irradiance

noun
ir·​ra·​di·​ance | \i-ˈrā-dē-ən(t)s \

Definition of irradiance 

2 : the density of radiation incident on a given surface usually expressed in watts per square centimeter or square meter

Examples of irradiance in a Sentence

Recent Examples on the Web

The next thing to determine is to think about the solar irradiance. Rhett Allain, WIRED, "The Physics of NASA's New Mars Helicopter," 16 May 2018 With this size, irradiance, length of a day, and an efficiency of 25 percent, that would give a total energy of about 40,000 Joules. Rhett Allain, WIRED, "The Physics of NASA's New Mars Helicopter," 16 May 2018 The solar cycle also plays a minor role in climate, as variations in irradiance can cause slight changes in average sea-surface temperatures and precipitation patterns. Shannon Hall, Scientific American, "The Sun Is Spitting Out Strange Patterns of Gamma Rays—and No One Knows Why," 28 Mar. 2018 From fiber optics to solar irradiance, watch how this @ISS_Research is seeking to offer benefits back on Earth and expand space exploration. Sabrina Eaton, cleveland.com, "NASA Glenn experiments head to International Space Station," 15 Dec. 2017 That was a problem for the U.S. federal research facility Pacific Northwest National Laboratory (PNNL), which needed something that could carry lots of equipment to measure solar irradiance, three-dimensional windspeed, and analyze air particulates. David Hambling, Popular Mechanics, "The Winter-Proof Drone That Will Watch the Arctic," 13 July 2017 Most of all, evolution seems fond of using moonlight as mood lighting: Many species of all shapes and sizes use the moon’s ghostly irradiance, and its 29.5-day waxing and waning, to cue various phases of reproduction. National Geographic, "Sex, Death, and Pollination: How the Moon Changes Life on Earth," 6 July 2017 On Thursday afternoon, the SDO saw something much more simple than solar irradiance fluctuations or extreme ultraviolet variability — the moon blocking out the sun in a solar eclipse only visible from the satellite. Angela Fritz, Washington Post, "A NASA satellite just caught this awesome solar eclipse from space," 26 May 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'irradiance.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of irradiance

1599, in the meaning defined at sense 1

Keep scrolling for more

Learn More about irradiance

Share irradiance

Dictionary Entries near irradiance

Irpex

IRQ

irr

irradiance

irradiancy

irradiant

irradiate

Statistics for irradiance

Look-up Popularity

Time Traveler for irradiance

The first known use of irradiance was in 1599

See more words from the same year

Keep scrolling for more

More Definitions for irradiance

irradiance

noun
ir·​ra·​di·​ance | \ir-ˈād-ē-ən(t)s \

Medical Definition of irradiance 

: the density of radiation incident on a given surface usually expressed in watts per square centimeter or square meter

Comments on irradiance

What made you want to look up irradiance? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

a nest or breeding place

Get Word of the Day daily email!

Test Your Vocabulary

Late Autumn 2018 Words of the Day Quiz

  • frosted-autumn-leaves
  • Which is a synonym of yahoo?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!