New aspects in single-body meteor physics

Astronomy and Astrophysics – Astronomy

Scientific paper

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41

Ablation, Atmospheric Entry, Meteor Trails, Meteoroids, Deceleration, Equations Of Motion, Least Squares Method, Luminosity, Trajectories

Scientific paper

An exact analytical solution of the atmospheric meteoroid single-body problem is presented expressing the distance along the trajectory as a function of time, which yields a least-square fit of the observed trajectory, and analytical expressions for the velocity at the point of maximum deceleration are derived. These results are used to determine the ablation coefficient from observations. These methods are applied to 17 Prairie Network fireballs observed below the maximum deceleration point and to the Innisfree fireball, and the results are found to be superior to the ones obtained with the usual interpolation formula. A model of luminous efficiencies for small velocities and for masses up to several hundred grams based on data on Innisfree and on artificial rocketry meteors is proposed and applied to separate the shape-density coefficient from the meteoroid mass.

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