Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999stin...0012163n&link_type=abstract
Technical Report, AD-A370326; AOARD-98-4008 Information Processing Center
Astronomy and Astrophysics
Astronomy
Leonid Meteoroids, Astronomy, Zenith, Sky Brightness, Meteoroid Showers, Luminescence, Background Radiation, Albedo, Solar Radiation, Cosmic Dust, Zodiacal Light, Astronomical Photometry
Scientific paper
A meteoric cloud is a faint glow of sunlight scattered by the small meteoroids in the trail along a parent comets orbit. Here we report the first detection of the meteoric cloud associated with the Leonid meteor stream. Our photometric observations, performed on Mauna Kea, Hawaii, reveal the cloud as a local enhancement in sky brightness during the meteor shower in 1998. The radius of the trail, deduced from the spatial extent of the cloud, is approximately 0.01 astronomical unit and is consistent with the duration of the meteor stream activities. The brightness of the cloud is approximately 2-3 percent of the background zodiacal light and cannot be explained by the simple model calculations based on the zenith hourly rate and population index of the meteor stream activities in 1998. If the typical size of the cloud particles in 10 urn and the albedo is 0.1,the brightness is transformed into a number density of 1.5e.16/cm3.
Fujii Yasunori
Ishiguro Masateru
Morishige Kazumasa
Nakamura Riou
Yokogawa Sozo
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