Helmet Streamers with Triple Structures: Weakly Two-Dimensional Stationary States

T Wiegelmann, K Schindler, Thomas Neukirch

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

Recent observations of the solar corona with the LASCO coronagraph on board the SOHO spacecraft have revealed the occurrence of triple helmet streamers even during solar minimum, which occasionally go unstable and give rise to particularly huge coronal mass ejections. We present a method to calculate (semi-)analytically self-consistent stationary configurations of triple helmet streamers which can serve as input for stability considerations and dynamical calculations. The method is based on an asymptotic expansion procedure using the elongated structure of the streamers. The method is very flexible and can be used in both Cartesian and spherical geometry. We discuss the effects of magnetic shear, gravity and field-aligned flow on open field lines. Example solutions illustrating the influence of each of these features on the solution structure are presented.

Original languageEnglish
Pages (from-to)p.439-460.
Number of pages22
JournalSolar Physics
Volume180
Issue number1/2
Publication statusPublished - Jun 1998

Keywords

  • SOLAR ERUPTIVE PROCESSES
  • CONDUCTIVE MAGNETOHYDRODYNAMIC FLOWS
  • FIELD-ALIGNED FLOW
  • CORONAL STRUCTURES
  • ONSET CONDITIONS
  • CURRENT SHEETS
  • MAGNETOTAIL
  • EQUILIBRIA
  • MODEL
  • SYSTEM

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