Solar Physics

, Volume 157, Issue 1–2, pp 325–348 | Cite as

Dynamical evolution of a coronal streamer-bubble system

I.A self-consistent planar magnetohydrodynamic simulation
  • S. T. Wu
  • W. P. Guo
  • J. F. Wang


We present a self-consistent, time-dependent magnetohydrodynamic (MHD) description of a dipolar configuration helmet streamer in which a magnetic bubble structure has been introduced into the closed field region of the helmet streamer. A numerical model is used to study the magnetohydrodynamic evolution of this streamer-bubble system. We find two distinct behaviors characterized by the size of the magnetic bubble: (i) if the bubble's radius is less than or equal to 0.15R c (whereRc is the characteristic length of the helmet streamer), the numerical solution describes a quasi-equilibrium state, and this coronal streamer-bubble structure is stable; and (ii) if the bubble's radius is equal to or larger than 0.25R c the numerical solution describes a non-equilibrium state and, after a period of slow evolution, this coronal streamer bubble structure becomes unstable and breaks up dynamically. In the case of the dipolar configuration helmet streamer,R c is the solar radius. We identify the non-equilibrium solution as a loss of equilibrium of this coronal magnetic structure. Its subsequent dynamic development may be a candidate for some of the commonly observed coronal mass ejections (CMEs).


Characteristic Length Magnetic Structure Coronal Mass Ejection Dynamic Development Field Region 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Kluwer Academic Publishers 1995

Authors and Affiliations

  • S. T. Wu
    • 1
  • W. P. Guo
    • 1
  • J. F. Wang
    • 2
  1. 1.Center for Space Plasma andAeronomic Research, Department of Mechanical and Aerospace EngineeringThe University of Alabama in HuntsvilleHuntsvilleUSA
  2. 2.Department of Space PhysicsW-Han UniversityWu-Han, HubeiPeople's Republic of China

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