Transformation of sporadic low-mass meteoroid component into the aerosol of the Earth’s upper atmosphere
|1Kozak, PM, 1Kruchynenko, VG, 2Kruchenitsky, GM, 3Ivchenko, VM, 3Kozak, LV, 3Belokrinitskaya, LM, 1Taranukha, Yu.G, 1Rozhilo, OO |
1Astronomical Observatory of the Taras Shevchenko National University of Kyiv, Kyiv, Ukraine
2Central Aerological Observatory of Roshydromet, Dolgoprudnyj, Russia
3Taras Shevchenko National University of Kyiv, Kyiv, Ukraine
|Kosm. nauka tehnol. 2010, 16 ;(4):13-21|
|Publication Language: Ukrainian|
We consider the problem of the aerosol formation in the upper atmosphere from meteoroids which arrive in the Earth’s atmosphere and have masses from 10-18 to 10-8 g. Based on the analytical solutions of simplified classical equations of deceleration and heating of small meteoroids, we determined the maximal temperatures of the particles during their motions in the atmosphere and the altitudes at which they reach critically low velocities (so-called altitudes of stopping). We suppose that a space particle transforms into an aerosol one when it does not reach its melting temperature. As a base input characteristics, we have plotted the three-dimensional probability density distribution for the number of such particles as a function of the following parameters being critical for reaching by the particle its melting temperature: initial mass, velocity, and angle of entrance into the atmosphere. It is found that stone particles with initial masses less than 1.710-14 g become aerosols independently on other parameters. By means of the transformation of the plotted distribution in accordance with simplified classical meteor physics equations, we derived a two-dimensional distribution over mass and formation altitude for the aerosol of space origin in the upper atmosphere.
|Keywords: aerosol, meteoroids, upper atmosphere|
1. Voloshchuk Iu. I., Kashcheev B. L., Kruchinenko V. G. Meteors and meteoritic matter, 294 p. (Naukova Dumka, Kiev, 1989) [in Russian].
2. Kruchynenko V. G. Influx of space bodies with masses in a wide range on the Earth. Kinematika i Fizika Nebes. Tel, 18 (2), 114—127 (2002) [in Russian].
3. Kruchynenko V. G. Thermal explosions of meteoroids in Earth's atmosphere. Kinematika i Fizika Nebes. Tel, 20 (3), 269—282 (2004) [in Russian].
4. Lebedinets V. N. Dust in the upper atmosphere and cosmic space. Meteors, 250 p. (Gidrometeoizdat, Leningrad, 1980) [in Russian].
5. Lebedinets V. N. Aerosols in the upper atmosphere and cosmic dust, 272 p. (Gidrometeoizdat, Leningrad, 1981) [in Russian].
6. Levin B. Yu. Physical Theory of Meteors and the Meteor Matter in the Solar System, 296 p. (Izd-vo AN SSSR, Moscow, 1956) [in Russian].
7. Fesenkov V. G. The Problem of Micrometeorites. Meteoritika, 12, 3—14 (1955) [in Russian].
8. Brownlee D. E., Hodge P. W. Ablation debris and primary micrometeoroids in the atmosphere. Space Res., 13 (2), 1139—1151 (1973).
9. Ceplecha Z. Influx of interplanetary bodies onto Earth. Astron. and Astrophys., 263, 361—366 (1992).
10. Nady B. Carbonaceous meteorites, 747 p. (Amsterdam, New York, 1975).
11. Öpik E. J. Researches on the physical theory of meteor phenomena. Publ. Obs. Astr. Tartu, 29 (5), 67 p. (1937).
12. Öpik E. J. Interplanetary dust and terrestrial accretion of meteoric matter. Irish Astron. J., 4 (3-4), 84—135 (1956).
13. Öpik E. J. Physics of Meteor Flight in the Atmosphere, 174 p. (Interscience Publ., New York, 1958).
14. Whipple F. L. The theory of micro-meteorites. Part I. In an isothermal atmosphere. Proc. Nat. Acad. Sci. Amer., 36 (12), 686—695 (1950).
15. Whipple F. L. The theory of micro-meteorites. Part II. In heterothermal atmospheres. Proc. Nat. Acad. Sci. Amer., 37 (1), 19—29 (1951).