For the polar vortex area on the Northern Hemisphere, in summer the polar vortexboundary withdraw about 30 latitudes than winter.
冬夏季北半球极涡面积的比较发现夏季和冬季相比极涡边界收缩了近30个纬度。
2
These solutions belong to the intrinsic electromagnetic vortices, the corresponding magnetic field perturbations and the longitudinal current are continuous on the boundary of the vortex.
这些解属于本性电磁涡旋,对应的扰动磁场和纵向电流在涡旋边界上是连续的。
3
To predict helicopter vortex ring state boundary is necessary for flight safety.