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The CUTLASS Finland radar, which comprises anintegral part of the SuperDARN system of HF coherent radars, provides nearcontinuous observations of high-latitude plasma irregularities within afield-of-view which extends over some four million square kilometres. Within theFinland radar field-of-view lie both the EISCAT mainland and EISCAT Svalbardincoherent scatter radar facilities. Since the CUTLASS Finland radar commencedoperation, in February 1995, the mainland EISCAT UHF radar has been run incommon programme 1 and 2 modes for a total duration exceeding 1000 h.Simultaneous and spatially coincident returns from these two radars over thisperiod provide the basis for a comparison of irregularity drift velocity andF-region ion velocity. Initial comparison is limited to velocities from fourintervals of simultaneous radar returns; intervals are selected such that theyexhibit a variety of velocity signatures including that characteristic of theconvection reversal and a rapidly fluctuating velocity feature. Subsequentcomparison is on a statistical basis. The velocities measured by the two systemsdemonstrate reasonable correspondence over the velocity regime encounteredduring the simultaneous occurrence of coherent and incoherent scatter;differences between the EISCAT UHF measurements of F-region ion drift and theirregularity drift velocities from the Finland radar are explained in terms of anumber of contributing factors including contamination of the latter by E-regionechoes, a factor which is investigated further, and the potentially deleteriouseffect of discrepant volume and time sampling intervals.  <b>Key words.</b> Ionosphere (ionospheric irregularities;plasma convection

A comparison of velocity measurements from the CUTLASS Finland radar and the EISCAT UHF system