Lightcurves of 1999 Leonid Impact Flashes on the Moon

Details Lightcurves of 1999 Leonid Impact Flashes on the Moon Lightcurves of 1999 Leonid Impact Flashes on the Moon

Sep 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002icar..159...31y&link_type=abstract

Icarus, Volume 159, Issue 1, p. 31-38.

Astronomy and Astrophysics

Astronomy

21

Scientific paper

Optical flashes observed on the night side of the Moon during the 1999 Leonid meteor shower have attracted the interest of astronomers. These flashes are attributed to high-velocity impacts of Leonid meteoroids on the lunar surface. Here, we report five lunar flashes detected over a 5.8-h observation period centered at 11:25 UT on Nov. 18, 1999, in Japan. The flashes are characterized by an abrupt brightening. Three flashes exhibited afterglows that remained visible for at least 50 ms, which is longer than the duration predicted for radiation from an impact-generated plasma cloud. We show that thermal radiation from hot droplets ejected from the lunar surface during high-velocity impacts could be the cause of the afterglows.

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