File:Moons shodow in muons.gif

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Summary[edit | edit source]

An image of the shadow of the Moon in muons as produced by the 700m subterranean Soudan 2 detector in the Soudan Mine in Minnesota. The shadow is the result of approximately 120 muons missing from a total of 33 million detected in Soudan 2 over its 10 years of operation. The cross denotes the actual location of the Moon. The shadow of the Moon is slightly offset from this location because cosmic rays are electrically charged particles and were slightly deflected by the Earth's magnetic field on their journey to the upper atmosphere. The shadow is produced due to the shielding effect the Moon has on galactic and cosmic rays, which stream in from all directions. The cosmic rays normally strike atoms high in the upper atmosphere, producing showers of muons and other short lived particles.

Licensing[edit | edit source]

Description	An image of the shadow of the Moon in muons as produced by the 700 m subterranean Soudan 2 detector in the Soudan Underground Mine State Park (Soudan Mine) in Minnesota. The shadow is the result of approximately 120 muons missing from a total of 33 million detected in Soudan 2 over its 10 years of operation. The cross denotes the actual location of the Moon. The shadow of the Moon is slightly offset from this location because cosmic rays are electrically charged particles and were slightly deflected by the Earth's magnetic field on their journey to the upper atmosphere. The shadow is produced due to the shielding effect the Moon has on galactic and cosmic rays, which stream in from all directions. The cosmic rays normally strike atoms high in the upper atmosphere, producing showers of muons and other short lived particles.
Source	http://hepweb.rl.ac.uk/ppUKpics/POW/pr_990602.html and Wikipedia entry on Muons.
Date	March 31, 2000.
Author	J. H. Cobb et al. (The Soudan 2 Collaboration)
Rationale	No free licensed or public domain alternatives known to exist to show an image of the shadow of the Moon in muons as produced by the 700 m subterranean Soudan 2 detector in the Soudan Underground Mine State Park (Soudan Mine) in Minnesota. The shadow is the result of approximately 120 muons missing from a total of 33 million detected in Soudan 2 over its 10 years of operation. The cross denotes the actual location of the Moon. The shadow of the Moon is slightly offset from this location because cosmic rays are electrically charged particles and were slightly deflected by the Earth's magnetic field on their journey to the upper atmosphere. The shadow is produced due to the shielding effect the Moon has on galactic and cosmic rays, which stream in from all directions. The cosmic rays normally strike atoms high in the upper atmosphere, producing showers of muons and other short lived particles.
Permission	Fair use.

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The image is non-free fair use in Muon astronomy.

Fair use for Muon astronomy[edit | edit source]

The image linked here is claimed to be used under fair use as:

it is a scientifically significant photo of a muon astronomy phenomenon;
it is of much lower resolution than the original (copies made from it will be of very inferior quality)
the photo is only being used for informational/educational purposes.
Its inclusion in the article adds significantly to the article because it shows the phenomenon depicted in this article and how it has a significant impact on muon astronomy to the general public.

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	16:49, 18 January 2013		828 × 616 (21 KB)	Marshallsumter (discuss \| contribs)	An image of the shadow of the Moon in muons as produced by the 700m subterranean Soudan 2 detector in the Soudan Mine in Minnesota. The shadow is the result of approximately 120 muons missing from a total of 33 million detected in Soudan 2 over its 10 ...

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