The Coronal Global Evolutionary Model: Using HMI Vector Magnetogram and Doppler Data to Determine Coronal Magnetic Field Evolution
The Coronal Global Evolutionary Model: Using HMI Vector Magnetogram and Doppler Data to Determine Coronal Magnetic Field Evolution
复制标题
DOI：
10.3847/1538-4365/abb3fb
复制
发表时间：
2020-06
期刊：
影响因子：
--
通讯作者：
J. Hoeksema;W. Abbett;D. Bercik;M. Cheung;M. DeRosa;G. Fisher;K. Hayashi;M. Kazachenko;
中科院分区：
文献类型：
--
作者：
J. Hoeksema;W. Abbett;D. Bercik;M. Cheung;M. DeRosa;G. Fisher;K. Hayashi;M. Kazachenko;
日冕全球演化模型(CGEM)提供了日冕磁场的数据驱动模拟，以更好地理解导致喷发事件的磁能积累。CGEM项目开发了六项能力。CGEM模块(1)准备全盘矢量磁场观测的时间序列，以(2)推导出活动区尺度上太阳光球层中变化的电场。这个局部电场被合并到一个表面通量传输模型中，该模型重建了以一致方式演化磁通量的全球电场。这些电场驱动一个(4)3D球面磁铁(SMF)模型，或者在有限的固体角度范围内以高分辨率，或者在全球范围内以较低的分辨率来确定低电晕中的磁场和电流密度。利用SMF在活动区上方产生的初始场和光球处演变的电场来驱动(5)对低日冕活动区进行详细的磁流体动力学(MHD)模拟。然后使用SMF或MHD解决方案来计算发射率代理，这些代理可以与日冕观测进行比较。最后，使用较低分辨率的SMF磁场来初始化(6)由SMF电场时间序列驱动的全球MHD模型，以模拟外日冕和日光层，最终将太阳与地球连接起来。作为演示，本报告介绍了CGEM在2011年2月对美国国家海洋和大气层管理局11158活动区演化的观测结果。
The Coronal Global Evolutionary Model (CGEM) provides data-driven simulations of the magnetic field in the solar corona to better understand the build-up of magnetic energy that leads to eruptive events. The CGEM project has developed six capabilities. CGEM modules (1) prepare time series of full-disk vector magnetic field observations to (2) derive the changing electric field in the solar photosphere over active-region scales. This local electric field is (3) incorporated into a surface flux transport model that reconstructs a global electric field that evolves magnetic flux in a consistent way. These electric fields drive a (4) 3D spherical magnetofrictional (SMF) model, either at high resolution over a restricted range of solid angles or at lower resolution over a global domain to determine the magnetic field and current density in the low corona. An SMF-generated initial field above an active region and the evolving electric field at the photosphere are used to drive (5) detailed magnetohydrodynamic (MHD) simulations of active regions in the low corona. SMF or MHD solutions are then used to compute emissivity proxies that can be compared with coronal observations. Finally, a lower-resolution SMF magnetic field is used to initialize (6) a global MHD model that is driven by an SMF electric field time series to simulate the outer corona and heliosphere, ultimately connecting Sun to Earth. As a demonstration, this report features results of CGEM applied to observations of the evolution of NOAA Active Region 11158 in 2011 February.