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.
→ bald, such called because of visual reference to a haircut (Titov et al. 1993, A&A 276, 564); → patch.