| Detection of emerging sunspot regions in the solar interior. | |
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MedLine Citation:
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PMID: 21852494 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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Sunspots are regions where strong magnetic fields emerge from the solar interior and where major eruptive events occur. These energetic events can cause power outages, interrupt telecommunication and navigation services, and pose hazards to astronauts. We detected subsurface signatures of emerging sunspot regions before they appeared on the solar disc. Strong acoustic travel-time anomalies of an order of 12 to 16 seconds were detected as deep as 65,000 kilometers. These anomalies were associated with magnetic structures that emerged with an average speed of 0.3 to 0.6 kilometer per second and caused high peaks in the photospheric magnetic flux rate 1 to 2 days after the detection of the anomalies. Thus, synoptic imaging of subsurface magnetic activity may allow anticipation of large sunspot regions before they become visible, improving space weather forecast. |
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Authors:
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Stathis Ilonidis; Junwei Zhao; Alexander Kosovichev |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
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Title: Science (New York, N.Y.) Volume: 333 ISSN: 1095-9203 ISO Abbreviation: Science Publication Date: 2011 Aug |
Date Detail:
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Created Date: 2011-08-19 Completed Date: 2011-08-30 Revised Date: 2012-04-20 |
Medline Journal Info:
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Nlm Unique ID: 0404511 Medline TA: Science Country: United States |
Other Details:
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Languages: eng Pagination: 993-6 Citation Subset: - |
Affiliation:
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W. W. Hansen Experimental Physics Laboratory, Stanford University, Stanford, CA 94305-4085, USA. ilonidis@sun.stanford.edu |
Export Citation:
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Descriptor/Qualifier:
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| Comments/Corrections | |
Comment In:
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Science. 2012 Apr 20;336(6079):296; author reply 296
[PMID:
22517843
]
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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