Photospheric Magnetic Free Energy Density of Solar Active Regions

详细信息    查看全文

• 作者：Hongqi Zhang
• 关键词：Sun ; activity ; Sun ; magnetic topology ; Sun ; photosphere ; Sun ; flare ; CMEs
• 刊名：Solar Physics
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：291
• 期：12
• 页码：3501-3517
• 全文大小：
• 刊物类别：Physics and Astronomy
• 刊物主题：Astrophysics and Astroparticles; Atmospheric Sciences; Space Sciences (including Extraterrestrial Physics, Space Exploration and Astronautics);
• 出版者：Springer Netherlands
• ISSN：1573-093X
• 卷排序：291

文摘

We present the photospheric energy density of magnetic fields in two solar active regions (one of them recurrent) inferred from observational vector magnetograms, and compare it with other available differently defined energy parameters of magnetic fields in the photosphere. We analyze the magnetic fields in Active Regions NOAA 6580-6619-6659 and 11158. The quantity \(\frac{1}{4\pi}{\mathbf{B}}_{n}\cdot{\mathbf{B}}_{p}\) is an important energy parameter that reflects the contribution of magnetic shear to the difference between the potential (\(\mathbf{B}_{p}\)) and the non-potential magnetic field (\(\mathbf{B}_{n}\)), and also the contribution to the free magnetic energy near the magnetic neutral lines in the active regions. It is found that the photospheric mean magnetic energy density shows clear changes before the powerful solar flares in Active Region NOAA 11158, which is consistent with the change in magnetic fields in the flaring lower atmosphere.