What percent of light hitting the surface of Earth is UV light?
8% Of the light that reaches Earth's surface, infrared radiation makes up 49.4% of while visible light provides 42.3% 9. Ultraviolet radiation makes up just over 8% of the total solar radiation.
Do UV rays heat the surface of the Earth?
Heating the Earth The surface of the Earth receives about half of the incoming solar radiation. The solar energy takes the form of heat and visible light as well as ultraviolet rays, the type of energy that causes sunburn.
How does the radiation energy reach Earth?
Energy is transferred from the sun to Earth via electromagnetic waves, or radiation. Most of the energy that passes through the upper atmosphere and reaches Earth's surface is in two forms, visible and infrared light. The majority of this light is in the visible spectrum.
How the amount of heat received by the Earth from the Sun?
The atmosphere directly absorbs about 23% of incoming sunlight, and the remaining energy is transferred from the Earth's surface by evaporation (25%), convection (5%), and thermal infrared radiation (a net of 5-6%).
How much radiation do you get from the sun?
Direct sunlight has a luminous efficacy of about 93 lumens per watt of radiant flux. Multiplying the figure of 1050 watts per square meter by 93 lumens per watt indicates that bright sunlight provides an illuminance of approximately 98 000 lux (lumens per square meter) on a perpendicular surface at sea level.
What percent of solar energy is UV?
5% Approximately 5% of solar terrestrial radiation is UVR, and solar radiation is the major source of human exposure to UVR.
Can ultraviolet radiation penetrate the Earth’s atmosphere?
This means that more ultraviolet radiation can pass through the atmosphere to the Earth's surface, particularly at the poles and nearby regions during certain times of the year. Without the layer of ozone in the stratosphere to protect us from excessive amounts of UV-B radiation, life as we know it would not exist.
How much radiation comes from the Sun?
Since 1978 a series of overlapping NASA and ESA satellite experiments have measured total solar irradiance (TSI) – the amount of solar radiation received at the top of Earth's atmosphere – as 1.365 kilowatts per square meter (kW/m2).
How much solar energy reaches the Earth’s surface?
Thus, about 71 percent of the total incoming solar energy is absorbed by the Earth system. Of the 340 watts per square meter of solar energy that falls on the Earth, 29% is reflected back into space, primarily by clouds, but also by other bright surfaces and the atmosphere itself.
How much radiation does the sun emit?
That is the total amount of the sun's energy integrated over wavelengths between about 400-700nm. Roughly 49% of solar radiation is infrared between 700nm-1mm; about 7% is from ultra-violet between 100-400mm; less than 1% of solar radiation is emitted as x-rays, gamma rays and radio waves.
How much part of the solar energy reaches the Earth?
About 30% of the solar energy that reaches Earth is reflected back into space. The rest is absorbed into Earth's atmosphere. The radiation warms the Earth's surface, and the surface radiates some of the energy back out in the form of infrared waves.
How much solar energy hits the Earth?
173,000 terawatts Solar energy is the most abundant energy resource on earth — 173,000 terawatts of solar energy strikes the Earth continuously. That's more than 10,000 times the world's total energy use.
What percentage of incoming ultraviolet is absorbed?
In total approximately 70% of incoming radiation is absorbed by the atmosphere and the Earth's surface while around 30% is reflected back to space and does not heat the surface.
What percentage of ultraviolet rays passes through the ozone layer?
The light you can see is the visible spectrum. Invisible ultraviolet waves have shorter wavelengths and more energy than visible light. About 95 percent of the UV light that passes through the ozone layer gives you a suntan.
Why does only 47% of the sun’s energy reach Earth’s surface?
Only a part of solar radiation reaches the Earth's surface: 34% of solar radiation is reflected into space by the atmosphere, by clouds and by the Earth's surface itself. Of the remaining 66%, 19% is absorbed by water vapour, by clouds and by the ozone layer and only 47% on average is absorbed by the Earth's surface.
How much energy does the sun deliver to Earth?
