Moving of a blunt body through the dense atmosphere under conditions of severe aerodynamic heating and ablation

Biberman, L. M.; Bronin, S. Ya.; Brykin, M. V.

doi:10.1016/0094-5765(80)90116-2

Cited by 40 publications

(13 citation statements)

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“…The essential reason for this decline is that ablation of large objects occurs mainly through absorption of thermal radiation emitted by the hot, shocked gases concentrated in front of the impactor. The temperature attained by the shocked gas is strongly regulated by thermM ionization to a value of the order of 30,000 K [Tauber and Kirk, 1976;Biberman et al, 1980]. This will be roughly the same for Venus and Earth.…”

Section: Ablationmentioning

confidence: 99%

“…This altitude range includes most visible meteors. But near the surface A is expected to vary inversely with atmospheric density, reaching values as low as ~0.002 at the surface [Biberman et al, 1980]. The essential reason for this decline is that ablation of large objects occurs mainly through absorption of thermal radiation emitted by the hot, shocked gases concentrated in front of the impactor.…”

Section: Ablationmentioning

confidence: 99%

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Airburst origin of dark shadows on Venus

Zahnle

1992

J. Geophys. Res.

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A simple analytic model for the catastrophic disruption and deceleration of impactors in a thick atmosphere is used to (1) reproduce observed Venusian cratering statistics and (2) generate radar-dark disks by the impact of atmospheric shock waves with the surface. When used as input to Monte Carlo simulations of Venusian cratering, the model nicely reproduces the observed low diameter cutoff. Venusian craters are found to be more consistent with an asteroidal rather than a cometary source. The radar-dark "shadows" of the title are surface features, usually circular, that have been attributed to airbursting impactors. A typical craterless airburst is the equivalent of a approximately 10(6) megaton explosion. The airburst is treated as a massive, extended explosion using a thin-shell, isobaric cavity approximation. The strong atmospheric shock waves excited by the airbust are then coupled to surface rock using the usual impedance matching conditions. Peak shock pressures experienced by surface rock typically exceed 0.2 GPa for distances 15-30 km from ground zero (the place on the surface immediately beneath the site of the airburst), and 1 GPa for 10-20 km. These high shock pressures are felt to considerable depth, often more than a kilometer. Beneath the airburst the shock could reduce surface rocks to fine rubble, while at greater distance the weaker shock would leave fields of broken blocks, perhaps in part accounting for radar-bright halos that often surround the dark shadows.

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Section: Ablationmentioning

confidence: 99%

Section: Ablationmentioning

confidence: 99%

Airburst origin of dark shadows on Venus

Zahnle

1992

J. Geophys. Res.

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“…For the isothermal atmosphere the ratio of air temperature and mean molecular weight is constant (see (1)), then we have h = H = const according to (1) and (3). It is worth mentioning here the scale height variation is mainly due to the temperature change with height, while the air molecular weight varies insignificantly in the height interval of interest (0-120 km).…”

Section: The Atmospherementioning

confidence: 99%

“…There are several works that attempt to consider these parameters as being not compulsory constants (e.g. [2][3][4]). But in the majority of models, which focus on the problem of the meteoroids fragmentation these values are treated as being constant [5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%