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Studia Geophysica et Geodaetica

, Volume 30, Issue 1, pp 93–110 | Cite as

Solar activity variations and climatic changes

  • Vojtěch Leftus
  • J. Tomlain
  • V. Vítek
Article

Summary

For the last two millenia it has been possible to determine the secular variation of solar activity from naked-eye sunspots, aurorae and radiocarbon variations. The results of the analysis of old East Asian observations of comets, which reflect the night cloudiness variation, do not agree with the former findings that the long-term climatic changes derived from comets depend on solar activity. The distinct anticorrelation between the Chinese records of comets and naked-eye sunspots is found only for the period from the 3rd to 6th century A.D., but in other centuries any correlation can hardly be seen. East Asian cometary observations give evidence of climatic changes in different parts of this large geographic region.

Secular variations of the River Nile levels, regularly measured from the 7th to 15th century A.D., clearly correlate with the solar variations, which suggests evidence for solar influence on the climatic changes in the East African tropics. The decline of the Kingdoms in ancient Egypt and the occurrence of the Intermediate Periods are generally explained by very low Nile floods and prolonged droughts followed by severe famines and the destruction of the political structure. But the radiocarbon data show that at least the First and Second Intermediate Periods coincide with the secular maxima of solar activity and the Middle Kingdom with the minimum. This contradicts the positive correlation found from the eight centuries of measurements of River Nile levels made by Arabs. It seems that the influence of solar activity on the secular climatic changes has an episodic character.

Keywords

Solar Activity Secular Variation Intermediate Period Large Geographic Region Solar Activity Variation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Резюме

Долгоnерuо¶rt;ные uзмененuя солнечноŭ aкmuвносmu можно ¶rt;осmamочно mочно оnре¶rt;елumь nрuблuзumельно зa nосле¶rt;нuе ¶rt;вa mысячелеmuя nумеm срaвненuя nоявленuя nолярных сuянuŭ u вu¶rt;uмых неовооруженымглaзом солнечных nяmен с рa¶rt;uоуглеро¶rt;нымu uзмененuямu. Вековоŭ хо¶rt; чaсmоmы nоявленuя nолярных сuянuŭ с мuнuмумом в nервых сmолеmuлх н.э. можно объяснumь кaк эффекm влuянuя векового хо¶rt;a uнmенсuвносmuгеомaгнumного nоля. Схо¶rt;сmво вaрuaцuŭ nоявленuя комеm с солнечноŭ aкmuвносmью обълснuвaлось кaк влuянuе солнечноŭ aкmuвносmu нa ночную облaчносmь — фaкmор, оmрaжaющuŭ ¶rt;олгоnерuо¶rt;ные клuмamuческuе uзмененuя. О¶rt;нaко, резульmamы aнaлuзa ¶rt;ревнuх нaблю¶rt;енuŭ комеm u всnыщек новых нa Дaльнем Восmоке не соглaсуюmся с зmuмu выво¶rt;aмu. Срaвнuвaя ¶rt;ревнекumaŭскuе зanuсu о комеmaх u вu¶rt;uмых невооруженымглaзовом со лнечных nяmнaх, можно обнaружumь явную aнmuкорреляцuю mолько ¶rt;ля nерuо¶rt;a с з-ŭ nо 6-ŭ век, a в ¶rt;ругuх nерuо¶rt;aх maкaя коррляцuя оmсуmсmвуеm. Более mого, слaбaя корреляцuuя uлu оmсуmсmвuе корреляцuu меж¶rt;у ¶rt;aннымu о нaблю¶rt;енuu комеm в Кumaе, Корее u Яnонuu свu¶rt;umельсmвуеm о рaзлuчuu uзмененuŭ клuмama в рaзлuчных чaсmях эmоŭ большоŭгеогрaфuческоŭ облaсmu.

Долгоnерuо¶rt;ные вaрuaцuu высоmы nо¶rt;ъемa во¶rt;ы (мaксuмумы), a maкже maк нaзвывaемоŭ „сmaроŭ во¶rt;ы“ (мuнuмумы) в Нuле nо uзмеренuям, регулярно nрово¶rt;uвшuмся в Нuжнем Егunеmе с сере¶rt;uны 7-го ¶rt;о сере¶rt;uны 15-го векa, явно nо¶rt;чuнены солнечным вaрuaцuям. Эmо свu¶rt;umельсmвуеm о влuянuu Солнцa нa клuмamuческuе uзмененuя в восmочно-aфрuкaнскuх mроnuкaх. Теснaя связь экономuческого u nолumuческого рaзвumuя ¶rt;ревнеегunеmскuх цaрсmв с высоmоŭ рaзлuвов Нuлa обшеnрuзнaнa. Уna¶rt;ок ¶rt;ревнеегunеmскuх цaрсmв u нaсmуnленuе меж¶rt;уцaрсmвuя объясняеmся очень нuзкuм уровнем во¶rt;ы в Нuле u nро¶rt;олжumелбнымu зaсухaмu, зa коmорымu nосле¶rt;овaл жесmкоŭголо¶rt; u рaзрушенuе nолumuческоŭ сmрукmуры. О¶rt;нaко, с nомошбю рa¶rt;uоуглеро¶rt;ных ¶rt;aнных можно обнaружсumь, чmо nо крaŭнеŭ мере nервое u вmорое меж¶rt;уцaрсmвuя совna¶rt;aюm с ¶rt;лumелбнымu мaксuмумaмu солнечноŭ aкmuвносmu, чmо nроmuворечum nоложumелбноŭ корреляцuu, выве¶rt;енноŭ uз более чем восбмuсоmлеmнuх uзмеренuŭ уровня во¶rt;ы в Нuле. Кaжеmся, чmо влuянuе солнечноŭ aкmuвносmu нa вековые uзмененuя клuмama uмееm рaзнообрaзныŭ эnuзо¶rt;uчныŭ хaрaкmер.

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Copyright information

© ACADEMIA, Publishing House of the Czechoslovak Academy of Sciences 1986

Authors and Affiliations

  • Vojtěch Leftus
    • 1
  • J. Tomlain
  • V. Vítek
  1. 1.Astronomical InstituteCzechoslovak Acad. Sci.Ondřejov

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