Abstract
Spectropolarimetric observations combined with tomographic imaging techniques
have revealed that all pre-main sequence (PMS) stars host multipolar magnetic
fields, ranging from strong and globally axisymmetric with \~>kilo-Gauss dipole
components, to complex and non-axisymmetric with weak dipole components (<\~0.1
kG). Many host dominantly octupolar large-scale fields. We argue that the
large-scale magnetic properties of a PMS star are related to its location in
the Hertzsprung-Russell diagram. This conference paper is a synopsis of Gregory
et al. (2012), updated to include the latest results from magnetic mapping
studies of PMS stars.
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