In a single hour, the amount of power from the sun that strikes the Earth is more than the entire world consumes in an year. To put that in numbers, from the US Department of Energy: Each hour 430 quintillion Joules of energy from the sun hits the Earth. That's 430 with 18 zeroes after it!
How much radiation does the Earth emit?
The 70 units of incoming solar radiation make it into Earth's atmosphere. This is equivalent to 240 watts per square meter (70% of 342 W/m2). The atmosphere and clouds absorb 19 units of this incoming solar radiation, leaving 51 units of solar radiation that is absorbed at Earth's surface.
Why only 47% of the sun’s energy reaches the surface of the Earth?
Only a part of solar radiation reaches the Earth's surface: 34% of solar radiation is reflected into space by the atmosphere, by clouds and by the Earth's surface itself. Of the remaining 66%, 19% is absorbed by water vapour, by clouds and by the ozone layer and only 47% on average is absorbed by the Earth's surface.
Why only 48 to 51% of insolation reaches the Earth’s surface?
Only 51% of the insolation reaches the earth's surface because 35% is reflected back into space by the atmospheric layers and 14% is absorbed by the atmosphere.
How much of the sun’s energy is absorbed by Earth?
approximately 70% In total approximately 70% of incoming radiation is absorbed by the atmosphere and the Earth's surface while around 30% is reflected back to space and does not heat the surface. The Earth radiates energy at wavelengths much longer than the Sun because it is colder.
Where is over 95% of the incoming ultraviolet radiation absorbed?
Ozone absorbs the most energetic wavelengths of ultraviolet light, known as UV-C and UV-B, wavelengths that harm living things. Oxygen molecules absorb other forms of ultraviolet light, too. Together, ozone and oxygen molecules are able to absorb 95 to 99.9% of the ultraviolet radiation that gets to our planet.
How many percent of the sun’s energy is absorbed by the atmosphere and clouds?
About 23 percent of incoming solar energy is absorbed in the atmosphere by water vapor, dust, and ozone, and 48 percent passes through the atmosphere and is absorbed by the surface. Thus, about 71 percent of the total incoming solar energy is absorbed by the Earth system.
How does UV radiation penetrate the atmosphere?
As sunlight passes through the atmosphere, all UVC and most UVB is absorbed by ozone, water vapour, oxygen and carbon dioxide. UVA is not filtered as significantly by the atmosphere. Is there a connection between ozone depletion and UV radiation? Ozone is a particularly effective absorber of UV radiation.
What percentage of energy comes from the sun?
100% of the energy entering the earth's atmosphere comes from the sun. 51% of the incoming energy is absorbed by the earth's surface i.e. the land and oceans.
How much energy hits the Earth’s surface?
173,000 terawatts A total of 173,000 terawatts (trillions of watts) of solar energy strikes the Earth continuously. That's more than 10,000 times the world's total energy use.
How much energy does the sun radiate?
At any moment, the sun emits about 3.86 x 1026 watts of energy. So add 24 zeros to the end of that number, and you'll get an idea of how unimaginably large an amount of energy that is! Most of that energy goes off into space, but about 1.74 x 1017 watts strikes the earth.
How much radiation do we get from the Sun?
Average Annual Dose for Natural Sources of Radiation The average annual dose due to cosmic radiation in the US is 0.34 mSv (34 mrem) per year. This low radiation dose is unlikely to affect human health.
How many percent of the Sun’s energy is absorbed by the atmosphere and clouds?
About 23 percent of incoming solar energy is absorbed in the atmosphere by water vapor, dust, and ozone, and 48 percent passes through the atmosphere and is absorbed by the surface. Thus, about 71 percent of the total incoming solar energy is absorbed by the Earth system.
What is only 51% of the insolation reach the Earth surface?
Only 51% of the insolation reaches the surface of the Earth as out of the remaining 49%, 35% of the insolation is directly reflected back to space by the atmosphere and the rest of the 14% is absorbed by the ozone layer.
Where is over 95% of incoming ultraviolet radiation absorbed a the stratosphere B the mesosphere?
The ozone layer is a thin part of the Earth's atmosphere that absorbs almost all of the sun's harmful ultraviolet light.