磁对消引起的日珥扰动  

Disturbance of Prominence Caused by Magnetic Cancellation

作　　者：刘伟[1] 胡友秋[1] 夏利东[1] 杨玉林[1] 

机构地区：[1]中国科学技术大学地球和空间科学系,合肥230026

出　　处：《天体物理学报》2000年第2期171-178,共8页

基　　金：国家自然科学基金!19791090

摘　　要：采用二维三分量理想磁流体力学模型，研究光球磁对消引起的日珥扰动．日珥下方光球表面的磁对消将磁通量向日珥传输，引起日珥内部磁通量和磁螺度增加．日珥的状态与所积累的磁通量（或磁螺度）有关．数值结果显示，如果日珥磁通的相对增量δＦ（或相应的磁螺度相对增量δＨ）较小，日珥只略微上升和膨胀，并不离开光球；而对于较大的δＦ或δＨ）；日珥将脱离光球，悬浮在低层日冕中，在其下方形成垂直电流片．Using a two-dimensional, three-component magnetohydrodynamic model, a numerical study is presented on the disturbance of prominence caused by photospheric magnetic cancellation. Photospheric magnetic cancellation below the prominence transports magnetic flux into the prominence, resulting in an increase of both magnetic flux and helicity in the prominence. The state of the prominence is related to its accumulated magnetic flux (or magnetic helicity). As shown in the numerical results, when F (the relative increment of magnetic flux in the prominence) or H (the corresponding relative increment of magnetic helicity) is small, the prominence rises and expands only slightly, and remains in contact with the photosphere. On the other hand, when F or H is large, the prominence is detached from the photosphere and eventually is suspended in the lower corona, leading to the formation of a vertical current sheet below the prominence.

关 键 词：太阳磁场 日珥 磁对消 磁螺度 

分 类 号：P182.61[天文地球—天文学]