Diffuse structure of some meteors at the beginning of their trajectories at classic heights

1Kozak, PM
1Astronomical Observatory of Taras Shevchenko National University of Kyiv, Kyiv, Ukraine
Kinemat. fiz. nebesnyh tel (Online) 2019, 35(6):62-79
Start Page: Dynamics and Physics of Bodies of the Solar System
Language: Russian

The problem of anomalous meteors with diffuse view and increased size of their comas at the beginning of radiation is considered. Results of processing of some such meteors detected with high-sensitive observational TV systems of superisocon type during Leonid 2002 storm observations are given. In opposite to similar cases described in literature earlier the given meteors had the increased is size diffuse structure of meteor coma not at extrahigh altitudes, but below 128 km: 118.06 ± 0.07 km, 123.01 ± 0.02 km, 124.45 ± 0.10 km. At the trajectory beginning their absolute astronomical magnitudes were varying in the range of +6m.. .+5m, and in maximum of brightness they reached -0.5m. The range of their masses was 0.03...0.06 g. The influence of working mode of TV system onto possible appearance of artifacts is considered. While the transparent, diffuse view of limiting low-light meteor image can be a result of low signal-to-noise ratio, the increasing of spatial size of meteor coma cannot be explained by technical artifacts. Separation of some extremely low-light meteor images in start frames onto a range of individual point objects placed inside a zone 0.5...1.5 km can serve as an indirect argument of real fragmentation of an initial particle. The conclusion about possible fragmentation of some meteoroids from Leonid stream during time period of two-three weeks before collision with earth with velocities of fragment separation about millimeters a second is drawn.

Keywords: anomalous meteors, diffuse meteor structure, fragmentation, meteors, TV observations

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