Because In December the north pole points away from the sun and does not receive any sunlight
Where: It occurs in the Thermosphere.Why: In the thermosphere, temperature increases steadily as altitude increases because nitrogen and oxygen atoms absorb solar radiation, and so in the ionosphere (the lower region of thermosphere at the altitude of 80 - 400 km) solar radiation that is absorbed by atmospheric gases causes the atoms of gas molecules to lose electrons and to produce ions and free electrons. Interaction between solar radiation and the ionosphere causes the phenomena known as auroras.
North Hemisphere
North Pole
While the amount of sunlight in the northern hemisphere does start to increase, it is still below what it is in the other seasons, and most of the area north of the Arctic Circle is still in darkness. As a result, the high northern latitudes are still losing more heat to space than they receive from the sun.
If we are talking about solar heating it warms mostly the equator. If we are talking about actual radiation we are least protected from it at the North and South pole. So even though the radiation itself may not be directed at the poles that is where a person would experience it the most.
In June, the outer edge of the atmosphere at the equator receives less solar radiation than the north pole and 40 degrees north latitude because the angle of incidence of the sun's rays is lower at the equator due to the Earth's axial tilt. This results in the solar radiation being spread over a larger area at the equator compared to the more concentrated radiation received at higher latitudes.
december
The poles are located at 90 degrees latitude. They are located at that part of the Earth's surface which is consistently the furthest from the the sun's heat and light radiation. The locations also receive radiation which has travelled the greatest distance within the atmosphere within which to be absorbed. These locations are, therefore, the coldest regions on the Earth's surface.
Zero
I don't know, and I don't care. Yes
The north pole receives more solar radiation during the summer than the equator does, but during winter, it receives no solar radiation. This means that as latitude increases, the amount of solar radiation increases in the summer and decreases in the winter.
Yes, it usually snows in December in North Dakota.
On December 24th in the North Pole-it is completely dark. No sun.
Yes, if you move from the equator towards the North Pole, you would receive less solar radiation because the angle of the sunlight hitting the Earth's surface becomes more oblique. This oblique angle causes the same amount of solar energy to be spread out over a larger area, resulting in less intensity of sunlight.
Moonlight and atmosphere.
The University of North Carolina has a Radiation Oncology degree program. They are located in Chapel Hill, North Carolina. Here's the web address for detailed info: www.med.unc.edu/radonc/
Actually the warmest are found closer to the tropics (23° North and South of the Equator). This is because those areas get sunlight directly overhead where the radiation of the Sun passes through the least atmosphere and has the greatest energy.