irradiancen.
/ɪˈreɪdɪəns/, U.S. /ᵻˈreɪdiəns/ 1. The fact of irradiating; the emission of rays of light, emitted radiance. Also figurative in reference to spiritual or intellectual radiance.
ΘΚΠ
the world > matter > light > [noun] > ray or beam > emission of
beaming1398
radiationa1500
radiancea1593
radiancy1595
irradiation1599
eradiation1633
irradiancy1646
actinobolism1654
radiature1663
effulgence1667
irradiance1667
circumradiancy1673
diradiation1706
beaminess1741
raying1787
rayonnance1848
radiate1889
1667 J. Milton Paradise Lost viii. 617 Do they mix Irradiance, virtual or immediate touch? View more context for this quotation
1735–6 H. Brooke Universal Beauty vi. 339 Thou awful Depth of Wisdom unexplor'd! Thou Height, where never human fancy soar'd! Supreme Irradiance!
a1760 I. H. Browne Poems (1768) 106 They, from irradiance of thy genial beam Prolific, with immortal offspring teem.
1888 B. W. Richardson Son of Star III. xi. 176 A kingdom to which the world will come for irradiance.
2. The flux of radiant energy per unit area, esp. an area normal to the direction of travel through a medium.
ΘΚΠ
the world > matter > physics > electromagnetic radiation > solar radiation > [noun]
sun power1853
sun force1857
solar power1915
irradiance1956
solar1976
the world > matter > physics > electromagnetic radiation > light > intensity of light, luminosity > [noun]
brightness1674
self-luminosity1841
illumination1863
luminosity1898
illuminance1943
luminance1950
irradiance1956
1956 A. Hollaender Radiation Biol. III. iii. 129 ‘Irradiance’ is the intensity term applicable to the interception of radiant energy by objects and is power per unit area. Frequently ‘intensity’ is used loosely as a substitute for ‘irradiance’.
1956 A. Hollaender Radiation Biol. III. iii. 136 The U.S. Weather Bureau..still uses the calorie per minute per square centimeter for the specification of solar irradiance.
1966 McGraw-Hill Encycl. Sci. & Technol. (rev. ed.) XII. 105/2 At a depth of 64 m where the irradiance is 0·5 watt/m2..approximately 0·04 watt of radiant power is absorbed by every cubic meter of sea water.
1969 Physics Bull. Oct. 409/2 Outside the earth's atmosphere..the annual mean irradiance of the sun is about 270 W m–2 on a plane parallel to the earth's surface at latitude 52° N.
1973 Nature 9 Feb. 402/1 The total irradiance of the unattenuated light..was approximately 4·5 × 103 μW/cm2.
This entry has not yet been fully updated (first published 1900; most recently modified version published online March 2022).
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