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- 774–775_carbon-14_spike abstract "The 774–775 Carbon-14 Spike is an observed increase of 1.2% in the concentration of carbon-14 isotope in tree rings dated to the years 774 or 775 CE, which is about 20 times as high as the normal background rate of variation. It was discovered during a study of Japanese cedar trees, with the year of occurrence determined through dendrochronology. A surge in a specific isotope of beryllium (10Be), detected in Antarctic ice cores, has also been associated with the 774-775 event.The event appears to have been global, with the same carbon-14 signal found in tree rings from Germany, Russia, the United States, and New Zealand. A \"red crucifix\" was recorded by the Anglo-Saxon Chronicle as appearing in the skies of Britain for the year 774; since no supernova remnant has been found for this year, it is interpreted as an aurora borealis.The signal exhibits a sharp increase of ~1.2% followed by a slow decline (see Figure 1), which is typical for an instant production of carbon-14 in the atmosphere, indicating that the event was short in duration. The globally averaged production of carbon-14 for this event is calculated as Q= (1.1-1.5)×108 atoms/cm2.".
- 774–775_carbon-14_spike thumbnail Time_profile_of_the_774_AD_spike_in_C-14..jpg?width=300.
- 774–775_carbon-14_spike wikiPageExternalLink watch?v=inIFO5ZvdqM.
- 774–775_carbon-14_spike wikiPageID "36064581".
- 774–775_carbon-14_spike wikiPageLength "7810".
- 774–775_carbon-14_spike wikiPageOutDegree "27".
- 774–775_carbon-14_spike wikiPageRevisionID "707651212".
- 774–775_carbon-14_spike wikiPageWikiLink 993–994_carbon-14_spike.
- 774–775_carbon-14_spike wikiPageWikiLink Anglo-Saxon_Chronicle.
- 774–775_carbon-14_spike wikiPageWikiLink Aurora.
- 774–775_carbon-14_spike wikiPageWikiLink Beryllium.
- 774–775_carbon-14_spike wikiPageWikiLink Carbon-14.
- 774–775_carbon-14_spike wikiPageWikiLink Category:774.
- 774–775_carbon-14_spike wikiPageWikiLink Category:775.
- 774–775_carbon-14_spike wikiPageWikiLink Category:Astronomical_events.
- 774–775_carbon-14_spike wikiPageWikiLink Category:Dendrology.
- 774–775_carbon-14_spike wikiPageWikiLink Category:Stratigraphy.
- 774–775_carbon-14_spike wikiPageWikiLink Common_Era.
- 774–775_carbon-14_spike wikiPageWikiLink Cryptomeria.
- 774–775_carbon-14_spike wikiPageWikiLink Dendrochronology.
- 774–775_carbon-14_spike wikiPageWikiLink Gamma-ray_burst.
- 774–775_carbon-14_spike wikiPageWikiLink Germany.
- 774–775_carbon-14_spike wikiPageWikiLink Holocene.
- 774–775_carbon-14_spike wikiPageWikiLink Isotopes_of_beryllium.
- 774–775_carbon-14_spike wikiPageWikiLink Isotopes_of_chlorine.
- 774–775_carbon-14_spike wikiPageWikiLink List_of_solar_storms.
- 774–775_carbon-14_spike wikiPageWikiLink New_Zealand.
- 774–775_carbon-14_spike wikiPageWikiLink Russia.
- 774–775_carbon-14_spike wikiPageWikiLink Solar_flare.
- 774–775_carbon-14_spike wikiPageWikiLink United_States.
- 774–775_carbon-14_spike wikiPageWikiLink File:Time_profile_of_the_774_AD_spike_in_C-14..jpg.
- 774–775_carbon-14_spike wikiPageWikiLinkText "774–775 carbon-14 spike".
- 774–775_carbon-14_spike wikiPageWikiLinkText "AD 774–775".
- 774–775_carbon-14_spike wikiPageWikiLinkText "an increase of 1.2% in AD 774".
- 774–775_carbon-14_spike wikiPageWikiLinkText "very strong solar storm".
- 774–775_carbon-14_spike wikiPageUsesTemplate Template:Clarify.
- 774–775_carbon-14_spike wikiPageUsesTemplate Template:Reflist.
- 774–775_carbon-14_spike wikiPageUsesTemplate Template:Solar_storms.
- 774–775_carbon-14_spike subject Category:774.
- 774–775_carbon-14_spike subject Category:775.
- 774–775_carbon-14_spike subject Category:Astronomical_events.
- 774–775_carbon-14_spike subject Category:Dendrology.
- 774–775_carbon-14_spike subject Category:Stratigraphy.
- 774–775_carbon-14_spike hypernym Increase.
- 774–775_carbon-14_spike type Disease.
- 774–775_carbon-14_spike type Event.
- 774–775_carbon-14_spike type Event.
- 774–775_carbon-14_spike comment "The 774–775 Carbon-14 Spike is an observed increase of 1.2% in the concentration of carbon-14 isotope in tree rings dated to the years 774 or 775 CE, which is about 20 times as high as the normal background rate of variation. It was discovered during a study of Japanese cedar trees, with the year of occurrence determined through dendrochronology.".
- 774–775_carbon-14_spike label "774–775 carbon-14 spike".
- 774–775_carbon-14_spike sameAs Q4643553.
- 774–775_carbon-14_spike sameAs Subida_de_carbono-14_de_774-775.
- 774–775_carbon-14_spike sameAs 775年の宇宙線飛来.
- 774–775_carbon-14_spike sameAs m.0j_5c7w.
- 774–775_carbon-14_spike sameAs Q4643553.
- 774–775_carbon-14_spike wasDerivedFrom 774–775_carbon-14_spike?oldid=707651212.
- 774–775_carbon-14_spike depiction Time_profile_of_the_774_AD_spike_in_C-14..jpg.
- 774–775_carbon-14_spike isPrimaryTopicOf 774–775_carbon-14_spike.