Measurement of coronal magnetic twists during loop emergence of NOAA 8069

Details Measurement of coronal magnetic twists during loop emergence of NOAA 8069 Measurement of coronal magnetic twists during loop emergence of NOAA 8069

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001soph..203..289p&link_type=abstract

Solar Physics, v. 203, Issue 2, p. 289-308 (2001).

Physics

11

Scientific paper

Emerging coronal loops were studied with extreme ultraviolet observations performed by SOHO/EIT on 5 and 6 August 1997 for NOAA 8069. Physical parameters (size and twist) were determined by a new stereoscopic method. The flux tubes were measured twisted when first observed by EIT. After emerging, they de-twisted as they expanded, which corresponds to a minimization of the energy. Different scenarios which take into account the conservation of the magnetic helicity are discussed in relation with structure and temperature variations.

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