---
description: "What is Direct Beam Radiation: It is the type of solar radiation that directly reaches the surface of the Earth."
title: What is Direct Beam Radiation? - Energy Theory
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---
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# What is Direct Beam Radiation?
By [Elliot Clark](https://energytheory.com/author/elliot_clark/)November 17, 20231 Min Read
Direct beam solar radiation is the** type of solar radiation that directly reaches the surface of the Earth**. Global solar radiation is the total of both diffuse and direct sun radiation. Direct beam radiation can be reduced by atmospheric conditions by 10% on clear, dry days and by 100% on heavy, gloomy days.
### **What is the Measurement of Direct Beam Radiation?**
At various periods of the year, scientists measure the amount of sunshine that strikes particular regions. The amount of sunshine that strikes areas with comparable climates and latitudes is then estimated. Total radiation on a horizontal surface or total radiation on a surface that tracks the sun are the two common ways that solar energy is measured.
**Kilowatt-hours per square meter (kWh/m2)** are frequently used to express [radiation](https://www.cdc.gov/nceh/radiation/what_is.html#:~:text=Radiation%20is%20energy%20that%20comes,call%20radiation%20%E2%80%9Celectromagnetic%20waves%E2%80%9D.) statistics for solar electric (photovoltaic) systems. Watts per square meter (W/m2) can also be used to indicate direct estimations of solar energy.
**British thermal units per square foot (Btu/m2)** are the standard unit of measurement for radiation data for solar water heating and space heating systems.
**Recommended: **[What is Diffuse Radiation?](https://energytheory.com/what-is-diffuse-radiation/)
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[Elliot Clark](https://energytheory.com/author/elliot_clark/)
Elliot is a passionate environmentalist and blogger who has dedicated his life to spreading awareness about conservation, green energy, and renewable energy. With a background in environmental science, he has a deep understanding of the issues facing our planet and is committed to educating others on how they can make a difference.
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