A Phenomenological Study of the Cosmic Ray Variations over the Past 9400 Years, and Their Implications Regarding Solar Activity and the Solar Dynamo

Solar Physics ◽  
2013 ◽  
Vol 286 (2) ◽  
pp. 609-627 ◽  
Author(s):  
K. G. McCracken ◽  
J. Beer ◽  
F. Steinhilber ◽  
J. Abreu
Solar Physics ◽  
1990 ◽  
Vol 128 (1) ◽  
pp. 217-225 ◽  
Author(s):  
V. Dermendjiev ◽  
Y. Shopov ◽  
G. Buyukliev
Keyword(s):  

Solar Physics ◽  
2014 ◽  
Vol 289 (8) ◽  
pp. 3207-3229 ◽  
Author(s):  
K. G. McCracken ◽  
J. Beer ◽  
F. Steinhilber

Variations in atmospheric carbon-14 concentrations during the past century have been studied through the analyses of wines, spirits and plant seeds. The results reveal that short-term fluctuations of carbon-14 concentrations have occurred which are negatively correlated with solar activity. Maximum correlation occurs with carbon-14 concentration minima preceding sunspot maxima by one year. The overall magnitude of the fluctuations, 3 % of the natural carbon-14 concentration, appears too large to be attributed to variations in the isotope production rate by solar modulation of the galactic cosmic ray flux. It is proposed that the fluctuations are the result of solar-sensitive mixing of stratospheric and tropospheric air masses through variations of the incident ultraviolet and corpuscular radiation over each solar cycle. Theoretical considerations require that stratospheric carbon-14 levels fluctuate in direct correlation with solar activity. These variations of natural carbon-14 activities in the troposphere represent a significant deviation from the basic assumption of the radiocarbon dating method and may introduce further uncertainty in the dating of ‘young’ materials. In addition, they endorse the universal use of the N. B. S. modern standard in carbon -14 assay. A long-term decrease in tropospheric carbon-14 concentrations was also observed and is attributed to a reduction in the mean production rate of carbon-14 through enhanced solar activity.


Radiocarbon ◽  
1980 ◽  
Vol 22 (2) ◽  
pp. 328-336 ◽  
Author(s):  
V A Dergachev

Some questions in the study of cosmic ray intensity (solar magnetic irregular solar activity, 14CO2, and 14CO in radiocarbon models, etc) on the basis of 14C concentration in the earth's atmosphere are considered.


2001 ◽  
Vol 203 ◽  
pp. 602-605
Author(s):  
E. Pallé Bagó ◽  
C. J. Butler

We analyse the new ISCCP (International Satellite Cloud Climatology Project) D2 cloud data to ascertain whether or not a connection between cosmic ray flux and cloud cover exists. Our results indicate that only the low-level cloud follows solar activity over the full period, 1983-1994. Using several proxies for solar activity and the radiative forcing for the ISCCP cloud types, we estimate the possible impact that such a solar-terrestrial connection may have on climate. We conclude that, possibly excluding the most recent decades, much of the warming of the past century can be quantitatively accounted for by the direct and indirect effects of solar activity.


2021 ◽  
Vol 13 (7) ◽  
pp. 4022
Author(s):  
Pernilla Gluch ◽  
Stina Månsson

Over the past two decades, sustainability professionals have entered the architecture, engineering, and construction (AEC) industry. However, little attention has been given to the actual professionalization processes of these and the leadership conducted by them when shaping the pace and direction for sustainable development. With the aim to explore how the role of sustainability professionals develops, critical events affecting everyday sustainability work practices were identified. Based on a phenomenological study with focus on eight experienced environmental managers’ life stories, and by applying the theoretical lens of institutional entrepreneurship, the study displays a professionalization process in six episodes. Different critical events both enabled and disabled environmental managers’ opportunity to engage in institutional entrepreneurship. The findings indicate how agency is closely interrelated to temporary discourses in society; they either serve to support change and create new institutional practices towards enhanced sustainability or disrupt change when agency to act is temporarily “lost”. To manage a continually changing environment, environmental managers adopt different strategies depending on the situated context and time, such as finding ambassadors and interorganizational allies, mobilizing resources, creating organizational structures, and repositioning themselves.


2021 ◽  
Author(s):  
Kseniia Golubenko ◽  
Eugene Rozanov ◽  
Genady Kovaltsov ◽  
Ari-Pekka Leppänen ◽  
Ilya Usoskin

<p>We present the first results of modelling of the short-living cosmogenic isotope <sup>7</sup>Be production, deposition, and transport using the chemistry-climate model SOCOLv<sub>3.0</sub> aimed to study solar-terrestrial interactions and climate changes. We implemented an interactive deposition scheme,  based on gas tracers with and without nudging to the known meteorological fields. Production of <sup>7</sup>Be was modelled using the 3D time-dependent Cosmic Ray induced Atmospheric Cascade (CRAC) model. The simulations were compared with the real concentrations (activity) and depositions measurements of <sup>7</sup>Be in the air and water at Finnish stations. We have successfully reproduced and estimated the variability of the cosmogenic isotope <sup>7</sup>Be produced by the galactic cosmic rays (GCR) on time scales longer than about a month, for the period of 2002–2008. The agreement between the modelled and measured data is very good (within 12%) providing a solid validation for the ability of the SOCOL CCM to reliably model production, transport, and deposition of cosmogenic isotopes, which is needed for precise studies of cosmic-ray variability in the past. </p>


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