Statistics – Applications
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008epsc.conf..723g&link_type=abstract
European Planetary Science Congress 2008, Proceedings of the conference held 21-25 September, 2008 in Münster, Germany. Online a
Statistics
Applications
Scientific paper
A problem of determination of terminal mass of meteor bodies is important for correct estimation of the influx of cosmic matter to planets. In turn, these data are widely used in several applications, specifically, in investigation of security from asteroids and comets, in development of planetary defense measures, and in determination of the bodies that can reach Earth's surface. Now we have an opportunity to calculate terminal mass much more precisely than it has been made earlier. So all over again we shall remind that it has been shown in papers (Gritsevich, Stulov, 2006; Gritsevich, 2008) by means of various dynamic approaches that the major part of the luminous segment of the trajectories of large fireballs corresponds to continuous medium flow. Therefore, we can deduce that the fireball brightness under these conditions is mainly due to the emission from air in the compressed shock layer rather than due to the emission from evaporated meteoroid matter which is necessary for the validity of the well-known photometric formula. In other words we should define the terminal mass of a meteor body in these cases strictly by dynamic way. In the present report the terminal mass of large fireballs is calculated using the data of actual observations, by selecting the parameters describing deceleration and ablation of fireballs along the luminous segment of the trajectory. The mathematical model is based on the best fitting of the observational data by an analytical solution of the equations of meteor physics. In doing so, the author tried to take into account all of the peculiarities of the events noted in the literature, as well as the newest results of numerical experiments on the 3D aerodynamics of bodies of complicated shapes. The physical theory presented in the report was applied to the bright fireballs observed by the Canadian camera network (Halliday et al., 1996) and to the several well-known meteoriteproducing fireballs. By results of calculation the 13 large MORP fireballs with terminal mass more than 5 kg are presented. The proximity of results obtained using different dynamic methods implies that observational data on the deceleration and ablation of meteoroids provide objective information on the basic parameters of fireballs and the accompanying physical processes.
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