COMMENT ON ON THE SOURCE REGION OF TRAVELING CONVECTION VORTICES BY YAHNIN,A.G. ET-AL

The source regions of traveling convection vortices (TCV) observed in the dayside magnetosphere outside the near noon sector have been mappe d to magnetospheric locations within the outer radiation belt, but not to the Central Plasma Sheet (CPS) as claimed by Yahnin and Moretta [1 996] and Yahnin et al. [1997]. Their suggested connection between TCV and the CPS is based on the unjustified application of terminology tra ditionally used for the auroral precipitation structure in the nightsi de magnetospheric sector [Winningham et al. 1975] to the late morning- noon sector. This is a case where an important finding on the location of TCV with respect to natural magnetospheric boundaries has been pre sented using misleading terminology, which leads to an incorrect physi cal interpretation of the result. Hence this Comment emphasizes the ne ed for a critical reexamination and modification of the ''traditional' ' terminology concerning the plasma domain structure in the magnetosph ere.