Conditions for Transition from Quiescent to Active States in Stellar Atmospheres

  • Wolfgang Zwingmann
Conference paper
Part of the Astrophysics and Space Science Library book series (ASSL, volume 143)


It is widely believed that activity in solar and stellar atmospheres is correlated to the presence of magnetic fields. Flares may be understood as large scale instabilities of magnetic field structures due to changes in photospheric boundary conditions, releasing previously stored energy. This picture has motivated us to place the emphasis on the preflare state rather than on the details of the later development. Bifurcation theory, stability analysis and numerical simulation are appropriate tools to investigate the preflare state. Care must be taken regarding the choice of boundary conditions because they may sensitively influence the results. Several approaches using these tools are discussed including a discussion of an analogous process in magnetospheric substorms. It is shown that the deviation from the force-free case seems to be relevant for the onset and the release of the stored energy. A variety of particular physical effects such as the formation of thin current sheets arise if magnetic reconnection occurrs.


Current Sheet Solar Phys Stellar Atmosphere Equilibrium Sequence Thin Current Sheet 
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 1988

Authors and Affiliations

  • Wolfgang Zwingmann
    • 1
  1. 1.Institut für Theoretische Physik IVRuhr-Universität BochumBochum 1Germany

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