Physical properties of the meteoroids using simultaneous radar and optical observationsOPEN ACCESS
Mirhusen Narziev
Planetary and Space Science
In Press, Accepted Manuscript, Available online 7 December 2018
“The calculation results of photographic and radar meteoroid mass of simultaneous radio – TV and radio-photographic observations of meteors in 1977-1980 in Hissar Astronomical Observatory of the Institute of Astrophysics, Academy of Sciences of Tajikistan. The analyses0 results of the shape of light curves of meteors within the theory of evaporation and
the theory of the quasi-continuous fragmentation are presented. The photographic meteoroid mass from the light curve were defined: a) by the value of maximum luminous intensity
at a height hm and b) by the integration light curve. Based on analysis of the data of the photographic mass were obtained correction factor that takes into account the effect of fragmentation and other factors to determine the mass of meteoroids first method. Average value of the mass of meteoroids calculated from the light curve for meteors with
magnitude M ≤ 1 is 19 ∗ 10−3 g, and the average value of the mass found on magnitude of the luminous intensity at the height the maximum brightness consist 18.2 ∗ 10−3 g, that is in satisfactory agreement between. Masses of the meteoroids was calculated also radio method by value of maximum linear electron density at the height of maximum ionization. In the framework of the classical theory and the theory quasi-continuous fragmentation, we analyzed the shape of the light curves of simultaneous radio – optical meteors. It is shown that the main mechanism of ablation approximately 60% of simultaneous radio – optical meteors is a quasi-continuous fragmentation. The bulk density and porosity of showers and sporadic meteoroids were determined. Found that the Geminids meteoroids and S.δ-Aquariids have the largest bulk densities (δ0 = 3.6g/cm3 ), and have not porosity (K = 0). A meteoroids of the showers Orionids and Leonids have the lowest bulk density (δ0 ≤ 0.6g/cm3 ), and the highest value of the porosity (60 ≤ K ≤ 80%). The mass fragments of shower and sporadic meteoroids lie in the range of 5 ∗ 10−8 ÷ 10−5 g.”
