1996
DOI: 10.1086/310118
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Evidence for Helically Kinked Magnetic Flux Ropes in Solar Eruptions

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Cited by 530 publications
(369 citation statements)
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“…This segregation of helicity signs is consistent with other evidence that the northern hemisphere exhibits primarily small scale left handed twist and larger scale right handed writhe, with these reversed in southern hemisphere (Rust and Kumar 1996;Pevtsov et al 2008, Zhang et al 2010Hau & Zhang 2011). These features seem to be invariant with respect to solar cycle, as would be predicted by helical dynamos, even when the field itself reverses sign.…”
Section: Helicity Fluxes In Galactic and Stellar Contextssupporting
confidence: 90%
“…This segregation of helicity signs is consistent with other evidence that the northern hemisphere exhibits primarily small scale left handed twist and larger scale right handed writhe, with these reversed in southern hemisphere (Rust and Kumar 1996;Pevtsov et al 2008, Zhang et al 2010Hau & Zhang 2011). These features seem to be invariant with respect to solar cycle, as would be predicted by helical dynamos, even when the field itself reverses sign.…”
Section: Helicity Fluxes In Galactic and Stellar Contextssupporting
confidence: 90%
“…(1) Such major energy release events, which we will refer to collectively as flares in the following, often show a distinctive soft X-ray (SXR) brightening of sigmoidal (S or reverse-S) shape shortly prior or during their early, impulsive stages of development (e.g., Rust & Kumar 1996;Manoharan et al 1996;Pevtsov et al 1996;Aurass et al 1999;Moore et al 2001;Gibson et al 2002). The sigmoidal shape is generally regarded as a signature of coronal currents in a twisted field and shows a hemispheric preference: forward (reverse) S shapes dominate in the southern (northern) hemisphere (Rust & Kumar 1996).…”
Section: Introductionmentioning
confidence: 99%
“…The sigmoidal shape is generally regarded as a signature of coronal currents in a twisted field and shows a hemispheric preference: forward (reverse) S shapes dominate in the southern (northern) hemisphere (Rust & Kumar 1996). Typically the central part of such transient sigmoids…”
Section: Introductionmentioning
confidence: 99%
“…Prior to the eruption, an S-shaped structure, called a sigmoid by Rust and Kumar [1996], often develops in associa tion with a filament activation. The sigmoid structure, one of the most important discoveries in the Yohkoh spacecraft observations, denotes the dominant helicity in a given hemisphere, being S-shaped or right-handed in the south and reverse-S or left-handed in the north.…”
Section: The Source Regions Of Cmesmentioning
confidence: 99%