Observational Evidence of the Kink Instability in Solar Filament Eruptions and Sigmoids

Details Observational Evidence of the Kink Instability in Solar Filament Eruptions and Sigmoids Observational Evidence of the Kink Instability in Solar Filament Eruptions and Sigmoids

Mar 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005apj...622l..69r&link_type=abstract

The Astrophysical Journal, Volume 622, Issue 1, pp. L69-L72.

Astronomy and Astrophysics

Astronomy

62

Magnetohydrodynamics: Mhd, Sun: Coronal Mass Ejections (Cmes), Sun: Filaments, Sun: Flares, Sun: Magnetic Fields

Scientific paper

Two lines of observational evidence are used to infer that the MHD helical kink instability is associated with solar eruptions. The senses of twist and writhe are determined in images of seven erupting filaments obtained at 10830, 1600, 195, and 171 Å. In every case the sense of twist is the same as the sense of writhe, as required for a kink. From images in the soft X-ray and EUV spectrum, measurements of the height/width ratio of 623 sigmoids show a mean value of 5.47, which is the ratio expected for kinked flux ropes.

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