Effect of the Tunguska Meteor and Sunspots on Radiocarbon in Tree Rings

  title={Effect of the Tunguska Meteor and Sunspots on Radiocarbon in Tree Rings},
  author={Juan Carlos Lerman and Willem G. Mook and John C. Vogel},
SEVERAL hypotheses have been advanced to explain the peculiar circumstances associated with the fall of the Tunguska Meteor on June 30, 1908, in Siberia (lat. 60° 55′ N., long. 101° 57′ E.). An exhaustive description of the phenomena is given by Krinov1. Especially puzzling is the apparent absence of a meteoric crater, but Krinov2 does report some recent analyses of soil in the region which show iiickeliferous iron and silicate globules. 
Tunguska's comet and non-thermal 14C production in the atmosphere
THE dramatic explosion on 30 June 1908 over Tunguska, Siberia continues to generate a wealth of literature on the supposed mysterious nature of the phenomenon. Hughes1 recently summarised the
Carbon-14 in Patagonian Tree Rings
The radiocarbon activity found in tree rings from southern Argentina shows secular fluctuations which are synchronous with and of the same amplitude as those known for the Northern Hemisphere.
In 1908 a cataclysm occurred in the central Siberian area of Russia. Initial reports described a glowing object in the sky which crashed to the earth and exploded into flames, destroying a large
In this review we consider the time variations of the atmospheric concentration of 14C, a radioisotope induced by cosmic rays and also known as radiocarbon. Radiocarbon dating is well known as the
Radiocarbon variations with the 11-year solar cycle during the last century
As 14C is produced in the atmosphere by interactions between neutrons and nitrogen atoms, changes in the cosmic ray flux associated with the 11-yr solar cycle will produce variations in 14C
Modern aspects of radiocarbon datings
Calibration of radiocarbon dates; tables based on the consensus data of the Workshop on Calibrating the Radiocarbon Time Scale.
A calibration is presented for conventional radiocarbon ages ranging from 10 to 7240 years BP and thus covering a calendric range of 8000 years from 6050 BC to AD 1950. Distinctive features of this


Non-anti-matter Nature of the Tunguska Meteor
THE deduction of Cowan et al.1, from their radiocarbon measurements of tree rings, that the Tunguska meteorite could not have been made of anti-matter has been called into question recently by R. V.
Anti-matter Content of the Tunguska Meteor
COWAN et al.1 have advanced the hypothesis that the 1908 Tunguska meteor explosion resulted from the anti-matter content of the meteorite. Although their analysis indicates a probable upper limit of
Antimatter and Tree Rings
RECENTLY, Cowan, et al.1 discussed the interesting case of the Tunguska meteor—the event and its origin mainly in the context of release of a rather high energy of ∼ 1024 ergs on its impact. Various
Secular variations of the cosmic-ray-produced Carbon 14 in the atmosphere and their interpretations
The carbon 14 content of about 150 wood samples, dated by dendrochronology, has been measured. The wood samples of known age used in this investigation cover the past 2000 years. Some were supplied
On the quantitative relationships between geophysical parameters and the natural C14 inventory
The relationships between observed variations of the specific radiocarbon activity in the atmosphere and possible secular variations in (1) C14 production rate, (2) carbon residence times, and (3)
Production of carbon 14 by cosmic‐ray neutrons
The rate of production of carbon 14 by cosmic-ray neutrons is calculated by multigroup diffusion theory as a function of altitude, latitude, and time, and it is normalized to absolute cosmic-ray
Reduction of atmospheric radiocarbon concentration by fossil fuel carbon dioxide and the mean life of carbon dioxide in the atmosphere
  • G. J. Fergusson
  • Environmental Science
    Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences
  • 1958
It is generally accepted that the combustion of fossil fuels over the period 1860 to 1954 has produced an amount of carbon dioxide, containing no radiocarbon, that is equal to approximately 13% of
The sunspot cycle, 649 B.C. to A.D. 2000
Annual sunspot numbers since 1700 and the known maxima and minima since 1610 show a similarity of pattern from century to century. This suggests that the mean cycle is approximately 11-1/9 years.