Glossary term: 磁场
Description: 电流会在周围产生一个称为磁场的影响区。反过来，带电粒子在磁场中运动时，也会受到力的作用，除非运动方向与磁场平行。
在天文学中，许多情况下物质会发生电离，其原子会分裂成带电粒子（以氢原子为例，会分为质子和电子）。由此产生的等离子体会产生磁场，并与磁场相互作用。
在恒星内部，运动的等离子体流通过发电机效应产生磁场。在恒星表面附近，磁场会导致恒星活动，例如黑子或耀发。恒星的磁场会在恒星表面产生黑子或耀发，被称为恒星风的带电粒子流会沿着磁力线向外运动。以太阳为例，构成太阳风的一些带电粒子会到达地球，在地球磁场的作用下偏向地球的南北两极。这些粒子使地球大气层发光，产生极光。
磁场在其他各种天体物理环境中也发挥着重要作用，从中子星或黑洞附近的超强磁场，到影响星系气体和等离子体大尺度运动的星际磁场，不一而足。
Related Terms:
See this term in other languages
Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher The translation of this term and its definition is still awaiting approval
The OAE Multilingual Glossary is a project of the IAU Office of Astronomy for Education (OAE) in collaboration with the IAU Office of Astronomy Outreach (OAO). The terms and definitions were chosen, written and reviewed by a collective effort from the OAE, the OAE Centers and Nodes, the OAE National Astronomy Education Coordinators (NAECs) and other volunteers. You can find a full list of credits here. All glossary terms and their definitions are released under a Creative Commons CC BY-4.0 license and should be credited to "IAU OAE".
