In meteorology, a Polar Front is the boundary between the polar cell and the Ferrel cell in each hemisphere. At this boundary a sharp gradient in temperature occurs between these two air masses, each at very different temperatures. Satellite image of Hurricane Hugo with a polar low visible at the top of the image. ... This article needs cleanup. ...
A polar low is a small-scale, short-lived atmospheric low pressure system (depression) that is found over the ocean areas poleward of the main polarfront in both the Northern and Southern Hemispheres.
The most active polar lows are found over certain ice-free maritime areas in or near the Arctic during the winter, such as the Norwegian Sea, Barents Sea, Sea of Japan, and Gulf of Alaska.
Polar lows are very difficult to forecast and a nowcasting approach is often used, with the systems being advected with the mid-tropospheric flow.
Regardless of whether polarization ellipses are represented using geometric parameters or Jones vectors, implicit in the parameterization is the orientation of the coordinate frame.
Many animals are apparently capable of perceiving the polarization of light, which is generally used for navigational purposes, since the linear polarization of sky light is always perpendicular to the direction of the sun.
Polarization is principally of importance in chemistry due to the (circular) dichroism and "optical rotation" (circular birefringence) exhibited by optically active (chiral) molecules.
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