Blue twilight in a simple atmosphere

Philip A. Ekstrom

doi:10.1117/12.482305

5 September 2002 Blue twilight in a simple atmosphere

Philip A. Ekstrom

Proceedings Volume 4815, Atmospheric Radiation Measurements and Applications in Climate; (2002) https://doi.org/10.1117/12.482305
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

Abstract

Assuming a curved exponential atmosphere with beam attenuation and isotropic scattering both proportional to density, we model three regimes that each become dominant in turn as the sun sets. This drastic simplification of the earth's real atmosphere both provides insight to guide system design and is able to fit over an irradiance range exceeding nine decades a set of narrowband measurements of blue light intensity made in the natural environment on clear days. The single-scattering regime involves only overall illumination (or cloudiness) as an adjustable parameter and appears especially relevant to animal geolocation based on measurement of diffuse irradiance.

Citation Download Citation

Philip A. Ekstrom "Blue twilight in a simple atmosphere", Proc. SPIE 4815, Atmospheric Radiation Measurements and Applications in Climate, (5 September 2002); https://doi.org/10.1117/12.482305

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available