پچ ِ تاس، تکهی ِ ~
pac-e tâs, tekke-ye ~
Fr.: zone chauve
The location on the surface of the → Sun
where → coronal
→ magnetic field lines become
tangent to the → photosphere. Bald patches play an
important role in solar → magnetohydrodynamics.
such called because of visual reference to a haircut (Titov et al. 1993,
A&A 276, 564); → patch.