irradiance

American  

[ih-rey-dee-uhns] / ɪˈreɪ di əns /

noun

Physics.

1. incident flux of radiant energy per unit area.

---

irradiance British  

/ ɪˈreɪdɪəns /

noun

1. Also called: irradiation.   Ee.  the radiant flux incident on unit area of a surface. It is measured in watts per square metre Compare illuminance

---

Etymology

Origin of irradiance

First recorded in 1660–70; ir- ¹ + radiance

Compare meaning

How does irradiance compare to similar and commonly confused words? Explore the most common comparisons:

• irradiance vs. radiance

Example Sentences

Despite considerable progress, the quest for efficient photon upconversion has faced challenges due to inherent limitations in the irradiance of lanthanide-doped nanoparticles and the critical coupling conditions of optical resonances.

From Science Daily • Feb. 22, 2024

They establish a positive correlation between cloud activity and the amount of electromagnetic energy emitted by the Sun at a very specific wavelength, which is known as Solar Lyman-Alpha irradiance.

From Salon • Aug. 25, 2023

But for solar power generation, the amount of sunshine - also referred to as irradiance - is more important than the amount of heat,

From BBC • Jul. 19, 2022

We know that, from 1900 until the 1950s, solar irradiance increased.

From New York Times • Apr. 19, 2021

Frail beauty, green, gold and incandescent whiteness, narcissi, daffodils, you have brought me Spring and longing, wistfulness, in your irradiance.

From Some Imagist Poets An Anthology by Aldington, Richard