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arXiv 2201.12049physics.space-phastro-ph.IMastro-ph.SRphysics.geo-ph
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基于阻力的CME传播模型的参数分布

Parameter Distributions for the Drag-Based Modeling of CME Propagation

Gianluca Napoletano, Raffaello Foldes, Enrico Camporeale, Giancarlo de Gasperis, Luca Giovannelli, Evangelos Paouris, Ermanno Pietropaolo, Jannis Teunissen, Aja… 展开作者

Gianluca Napoletano, Raffaello Foldes, Enrico Camporeale, Giancarlo de Gasperis, Luca Giovannelli, Evangelos Paouris, Ermanno Pietropaolo, Jannis Teunissen, Ajay Kumar Tiwari, Dario Del Moro

摘要:

近年来,集合模式在空间天气中被广泛应用,以估计预报中的不确定性。在这里,我们专注于集成建模的CME到达时间和到达速度使用基于拖动的模型,这是非常适合于此目的,由于其简单性和低计算成本。虽然集合技术以前已被应用到基于阻力的模式,它仍然不清楚如何最好地确定其输入参数,即阻力参数和太阳风速度的分布。这项工作的目的是评估这些模型参数的统计分布,从过去的日冕物质抛射-ICME事件列表开始。我们采用LASCO日冕观测测量初始CME的位置和速度,并在现场数据,将它们与到达日期和到达速度。对于每个事件,我们运行一个统计过程来反转模型方程,生成参数分布作为输出。我们的研究结果表明,在以前的作品中采用的分布是适当的选择,即使他们是基于有限的样本和启发式的考虑。另一方面,对现有方法的改进也是值得进一步研究的,如太阳风加速或减速对CME的阻力参数分布的影响。

英文摘要:

In recent years, ensemble modeling has been widely employed in space weather to estimate uncertainties in forecasts. We here focus on the ensemble modeling of CME arrival times and arrival velocities using a drag-based model, which is well-suited for this purpose due to its simplicity and low computational cost. Although ensemble techniques have previously been applied to the drag-based model, it is still not clear how to best determine distributions for its input parameters, namely the drag parameter and the solar wind speed. The aim of this work is to evaluate statistical distributions for these model parameters starting from a list of past CME-ICME events. We employ LASCO coronagraph observations to measure initial CME position and speed, and in situ data to associate them with an arrival date and arrival speed. For each event we ran a statistical procedure to invert the model equations, producing parameters distributions as output. Our results indicate that the distributions employed in previous works were appropriately selected, even though they were based on restricted samples and heuristic considerations. On the other hand, possible refinements to the current method are also identified, such as the dependence of the drag parameter distribution on the CME being accelerated or decelerated by the solar wind, which deserve further investigation.

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