazard to astronauts from SEPs, as part of studies of so-called Space Weather.

高能太阳粒子在耀斑和日冕物质抛射 (CME) 期间在太阳处加速，对太空中的人类和卫星设备构成威胁。该项目将开发这些太阳能高能粒子（SEP）在太空中加速和传播的新模型。到目前为止，大多数旨在预测太阳事件后SEP强度的模拟都假设粒子往往保持与磁场“束缚”，并与其平行移动。然而，尤利西斯号航天器和其他任务的最新数据表明，粒子可以有效地跨越磁场线。这种称为跨场扩散的现象可能会对我们预测有多少粒子在耀斑或日冕物质抛射后到达太空中的给定位置产生重大影响。在这个项目中，我们将在描述 SEP 加速和传播的代码中包含跨场扩散。我们将在超级计算机上运行我们的代码，以最大限度地减少其运行时间，并将使用不同的跨场扩散模型获得的结果与来自孪生 STEREO 航天器的数据进行比较，以选择最能描述数据的模型。我们的工作将用于预测 SEP 对宇航员造成的危险，作为所谓太空天气研究的一部分。

项目成果

CROSS-FIELD TRANSPORT OF SOLAR ENERGETIC PARTICLES IN A LARGE-SCALE FLUCTUATING MAGNETIC FIELD

• DOI: 10.1088/0004-637x/750/1/47
• 发表时间: 2012-02
• 期刊: The Astrophysical Journal
• 作者: J. Kelly;Silvia Dalla;Timo Laitinen

Test-particle simulations of SEP propagation in IMF with large-scale fluctuations

大规模波动的 IMF 中 SEP 传播的测试粒子模拟

• DOI: 10.1063/1.4768752
• 发表时间: 2012
• 作者: Kelly J

ENERGETIC PARTICLE DIFFUSION IN STRUCTURED TURBULENCE

• DOI: 10.1088/0004-637x/749/2/103
• 发表时间: 2012-02
• 期刊: The Astrophysical Journal
• 作者: T. Laitinen;S. Dalla;J. Kelly

Heavy-ion acceleration and self-generated waves in coronal shocks

• DOI: 10.1051/0004-6361/201117507
• 发表时间: 2011-11
• 期刊: Astronomy and Astrophysics
• 影响因子: 6.5
• 作者: M. Battarbee;T. Laitinen;R. Vainio