Physics
Scientific paper
Oct 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997p%26ss...45.1287m&link_type=abstract
Planetary and Space Science, Volume 45, Issue 10, p. 1287-1298.
Physics
1
Scientific paper
Multicolor Galileo observations of several SL9 impacts permit derivation of size and temperature information for the fireball phase. Integration of lightcurves yields total fireball radiant energy estimates. Event Q1 has an initial color temperature of 24 000 K. Total radiant fireball energy for G was 8.3 × 1024 erg. The largest event, L, is estimated to be 1025 erg. Modelling of total energy radiated during the fallback phase shows a much larger energy release during that period-up to 4 × 1026 erg for L. The mass required to provide the equivalent kinetic energy is about 1 × 1013 g, which is a strong lower limit to initial fragment mass. The fallback energy derived for the R impact is 1 × 1025 erg, with the strongest spectral constraints. Fallback energies for H and Q1 are about 4 × 1025 erg, derived from only two spectral points. The fallback energies extrapolated from the 2.3 μm lightcurves of the G and K impacts are 7 × 1025 and 9 × 1025 erg, respectively. Uncertainties of the fallback energies are up to an order of magnitude. Improvements to these estimates and their uncertainties will derive from the application of more detailed physical models.
Martin Terry. Z.
Orton Glenn S.
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