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Longitudinal sound attenuation measurements in superfluid 3He in 98% aerogelwere conducted at pressures between 14 and 33 bar and in magnetic fields up to4.44 kG. The temperature dependence of the ultrasound attenuation in the A-likephase was determined for the entire superfluid region exploiting the fieldinduced meta-stable A-like phase at the highest field. In the lower field, theA-B transition in aerogel was identified by a smooth jump in attenuation onboth cooling and warming. Based on the transitions observed on warming, a phasediagram as a function of pressure (P), temperature (T) and magnetic field (B)is constructed. We find that the A-B phase boundary in aerogel recedes in adrastically different manner than in bulk in response to an increasing magneticfield. The implications of the observed phase diagram are discussed.

Ultrasound attenuation and a P-B-T phase diagram of superfluid 3He in 98% aerogel