Emergence of a Helical Flux Rope under an Active Region Prominence

By T. Okamoto, S. Tsuneta, B. Lites, M. Kubo, T. Yokoyama, T. Berger, K. Ichimoto, Y. Katsukawa, S. Nagata, Kazunari Shibata and 5 more. 2008

148 citations recorded by the source corpus.

Continuous observations were obtained of NOAA AR 10953 with the Solar Optical Telescope (SOT) on board the Hinode satellite from 2007 April 28 to May 9. A prominence was located over the polarity inversion line (PIL) to the southeast of the main sunspot. These observations provided us with a time series of vector magnetic fields on the photosphere under the prominence. We found four features: (1) The abutting opposite-polarity regions on the two sides along the PIL first grew laterally in size and then narrowed. (2) These abutting regions contained vertically weak but horizontally strong magnetic fields. (3) The orientations of the horizontal magnetic fields along the PIL on the photosphere gradually changed with time from a normal-polarity configuration to an inverse-polarity one. (4) The horizontal magnetic field region was blueshifted. These indicate that helical flux rope was emerging from below the photosphere into the corona along the PIL under the preexisting prominence. We suggest that this supply of a helical magnetic flux to the corona is associated with evolution and maintenance of active region prominences.

Subfields: Astronomy and Astrophysics, Statistical and Nonlinear Physics

View Paper: https://www.semanticscholar.org/paper/ef0df83b80bbf4d1077b9d49cbb341d5b7c85408

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In Astronomy and Astrophysics

In Statistical and Nonlinear Physics

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Citations in the corpus

Driving major solar flares and eruptions: A review (2008, background): “…is often associated with flaring activity (examples are a statistical study by, e.g., Cui et al. 2007, and individual event studies by Kurokawa et al. 2002, Brooks et al. 2003, Dun et al. 2007, Schrijver et al. 2008, Okamoto et al. 2008, and Lites 2008; also coronal field studies described in Sect.”
A CRITICAL ASSESSMENT OF NONLINEAR FORCE-FREE FIELD MODELING OF THE SOLAR CORONA FOR ACTIVE REGION 10953 (2009, background): “2), a feature which was anticipated by the analysis of Okamoto et al. (2008).”
Solar filament eruptions and their physical role in triggering Coronal Mass Ejections (2012, background): “Recent observations made with Hinode/SP (spectropolarimeter) based on the temporal rotation of magnetic vectors along an inversion line in an AR have been interpreted as the signature of a flux rope crossing the photosphere (Okamoto et al., 2008).”
COEXISTING FLUX ROPE AND DIPPED ARCADE SECTIONS ALONG ONE SOLAR FILAMENT (2010, background): “Magnetic dips have been inferred from vector magnetic field observations in the photosphere (Lites 2005; López Ariste et al. 2006; Okamoto et al. 2008).”
Physics of Solar Prominences: II—Magnetic Structure and Dynamics (2010, background): “54 A more recent example of the effect of evolving magnetic fields on the structure and stability of an active region filament is described by Okamoto et al. (2008) and Okamoto et al. (2009).”