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EP: Fachverband Extraterrestrische Physik

EP 9: Poster

EP 9.9: Poster

Donnerstag, 21. März 2019, 16:30–19:00, Durchgangshalle

Flux rope formation by a confined solar flare preceding a coronal mass ejection — •Bernhard Kliem¹, Jeongwoo Lee², Rui Liu³, Stephen M. White⁴, Chang Liu⁵, and Satoshi Masuda⁶ — ¹Institute of Physics and Astronomy, University of Potsdam, Germany — ²Kyung Hee Univ., Yongin, Republic of Korea — ³USTC, Hefei, China — ⁴AFRL, Albuquerque, NM, USA — ⁵NJIT, Newark, NJ, USA — ⁶Nagoya University, Japan

Two categories of onset mechanism for solar eruptions (coronal mass ejections [CMEs], filament or prominence eruptions, and flares) are currently being debated. Ideal MHD mechanisms suggest the instability of a magnetic flux rope, thus, must assume that a flux rope exists at eruption onset. Reconnection mechanisms assume that a (not yet verified) mechanism of self-amplifying magnetic reconnection commences in a sheared magnetic arcade, triggering and driving the eruption and forming a flux rope as a result. Here we analyze an eruption event which strongly indicates that a magnetic flux rope was formed prior to a major CME by a preceding confined flare (i.e. a flare not associated with a CME). We also present evidence that such flux-rope-forming precursor flares often occur prior to CMEs, which lends support to the ideal MHD mechanism for solar eruptions.