Alaska is called as mid night sun because of it's position in Arctic Circle,latitude 66°33' north.
Explanation:
When the sun is located above the horizon for a full 24 hours,it is called as summer solstice and when it is located below the the horizon for a full 24 hours, it is called winter Solstice.
In Alaska, sun travels at 360° direction in the sky thus Alaska receives 24 hour of light during summer time.
Doldrums are caused by solar radiation from the sun. Because of this the sunlight beams warms the air and causes it to rise straight up instead of side to side (horizontally).
