Sunspot Formation from Emerging Flux Ropes - Observations from Flare Genesis

Details Sunspot Formation from Emerging Flux Ropes - Observations from Flare Genesis Sunspot Formation from Emerging Flux Ropes - Observations from Flare Genesis

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sp42a09r&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SP42A-09

Physics

7519 Flares, 7524 Magnetic Fields, 7529 Photosphere

Scientific paper

From January 10 to 27, 2000, the Flare Genesis payload observed the Sun while suspended from a balloon in the stratosphere above Antarctica. The goal of the mission was to acquire a long time series of high-resolution images and vector magnetograms of the solar photosphere and chromosphere. We obtained images, magnetograms and Dopplergrams in the magnetically sensitive Ca I line at 6122 Angstroms. Additional simultaneous images were obtained in the wing of H-alpha. On January 25, 2000, we observed in NOAA region 8844 at N05 W30. The rapid development of a sunspot group that apparently included a delta spot (two polarities within one umbra). We considered a variety of models for interpreting these observations, including a twisted flux tube, a bipole that annihilates, a bipole that submerges, and a field distorted by mass loading. From the vector magnetograms and Doppler measurements, we conclude that nearly horizontal flux ropes are swept into the developing spot where they tilt upward to contribute to the familiar nearly vertical sunspot fields. The largest flux rope exhibited a twisted structure, and its angle with respect to the vertical was so great that it could be mistaken for a positive magnetic field merging into a negative sunspot. Flare Genesis was supported by NASA grant NAG5-8331 and by NSF grant OPP-9909167.

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