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Colloquium

Small Transient Flux Ropes in the Solar Wind

2021-11-22
  • Speaker : 이대영 (충북대) / Dae-Young Lee (CBNU)
  • Date : 2021-12-01 10:30 ~ 11:30
  • Location : 온라인 진행 (Online)
  • Host : Yukinaga Miyashita

Satellite observations in the solar wind (1 au, closer to the Sun (~0.3 au) and farther (~5 au)) indicate persistent existence of well-organized small-scale transient magnetic structure in a form of twisted magnetic field lines and nested flux surfaces often referred to as flux rope. This is similar to but distinguished from typical (much larger scale) magnetic clouds in the sense that the spatial or temporal scale is much smaller or shorter and its occurrence rate is far higher. Its intrinsic nature in various aspects is currently a subject of intense research. In particular, unlike the normal magnetic clouds which are ejected from the solar corona, the origin of the small-scale flux ropes has not yet been unambiguously identified. Suggestions exist that they come from small solar eruptions (ejections) or are created by magnetic reconnection in the heliospheric current sheet or turbulence in the solar wind. Frequent occurrence of this well-organized magnetic structure is a promising feature for promoting space weather prediction capability. In this talk, I will review the current understanding and major issues of this intriguing small transient flux ropes identified from various satellite observations.