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In the course of the Hamburg/ESO survey we have discovered a white dwarfwhose spectrum exhibits many similarities with the prototype of magnetic whitedwarfs Grw+70$^{\circ}$8247. In particular several stationary line componentsindicative for magnetic fields between about 150 and 400 MG are found in bothobjects. However, the features between 5000 and 5500 \AA in the spectrum ofHE0241-0155 cannot be explained by stationary line components and demand arelatively homogeneous magnetic field with clustering around 200 MG. For thisreason a pure dipole model failed to reproduce this spectral region.Anoffset-dipole configuration led to some improvement in the fit but a goodagreement was only possible for a geometry -- described by an expansion intospherical harmonics -- where most of the surface is covered with magnetic fieldstrengths strongly clustered around 200 MG. This may indicate the presence of alarge magnetic spot whose presence could be tested with time resolvedspectro-polarimetry.Comment: 4 pages, 3 figures. accepted for publication by Astronomy and  Astrophysic

HE0241-0155 – Evidence for a large scale homogeneous field in a highly magnetic white dwarf