Download e-book for kindle: Dynamics of Comets and Asteroids and Their Role in Earth by Andrew Glikson (auth.), Shin Yabushita, Jacques Henrard

By Andrew Glikson (auth.), Shin Yabushita, Jacques Henrard (eds.)

ISBN-10: 9048150817

ISBN-13: 9789048150816

ISBN-10: 9401713219

ISBN-13: 9789401713214

The final decade of this century has obvious a renewed curiosity within the dynamics and physics of the small our bodies of the sunlight method, Asteroids, Comets and Meteors. New observational evidences resembling the invention of the Edgeworth-Kuiper belt, sophisticated numerical instruments similar to the symplectic integrators, analytical instruments reminiscent of semi-numerical perturbation algorithms and normally a greater realizing of the dynamics of Hamiltonian structures, a majority of these elements have converged to make attainable and valuable the learn, over long time spans, of those "minor" gadgets. additionally the general public, the media or even a few political assell}blies became conscious that those "minor" items of our planetary environnement may well develop into lethal guns. it seems that they did have a task in Earth background and a task extra ominous than "predicting" defeat (or victory, why not?) to batches of credulous rulers. Remembering what can have occurred to the dinosaurs yet conserving the entire discretion essential to stay away from developing irrational scares, it might probably now not be unwise or inappropriate to enhance our wisdom of the physics and dynamics of those items and to check particularly their interactions with our planet.

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Extra info for Dynamics of Comets and Asteroids and Their Role in Earth History: Proceedings of a Workshop held at the Dynic Astropark ‘Ten-Kyu-Kan’, August 14–18, 1997

Example text

Diameters are given for all of the craters, but for many of them only upper or lower bounds are given for the ages. Some of these have upper limits ofless than a million years. We may thus summarize the data set of Grieve (1993) as follows: (i) there are 141 craters ; (ii) of these, there are 106 craters of known ages and diameters; and (iii) there are 35 craters for which only upper or lower age limits given. As to the probable errors in the given ages, those with small ages have small probable errors, while those with large ages often have large errors.

In order to test the consistency of the extinction data with the galactic models, Rampino and Stothers (1997) recently performed a series of new linear spectral analyses on these data. Using the 11 mass extinctions over the last 250 Myr, we performed the time-series analyses either allowing the phase to be a free parameter, or with fixed phasing, in which case we only used trial starting epochs in the range 0 ± 1 Myr (the time of most recent galactic plane crossing). When the phase is allowed to vary, only one high spectral peak at 27 Myr is apparent.

A) Histogram distribution of geomagnetic reversal frequencies over the past 100 Myr. Data taken from Lowrie & Alvarez(1981). N 174. The dotted line represents the long term trend. (b) The deviation from an exact periodicity, sIP is plotted against period, P. (c) The Cumulative probability distribution of() I P on the null hypothesis of random distribution. = 44 S. 30 Fig. 5. , (1977). , (1977). , (1977). 2 20 30 40 p Fig. 6. The deviation from exact periodicity, sf P is plotted against period P using the extinction rate peaks of Sepkoski(l995).

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Dynamics of Comets and Asteroids and Their Role in Earth History: Proceedings of a Workshop held at the Dynic Astropark ‘Ten-Kyu-Kan’, August 14–18, 1997 by Andrew Glikson (auth.), Shin Yabushita, Jacques Henrard (eds.)


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