The explosion of the bolide over Lugo DI Romagna (Italy) on 19 January 1993

Details The explosion of the bolide over Lugo DI Romagna (Italy) on 19 January 1993 The explosion of the bolide over Lugo DI Romagna (Italy) on 19 January 1993

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994p%26ss...42..767c&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 42, no. 9, p. 767-775

Physics

6

Abundance, Atmospheric Heating, Bolides, Explosions, Italy, Black Body Radiation, Energy Dissipation, Light Curve, Meteor Trails, Microseisms

Scientific paper

A spectacular fireball was observed crossing Northern Italy from SE to NW on 19 January 1993, at about 00.33 h UT, ending with an explosion approximately over the city of Lugo di Romagna. Calculations on the fragmentation of the body were performed for an entry velocity of 25 km/s, a low-inclination of about 14-15 deg, and a material strength S = 10-50 MPa (Bronshten, V. A., 1983) valid for stony (and carbonaceous) chondrites, with heights of first fragmentation hbreak is less than or = 35-40 km. For estimated visual magnitudes Mv = -22 to -25 at the peak of the light-curve corresponding to values of an initial radius of 1.5-3 m (Hills, J. K. and Goda, 1993), a meteor luminosity ranging between 300 and 4000 GW is obtained, consistent with the radiant flux values obtained by the Stefan-Boltzmann law for a black-body temperature of tens of thousands 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 horizontal distances from the epicentre located in the stratosphere. Micronanalysis of recovered particles in the explosion zone, in the form of spherules of vaporized and recondensed material, reveals the relative importance of light chemical elements typical of soft structures.

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