Wavelength-Dependent Solar Limb Darkening with Smartphones, Solar Projection, and SalsaJ

Solar limb darkening is a prominent feature seen in white images of the Sun: the brightness of the solar disk is greatest at the solar center and decreases radially outward towards the limb. White light images can be used to examine and even model limb darkening; however, the limb-darkening effect i...

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Bibliographic Details
Published in:The Physics teacher 2022-12, Vol.60 (9), p.732-734
Main Authors: Birriel, Jennifer J., Wagoner, Jacob M.
Format: Article
Language:English
Subjects:
Astronomy
Computer Software
Educational Technology
Energy
Handheld Devices
Light
Physics
Science Instruction
Scientific Concepts
Telecommunications
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Summary:Solar limb darkening is a prominent feature seen in white images of the Sun: the brightness of the solar disk is greatest at the solar center and decreases radially outward towards the limb. White light images can be used to examine and even model limb darkening; however, the limb-darkening effect is, in fact, wavelength dependent. Limb darkening is more pronounced at the blue end of the spectrum and less at the red end. We discuss a relatively simple method to examine the wavelength-dependent nature of limb darkening using solar projection, smartphone imaging, and SalsaJ software.
ISSN:0031-921X
1943-4928
DOI:10.1119/5.0061547