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heliosphere |
Also found in: Dictionary/thesaurus, Wikipedia, Hutchinson | 0.02 sec. |
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heliosphere [′hē·lē·ə‚sfir] (astronomy) The region surrounding the sun where the solar wind dominates the interstellar medium. Also known as solar cavity. (geophysics) The region in the ionosphere where helium ions are predominant (sometimes there may be no region in which helium ions dominate). How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Contracting or expanding as the solar wind blows slower or faster, the heliosphere generously envelops all the planets. A They're still in the heliosphere [see diagram, above]. Data suggest that the edge of the shock could be one billion miles closer to the sun in the southern region of the solar system than in the north, suggesting perhaps that the heliosphere is irregularly shaped. |
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