What is sunlight?

sunlight is full of light spectrum released by the sun. It includes visible light and all other radiation frequencies on the electromagnetic spectrum. Compared to the known sources of energy on Earth, the sun emits a huge amount of energy into space. The type of radiation of the Sun is the product of its high temperature, which is caused by nuclear fusion inside the core of the sun. The sun is studied by scientists for its effects on phenomena on Earth, such as weather and astronomy.

The sun was created about 4.5 billion years ago, when a gas cloud collapsed. Gravity caused a large amount of matter that was primarily of hydrogen; Very high pressure led to the core of the sun. This pressure became so large that hydrogen atoms began to join together, a process that releases a lot of thermal energy. The temperature of any mass collection, including the Sun, is what the provoker emitted radiation.

Only a small part of the sunlight sometimes reaches the ground; Most are emitted into empty space. Even a fraction that reaches the ground is much greater than the amount of energy that consumes sources on Earth, such as fossil fuels. The average energy consumed by humans during 2008 was about 1.5 x 10

13

watts. By comparison, the average force than reaching Earth through sunlight is more than 10,000 times larger. A huge amount of energy emitted by the sun can be attributed to its large weight and high temperature.

sunlight is measured in different ways. One tool that measures sunlight from the entire 180 -degree field is called a pyranometer. The pyrheliometer is a device that is directed directly to the sun for radiation measurement. Sun radiation is measured in the amount called irradiation, which has a standard obscene watts per square meter. The average solar radiation at the distance of the Earth from the Sun is about 1,366 watts per square meter.

Solar radiation measurements tend to fluctuate over time. Part of the reason for this turnover is that the Earth's orbit is not perfectly circular and the Earth's observers constantly change the distance from the Sun. Real changes in sunlight also lead to measurement fluctuations, but these quantities are usually small. It has been observed that some of these variations follow the eleven -year cycle. Periodic fluctuations have been measured to affect the levels of solar radiation by 0.1%