File:Earthxray polar.png
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Size of this preview: 592 × 600 pixels. Other resolutions: 237 × 240 pixels | 608 × 616 pixels.
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Summary[edit]
| Description |
English: This composite image contains is the first picture of the Earth in X-rays, taken in March, 1996 with the orbiting Polar satellite. The area of brightest X-ray emission is red. The energetic charged particles from the Sun that cause aurora also energize electrons in the Earth's magnetosphere. These electrons move along the Earth's magnetic field and eventually strike the Earth's ionosphere, causing the X-ray emission. These X-rays are not dangerous because they are absorbed by lower parts of the Earth's atmosphere. (The above caption and image are from the Astronomy Picture of the Day for December 30, 1996.) |
| Date | |
| Source | NASA, The Electromagnetic Spectrum, X-rays, url: http://apod.nasa.gov/apod/ap961230.html |
| Author | NASA Official: Ruth Netting |
| Permission (Reusing this file) |
Images from NASA usually are free of copyright. |
| Other versions | File:Earthxray polar.jpg |
The Earth glows in many kinds of light, including the energetic X-ray band. Actually, the Earth itself does not glow - only aurora produced high in the Earth's atmosphere. These aurora are caused by charged particles from the Sun.
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This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.) |  |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 19:54, 28 February 2014 | | 608 × 616 (42 KB) | Scanmap (talk | contribs) |
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