Author: J. O. GoldenPublisher:
ISBN:
Category : Tektite
Languages : en
Pages : 186
Book Description
Surface Effects Resulting from Tektite Ablation
Author: J. O. GoldenPublisher:
ISBN:
Category : Tektite
Languages : en
Pages : 186
Book Description
Scientific and Technical Aerospace Reports
Author: Tektites and Their Origin
Author: John Aloysius O'KeefePublisher: Elsevier Science & Technology
ISBN:
Category : Nature
Languages : en
Pages : 276
Book Description
Effect on Meteor Flight of Cooling by Radiation and Ablation
Author: H. Julian AllenPublisher:
ISBN:
Category : Ablation (Aerothermodynamics)
Languages : en
Pages : 68
Book Description
Aerodynamic Analysis of Tektites and Their Parent Bodies
Author: E. W. AdamsPublisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 52
Book Description
Experiment and analysis indicate that the button-type australites were derived from glassy spheres which entered or re-entered the atmosphere as cold solid bodies; in case of average-size specimens, the entry direction was nearly horizontal and the entry speed between 6.5 and 11.2 km/sec. Terrestrial origin of such spheres is impossible because of extremely high deceleration rates at low altitudes. The limited extension of the strewn fields rules out extraterrestrial origin of clusters of such spheres because of stability considerations for clusters in space. However, tektites may have been released as liquid droplets from glassy parent bodies ablating in the atmosphere of the earth. The australites then have skipped together with the parent body in order to re-enter as cold spheres. Terrestrial origin of a parent body would require an extremely violent natural event. Ablation analysis shows that fusion of opaque siliceous stone into glass by aerodynamic heating is impossible.
NASA Technical Note
Author: Aerodynamic Evidence Pertaining to the Entry of Tektites Into the Earth's Atmosphere
Author: Dean R. ChapmanPublisher:
ISBN:
Category : Ablation (Aerothermodynamics)
Languages : en
Pages : 36
Book Description
Evidence is presented which shows that the Australian and Java tektites entered the earth's atmosphere and experienced ablation by severe aerodynamic heating in hypervelocity flight. The laboratory experiments on hypervelocity ablation have reproduced ring-wave flow ridges and coiled circumferential flanges like those found on certain of these tektites. Systematic striae distortions exhibited in a thin layer beneath the front surface of australites also are reproduced in the laboratory ablation experiments, and are shown to correspond to the calculated distortions for aerodynamic ablation of a glass. About 98 percent of Australian tektites represent aerodynamically stable configurations during the ablative portion of an entry trajectory. Certain meteorites exhibit surface features similar to those on tektites.
Advances in Geophysics
Author: Publisher: Academic Press
ISBN: 0080568394
Category : Science
Languages : en
Pages : 362
Book Description
Advances in Geophysics
Bibliography of Lunar and Planetay Research
Author: AFOSR.
Author: United States. Air Force. Office of Scientific ResearchPublisher:
ISBN:
Category : Research
Languages : en
Pages : 1136
Book Description