Other
Scientific paper
Nov 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999m%26ps...34..959j&link_type=abstract
Meteoritics & Planetary Science, vol. 34, no. 6, pp. 959-968 (1999).
Other
21
Scientific paper
Video observations of the Leonid shower aboard two aircraft in the 1998 Leonid Multi-Instrument Aircraft Campaign and from ground locations in China are presented. Observing at altitude proved particularly effective, with four times higher rates due to low extinction and low angular velocity at the horizon. The rates derived from a total of 2500 Leonids trace at least two distinct dust components. One dominated the night of Nov. 16/17. This two-day wide component was rich in bright meteors with r = N(m+1)/N(m) ~ 1.5 (s = 1.4), and peaked at an influx of 3.1deg0.4 x 10-12 m-2 s-1 (for particles of mass < 7x10-5 gram) at solar longitude ?o ~ 234.52 (Eq. J2000). The other more narrow component peaked on Nov. 17/18, at ?o = 235.31deg0.01. Rates were elevated above the broad component between ?o = 235.15 and 235.40, symmetric around the current node of the parent comet 55P/Tempel-Tuttle, peaking at 5.1deg0.2 x 10-12 m-2 s-1. The population index was higher, r = 1.8deg0.1 (s = 1.7), but not as high as in past Leonid storms (r = 3.0). The flux profile of this component has an unusual asymmetric shape, which implies a blend of contributions from at least two different but relatively recent epochs of ejection. The variation of r across the profile might be due to mass-dependent ejection velocities of the narrowest component. High rates of faint meteors occurred only in an isolated 5-minute interval at ?o = 235.198, which is likely the result of a single meteoroid breakup in space.
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