当前位置: X-MOL 学术Res. Astron. Astrophys. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Modeling the 2017 September 10 solar energetic particle event using the iPATH model
Research in Astronomy and Astrophysics ( IF 1.8 ) Pub Date : 2020-09-01 , DOI: 10.1088/1674-4527/20/9/145
Zhe-Yi Ding 1, 2 , Gang Li 2 , Jun-Xiang Hu 2 , Shuai Fu 2, 3
Affiliation  

On September 10 2017, a fast coronal mass ejection (CME) erupted from the active region (AR) 12673, leading to a ground level enhancement (GLE) event at Earth. Using the 2D improved Particle Acceleration and Transport in the Heliosphere (iPATH) model, we model the large solar energetic particle (SEP) event of 10 September 2017 observed at Earth, Mars and STEREO-A. Based on observational evidence,we assume that the CME-driven shock experienced a large lateral expansion shortly after the eruption, which is modelled by a double Gaussian velocity profile in this simulation. We use the in-situ shock arrival times and the observed CME speeds at multiple spacecraft near Earth and Mars as constraints to adjust the input model parameters. The modelled time intensity profiles and fluence for energetic protons are then compared with observations. Reasonable agreements with observations at Mars and STEREO-A are found. The simulated results at Earth differ from observations of GOES-15. Instead, the simulated results at a heliocentric longitude 20 degree west to Earth fit reasonably well with the GOES observation. This can be explained if the pre-event solar wind magnetic field at Earth is not described by a nominal Parker field. Our results suggest that a large lateral expansion of the CME-driven shock and a distorted interplanetary magnetic field due to previous events can be important in understanding this GLE event.

中文翻译:

使用 iPATH 模型对 2017 年 9 月 10 日的太阳高能粒子事件进行建模

2017 年 9 月 10 日,活动区 (AR) 12673 爆发了快速日冕物质抛射 (CME),导致地球发生地面增强 (GLE) 事件。使用改进的 2D 日光层粒子加速和传输 (iPATH) 模型,我们模拟了 2017 年 9 月 10 日在地球、火星和 STEREO-A 上观测到的大型太阳高能粒子 (SEP) 事件。根据观测证据,我们假设 CME 驱动的激波在喷发后不久经历了大的横向扩展,在本模拟中通过双高斯速度剖面进行建模。我们使用原位冲击到达时间和在地球和火星附近多个航天器上观测到的 CME 速度作为约束来调整输入模型参数。然后将模拟的时间强度分布和高能质子的注量与观察结果进行比较。发现了与火星和 STEREO-A 观测的合理一致。地球上的模拟结果与 GOES-15 的观测结果不同。相反,在地球以西 20 度的日心经度处的模拟结果与 GOES 观测结果相当吻合。如果地球上的事件前太阳风磁场不是由标称帕克场描述的,这可以解释。我们的结果表明,CME 驱动的激波的大横向扩展和由于先前事件导致的行星际磁场扭曲对于理解这次 GLE 事件很重要。如果地球上的事件前太阳风磁场不是由标称帕克场描述的,这可以解释。我们的结果表明,CME 驱动的激波的大横向扩展和由于先前事件导致的行星际磁场扭曲对于理解这次 GLE 事件很重要。如果地球上的事件前太阳风磁场不是由标称帕克场描述的,这可以解释。我们的结果表明,CME 驱动的激波的大横向扩展和由于先前事件导致的行星际磁场扭曲对于理解这次 GLE 事件很重要。
更新日期:2020-09-01
down
wechat
bug