Practical Determination of Force-Free Coronal Magnetic Fields

无力日冕磁场的实际测定

• 批准号: 9108369
• 负责人: Zoran Mikic
• 金额: $ 13.5万
• 依托单位: SAI San Diego
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-05-01 至 1993-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9108369&HistoricalAwards=false
• 关键词: Practical; Determination; Force; Free; Coronal

The nature of the coronal magnetic field is of central importance to the understanding and prediction of solar flares. The coronal magnetic field, however, cannot be measured directly. It is proposed to develop and apply a new method for computing the force-free coronal field from the photospheric magnetic field, as measured by a vector magnetograph. The coronal field is obtained by solving the nonlinear force-free equation (with non-constant alpha). The proposed algorithm employs a novel formulation of the force-free problem in which the field is evolved from a potential field to a force-free field which satisfies the observed boundary data. The field is required to satisfy boundary conditions on the magnetic flux and the normal component of the electric current density at the boundary. It is planned to study the practical considerations involved in the application of the method to necessarily imperfect magnetograph data, using the Stokes Polarimeter and the Imaging Vector Magnetograph at Mees Solar Observatory, University of Hawaii.

日冕磁场的性质是中心的 对了解和预测太阳耀斑的重要性。 然而，日冕磁场无法直接测量。 提出了发展和应用一种新的计算方法 光球磁场的无力日冕场 磁场，由矢量磁仪测量。 日冕磁场 通过求解非线性无力方程（其中 非常数α）。该算法采用了一种新的 力的自由问题的公式化，其中场是 从势场演化为无力场， 满足观测边界数据。 该字段必须 满足边界条件的磁通量和正常的 在边界处的电流密度的分量。 是 计划研究其中涉及的实际考虑因素 该方法在不完全磁象仪中的应用 数据，使用斯托克斯偏振计和成像矢量 夏威夷大学米斯太阳天文台的磁力仪。