MULTIWAVELENGTH OBSERVATIONS of A SLOW-RISE, MULTISTEP X1.6 FLARE and the ASSOCIATED ERUPTION

Vasyl Yurchyshyn, P. Kumar, K. S. Cho, E. K. Lim, V. I. Abramenko

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Using multiwavelength observations, we studied a slow-rise, multistep X1.6 flare that began on 2014 November 7 as a localized eruption of core fields inside a δ-sunspot and later engulfed the entire active region (AR). This flare event was associated with formation of two systems of post-eruption arcades (PEAs) and several J-shaped flare ribbons showing extremely fine details, irreversible changes in the photospheric magnetic fields, and it was accompanied by a fast and wide coronal mass ejection. Data from the Solar Dynamics Observatory and IRIS spacecraft, along with the ground-based data from the New Solar Telescope, present evidence that (i) the flare and the eruption were directly triggered by a flux emergence that occurred inside a δ-sunspot at the boundary between two umbrae; (ii) this event represented an example of the formation of an unstable flux rope observed only in hot AIA channels (131 and 94 Å) and LASCO C2 coronagraph images; (iii) the global PEA spanned the entire AR and was due to global-scale reconnection occurring at heights of about one solar radius, indicating the global spatial and temporal scale of the eruption.

Original languageEnglish (US)
Article number172
JournalAstrophysical Journal
Volume812
Issue number2
DOIs
StatePublished - Oct 20 2015

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Sun: chromosphere
  • Sun: coronal mass ejections (CMEs)
  • Sun: flares
  • Sun: magnetic fields
  • Sun: photosphere
  • sunspots

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