Nature and destruction of the Tunguska cosmical body

Бронштен, В. А.

doi:10.1016/s0032-0633(00)00028-3

Cited by 29 publications

(23 citation statements)

References 22 publications

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“…The present results do not contradict this conclusion. At the same time, the results of recent theoretical calculations give evidence in favor of both the comet (Bronshten, 2000) and asteroid (Farinella et al, 2001) hypotheses. This distinction has lost its sharpness after the recent discovery of asteroids that behave like comets and comets that behave like asteroids and the double designation of some of these objects (Yeomans, 2000).…”

Section: Carbonmentioning

confidence: 93%

“…As it is known, the TCB mass was high, most probably two million tons (Bronshten, 2000). If the TCB was an ordinary carbonaceous chondrite then there was a high input of the iridium within the explosion area.…”

Section: Carbonmentioning

confidence: 99%

“…A number of publications favor the TCB being the core of a small comet (see, for example, review of Bronshten, 2000), which represents, as is known, a frozen dirty ice conglomerate composed mostly of volatile compounds of H, C, N, and O. However, the same elements are abundant in soils and plants; therefore, it is very difficult to detect the effects of comet material precipitation on the Earth.…”

Section: Introductionmentioning

confidence: 99%

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Isotopic–geochemical study of nitrogen and carbon in peat from the Tunguska Cosmic Body explosion site

Kolesnikov

Longo

Boettger

et al. 2003

Icarus

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Isotopic-geochemical investigations were carried out on peat samples from the 1908 Tunguska Cosmic Body (TCB) explosion area. We analyzed two peat columns from the Northern peat bog, sampled in 1998, and from the Raketka peat bog, sampled during the 1999 Italian expedition, both located near the epicenter of the TCB explosion area. At the depth of the "catastrophic" layer, formed in 1908, and deeper, one can observe shifts in the isotopic composition of nitrogen (up to ⌬ 15 N ϭ ϩ7.2‰) and carbon (up to ⌬ 13 C ϭ ϩ2‰) and also an increase in the nitrogen concentration compared to those in the normal, upper layers, unaffected by the Tunguska event. One possible explanation for these effects could be the presence of nitrogen and carbon from TCB material and from acid rains, following the TCB explosion, in the "catastrophic" and "precatastrophic" layers of peat. We found that the highest quantity of isotopically heavy nitrogen fell near the explosion epicenter and along the TCB trajectory. It is calculated that 200,000 tons of nitrogen fell over the area of devastated forest, i.e., only about 30% of the value calculated by Rasmussen et al. (1984). This discrepancy is probably caused by part of the nitrogen having dispersed in the Earth's atmosphere. The isotopic effects observed in the peat agree with the results of previous investigations (Kolesnikov et al., 1998a(Kolesnikov et al., , 1998bRasmussen et al., 1999) and also with the increased content of iridium and other platinoids found in the corresponding peat layers of other columns (Hou et al., 1998(Hou et al., , 2000. These data favor the hypothesis of a cosmochemical origin of the isotopic effects.

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Section: Carbonmentioning

confidence: 93%

Section: Carbonmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Isotopic–geochemical study of nitrogen and carbon in peat from the Tunguska Cosmic Body explosion site

Kolesnikov

Longo

Boettger

et al. 2003

Icarus

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“…This consideration can also be related to the general problem of cometary-asteroid hazard [24]. In this analysis the hypothesis of the meteorite nature of the Tunguska object is followed [24].…”

Section: Tunguska Meteorite Impact Problemmentioning

confidence: 99%

“…[16 -25]). In particular, the nature of the Tunguska meteorite is the subject of intensive discussions [16,18,20,22,24]. The Tunguska impact caused vast destruction of the forest in the area of about 10 8 m 2 and was accompanied by explosion-like phenomena.…”

Section: Introductionmentioning

confidence: 99%

An adaptive moving mesh method with application to non-stationary hypersonic flows in the atmosphere

Utyuzhnikov¹,

Rudenko

2008

Proceedings of the Institution of Mechanical Engineers, Part G:

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A numerical algorithm based on a shock-capturing scheme on adaptive moving meshes is described. Three-dimensional dynamical adaptive meshes are generated as the result of solving a variational problem. The governing equations are solved in a moving coordinate system therefore the method does not require any interpolation of the solution from one mesh onto another one. The developed algorithm can efficiently be used for the simulation of non-stationary supersonic flows in the atmosphere. As an example, it is applied to the study of the Tunguska meteorite hypersonic impact. For the first time this problem is modelled from the entrance moment up to the interaction with the Earth atmosphere in a three-dimensional formulation. A reasonable correspondence with the data of the observations is obtained. The implementation of the developed numerical algorithm reduces the computational time by the factor of four.

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