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Measuring Light

Sönke Johnsen

in The Optics of Life: A Biologist's Guide to Light in Nature

Published in print:
2011
Published Online:
October 2017
ISBN:
9780691139906
eISBN:
9781400840663
Item type:
chapter
Publisher:
Princeton University Press
DOI:
10.23943/princeton/9780691139906.003.0009
Subject:
Biology, Evolutionary Biology / Genetics

This chapter discusses light measurement. Conversions between different integrated measurements such as lux and photosynthetically active radiation (PAR) can be done if one knows the spectrum of the ... More


INCOMING SOLAR RADIATION

I. M. Vardavas and F. W. Taylor

in Radiation and Climate

Published in print:
2007
Published Online:
January 2008
ISBN:
9780199227471
eISBN:
9780191711138
Item type:
chapter
Publisher:
Oxford University Press
DOI:
10.1093/acprof:oso/9780199227471.003.0005
Subject:
Physics, Geophysics, Atmospheric and Environmental Physics

This chapter examines the factors that determine the amount of solar radiation that reaches the Earth, and which primarily controls its climate. On timescales of billion years, the Sun evolves as a ... More


Units and Geometry

Sönke Johnsen

in The Optics of Life: A Biologist's Guide to Light in Nature

Published in print:
2011
Published Online:
October 2017
ISBN:
9780691139906
eISBN:
9781400840663
Item type:
chapter
Publisher:
Princeton University Press
DOI:
10.23943/princeton/9780691139906.003.0002
Subject:
Biology, Evolutionary Biology / Genetics

This chapter explores units and geometry in light measurement. For biologists not working on humans, it comes down to a few simple rules: use photons not watts; use wavelength not frequency, but be ... More


We Look Before and After

Arnab Rai Choudhuri

in Nature’s Third Cycle: A Story of Sunspots

Published in print:
2015
Published Online:
April 2015
ISBN:
9780199674756
eISBN:
9780191752469
Item type:
chapter
Publisher:
Oxford University Press
DOI:
10.1093/acprof:oso/9780199674756.003.0009
Subject:
Physics, Particle Physics / Astrophysics / Cosmology

This chapter begins by discussing the recent efforts of reconstructing the past history of sunspot activity, with some comments on the ill-understood subject of the possible effects of the sunspot ... More


Basic Solar and Planetary Properties

Kelly Chance and Randall V. Martin

in Spectroscopy and Radiative Transfer of Planetary Atmospheres

Published in print:
2017
Published Online:
May 2017
ISBN:
9780199662104
eISBN:
9780191748370
Item type:
chapter
Publisher:
Oxford University Press
DOI:
10.1093/oso/9780199662104.003.0001
Subject:
Physics, Geophysics, Atmospheric and Environmental Physics

Basic properties of the Sun, the Earth and its atmosphere, other solar system atmospheres, and extrasolar planetary atmospheres are introduced here to provide background and context for the detailed ... More


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