Stronger tornadoes are also those most observed to have multiple vortices (or, subvortices) in which two or more columns of spinning air rotate around a common center. Multivortex structure occurs in smaller tornadoes, and large weak tornadoes, as well as other circulations. A satellite tornado is a term for a weaker tornado which forms very near a large, strong tornado contained within the same mesocyclone. The satellite tornado may appear to "orbit" the larger tornado (hence the name), giving the appearance of one, large multi-vortex tornado. However, a satellite tornado is a distinct funnel, and is much smaller than the main funnel.. Occasionally a single storm may produce multiple tornadoes and mesocyclones. This process is known as cyclic tornadoegenesis.