你說差不多。你能給出數字嗎？

 

給你抄一段Wikipedia, the free encyclopedia 

希望你能讀英文，嘿嘿

Van Allen radiation belts

The Van Allen radiation belt is a torus of energetic charged particles (plasma) around Earth, which is held in place by Earth's magnetic field. It is believed that most of the particles that form the belts come from solar wind, and other particles by cosmic rays.^[1] It is named after its discoverer, James Van Allen, and is located in the inner region of the Earth's magnetosphere. It is split into two distinct belts, with energetic electrons forming the outer belt and a combination of protons and electrons forming the inner belts. In addition, the radiation belts contain lesser amounts of other nuclei, such as alpha particles. The belts pose a hazard to satellites, which must protect their sensitive components with adequate shielding if their orbit spends significant time in the radiation belts.

 

 

 

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• 你也在轉移話題了！月亮呢？怎麽與地球差不多？ -iwbb- ♀ (0 bytes) () 11/14/2011 postreply 10:29:35