Classical Meteor Light Curve Morphology |
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Authors: | Martin Beech Megan Hargrove |
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Institution: | (1) Campion College, The University of Regina, Regina, S4S 0A2, SK, Canada;(2) The Department of Physics, The University of Regina, Regina, S4S 0A2, SK, Canada |
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Abstract: | We investigate the morphological variation of classical meteor light curves, under the constant velocity assumption, for a
series of idealized atmospheric density profiles. We look specifically at the t
rise
/t
fall
ratio, which compares the rise time to maximum brightness against the time to fall from maximum brightness. We demonstrate
that for a classical meteoroid undergoing rapid ablation in an isothermal atmosphere that t
rise/t
fall > 1, indicating that all such light curves are late peaked. For a classical meteoroid ablating in a region over which the
density is constant, t
rise/t
fall≡ 0, and the light curve is necessarily downward concave in the height vs. intensity diagram. If ablation occurs over a region
in which the density increases linearly with decreasing height, then t
rise/t
fall=1/(√5 – 1) ≈ 0.81, indicative of an early peaked, near symmetric light curve. |
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Keywords: | Ablation atmospheres meteoroids |
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