Solar Activity in the Past and the Chaotic Behaviour of the Dynamo

Fifteen proxy records of summer temperature in Fennoscandia, Northern Europe and in Yamal and Taymir Peninsulas (Western Siberia) were analyzed for the AD 1700–2000 period. Century-long (70–100 year) and quasi bi-decadal periodicities were found from proxy records representing different parts of Fennoscandia. Decadal variation was revealed in a smaller number of records. Statistically significant correlations were revealed between the timescale-dependent components of temperature variability and solar cycles of Schwabe (~11 year), Hale (~22 year), and Gleissberg (сentury-long) as recorded in solar activity data. Combining the results from our correlation analysis with the evidence of solar-climatic linkages over the Northern Fennoscandia obtained over the past 20 years suggest that there are two possible explanations for the obtained solar-proxy relations: (a) the Sun’s activity actually influences the climate variability in Northern Fennoscandia and in some regions of the Northern Hemisphere albeit the mechanism of such solar-climatic linkages are yet to be detailed; (b) the revealed solar-type periodicities result from natural instability of climate system and, in such a case, the correlations may appear purely by chance. Multiple lines of evidence support the first assumption but we note that the second one cannot be yet rejected. Guidelines for further research to elucidate this question are proposed including the Fisher’s combined probability test in the presence of solar signal in multiple proxy records.

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Evidence for Planetary Forcing of the Cosmic Ray Intensity and Solar Activity Throughout the Past 9400 Years

Coronal Magnetometry ◽

10.1007/978-1-4939-2038-9_34 ◽

2014 ◽

pp. 585-607 ◽

Cited By ~ 1

Author(s):

K. G. McCracken ◽

J. Beer ◽

F. Steinhilber

Keyword(s):

Solar Activity ◽

Cosmic Ray ◽

Cosmic Ray Intensity ◽

The Past

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Some patterns in the development of centers of solar activity, 1962–66

Symposium - International Astronomical Union ◽

10.1017/s0074180900021318 ◽

1968 ◽

Vol 35 ◽

pp. 56-63 ◽

Cited By ~ 6

Author(s):

Helen W. Dodson ◽

E. Ruth Hedeman

Keyword(s):

Solar Activity ◽

Radio Emission ◽

Differential Rotation ◽

Graphical Representation ◽

Past History ◽

The Sun ◽

Active Centers ◽

Opposite Hemisphere ◽

The Past ◽

History Of

A graphical representation of the 66 solar rotations (Carrington) between January 1, 1962 and December 31, 1966 has been prepared. It includes all centers of activity for which the calcium plage attained an area of at least 1000 millionths of the solar hemisphere and/or intensity 3 (McMath scale). In this study the antecedents, descendents, and neighbors of each region can easily be discerned. The work shows clearly that zones of activity, apparently closely related and much larger than single plages existed for long intervals of time. For example, the significant increases in solar activity in February, May, and October of 1965 occurred in a ‘family’ of calcium plages apparently related through similarities of position and strong radio emission.The members of ‘families’ of centers of activity are found at systematically changing longitudes. For some ‘families’ the change of longitude appears to be primarily a consequence of differential rotation; for others, the pattern of formation of active centers dominates.According to the data for 1962–66 a meaningful study of the development of a center of activity may require consideration not only of the past history of the zone of the Sun in which it occurs but also of the zone approximately 180° away on the opposite hemisphere.

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Variations in climate parameters at time intervals from hundreds to tens of millions of years in the past and its relation to solar activity

Journal of Atmospheric and Solar-Terrestrial Physics ◽

10.1016/j.jastp.2010.02.012 ◽

2011 ◽

Vol 73 (2-3) ◽

pp. 388-399 ◽

Cited By ~ 12

Author(s):

O.M. Raspopov ◽

V.A. Dergachev ◽

M.G. Ogurtsov ◽

T. Kolström ◽

H. Jungner ◽

...

Keyword(s):

Solar Activity ◽

Time Intervals ◽

The Past ◽

Climate Parameters

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Solar activity in the past and the problem of solar dynamo

Solar Physics ◽

10.1007/bf00154158 ◽

1990 ◽

Vol 128 (1) ◽

pp. 217-225 ◽

Cited By ~ 3

Author(s):

V. Dermendjiev ◽

Y. Shopov ◽

G. Buyukliev

Keyword(s):

Solar Activity ◽

Solar Dynamo ◽

The Past

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Numerical modeling of the natural and anthropogenic factors influence on the past and future changes in polar, mid-latitude and tropical ozone

10.5194/egusphere-egu2020-20440 ◽

2020 ◽

Author(s):

Sergei Smyshlyaev ◽

Polina Blakitnaya ◽

Maxim Motsakov ◽

Vener Galin

Keyword(s):

Solar Activity ◽

Greenhouse Gases ◽

Climate Model ◽

Middle Atmosphere ◽

Stratospheric Ozone ◽

Stratospheric Aerosol ◽

Anthropogenic Factors ◽

The Past ◽

Ozone Depleting Substances ◽

Natural And Anthropogenic Factors

<p>The INM RAS &#8211; RSHU chemistry-climate model of the lower and middle atmosphere is used to compare the role of natural and anthropogenic factors in the observed and expected variability of stratospheric ozone. Numerical experiments have been carried out on several scenarios of separate and combined effects of solar activity, stratospheric aerosol, sea surface temperature, greenhouse gases, and ozone-depleting substances emissions on ozone for the period from 1979 to 2050. Simulations for the past and present periods are compared to the results of ground-based and satellite observations, as well as MERRA and ERA-Interim re-analysis. Estimation of future ozone changes are based on different scenarios of changes in solar activity and emissions of ozone-depleting substances and greenhouse gases, as well as the possibility of large volcanic aerosol emissions at different periods of time.</p>

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