The «lugo» fireball of January 19, 1993
Tóm tắt
Observational data and the theory of the interaction of meteoroids with the Earth’s atmosphere enable us to characterize the spectacular fireball which was observed to cross Northern Italy from SE to NW on January 19, 1993, ending at about 00∶33 h UT with an explosion approximately over the town of Lugo di Romagna. For estimated visual magnitudesM v=−22⋎−25 at the peak of the light curve corresponding to values of an initial radius of (1.5⋎3) m, a meteor luminosity ranging between 3·1018 and 4·1019 erg/s is obtained, consistent with the radiant flux values obtained by the Stefan-Boltzmann law for a black-body temperature of tens of thousand degrees. The explosion of the bolide produced low-frequency (1.5⋎2) Hz) infrasonic waves which were monitored by a microseismic network of three stations near Ferrara and by regional seismic stations of the ING (Istituto Nazionale di Geofisica) at (20⋎60) km distances from the epicentre located in the stratosphere. The analysis of recovered microremnants nearby the epicentre in the form of spherules of vaporized and recondensed material, outlines the relative importance of light chemical elements typical of soft structures in small Earth-crossing bodies.
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