Well, because the sun's insolation is at its highest.
Averaged through the year, Polar Climates receive the least insolation at the surface. Because these latitudes are tilted further from the sun, solar radiation must pass through more of the atmosphere, and is therefore attenuated.
Sunspots
insolation
Only on each equinox.
Tropical
Summer
The tropical climate zone receives the highest insulation.
Well, because the sun's insolation is at its highest.
Direct and diffused insolation.
lake michigan,grassy plains of kansa, sahara dessert, arctic glacier
Insolation is a measurement of the solar radiation received by a surface over a unit time. Polar regions have the lowest insolation.
The duration of insolation on March 21 is 12 hours daylight. The duration of insolation is dependent on temperature, season and latitude.
Insolation
1.ocean 2.grassy lands 3.sandy lands 4.ice
Solar panels that convert sunlight to electrical energy are an application of insolation.
Polar