Whitney gathers in the solar atmosphere

Details Whitney gathers in the solar atmosphere Whitney gathers in the solar atmosphere

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006arep...50..422m&link_type=abstract

Astronomy Reports, vol. 50, Issue 5, p.422-426

Astronomy and Astrophysics

Astronomy

Pacs Numbers 96.60.P

Scientific paper

The structures called Whitney gathers in the catastrophe theory are not unusual among the various types of chromospheric Hα filaments and coronal helmets. They result from a projection of smooth surfaces onto a plane of the sky. The apices of the helmets can be described as gathers of the surface B r = 0 in the corona (where B r is the magnetic field). Near the limb, Hα filaments are frequently observed as similar types of structures. A model of the B r = 0 surface with sources located inside the Sun (∫ Bds = 0) is constructed here in this context. Gathers and folds of this surface are shown to be possible in relatively simple fields. Our model computations are supported by the available observational data.

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