solenoidal index

The difference between the mean virtual temperature from the surface to some specified upper level averaged around the earth at 55ø latitude, and the mean virtual temperature for the corresponding layer averaged at 35ø latitude.

Related terms:

• zonal index
• circulation index
• polar-easterlies index
• meridional index
• temperate-westerlies index
• subtropical easterlies index
• U index
• plasticity index
• wind-chill index
• shrinkage index