Luminous efficiency based on FRIPON meteors

Abstract

In meteor physics the luminous efficiency $\tau$ is used to convert the meteor's magnitude to the corresponding meteoroid's mass. However, lack of sufficiently accurate verification methods or adequate laboratory tests leave this parameter to be controversially discussed. In this work meteor/fireball data obtained by the Fireball Recovery and InterPlanetary Observation Network (FRIPON) was used to calculate the masses of the pre-atmospheric meteoroids which could in turn be compared to the meteor brightnesses to assess their luminous efficiencies. For that, deceleration-based formulas for the mass computation were used. We have found $\tau$-values, as well as the shape change coefficients, of 294 fireballs with determined masses in the range of $10^{-6}$ kg - $100$ kg. The derived $\tau$-values have a median of ${\tau }_{median}$ = 2.17 %. Most of them are on the order of 0.1 % - 10 %. We present how our values were obtained, compare them with data reported in the literature, and discuss several methods. A dependence of $\tau$ on the pre-atmospheric velocity of the meteor, $v_e$, is noticeable with a relation of $\tau =0.0023\cdot v_e^{2.3}$. The higher luminous efficiency of fast meteors could be explained by the higher energy released. Fast meteoroids produce additional emission lines that radiate more efficiently in specific wavelengths due to the appearance of the so-called second component of higher temperature. Furthermore, a dependence of $\tau$ on the initial meteoroid mass, $M_e$, was found, with negative linear behaviour in log-log space: $\tau =0.48\cdot M_e^{-0.47}$. This implies that the radiation of smaller meteoroids is more efficient.

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