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Performance-limiting magnetohydrodynamic (MHD) instabilities on ASDEX Upgrade are discussed. In the conventional H-mode scenario, the main MHD performance limitation is found to be the neoclassical tearing mode (NTM). The onset b of NTMs in ASDEX Upgrade scales with the poloidal ion gyroradius, in agreement with theoretical expectations. At higher b values, NTMs occur in a more benign form, the frequently-interruptedregime NTMs, which lead to a smaller confinement degradation than normal NTMs.doi:10.13182/fst03-a407 fatcat:tamhshpzzvdynkt7regwq6bvm4