Meteor Outburst Profiles and Cometary Ejection Models
- 639 Downloads
The spatial structure of meteor streams, and the activity profiles of their corresponding meteor showers, depend firstly on the distribution of meteoroid orbits soon after ejection from the parent comet nucleus, and secondly on the subsequent dynamical evolution. The latter increases in importance as more time elapses. For younger structures within streams, notably the dust trails that cause sharp meteor outbursts, it is the cometary ejection model (meteoroid production rate as a function of time through the several months of the comet’s perihelion return, and velocity distribution of the meteoroids released) that primarily determines the shape and width of the trail structure. This paper describes how a trail cross section can be calculated once an ejection model has been assumed. Such calculations, if made for a range of ejection model parameters and compared with observed parameters of storms and outbursts, can be used to constrain quantitatively the process of meteoroid ejection from the nucleus, including the mass distribution of ejected meteoroids.
KeywordsCelestial mechanics Comets Dust trails Leonids Meteor outbursts Meteor streams
Unable to display preview. Download preview PDF.
Helpful comments from Dr Peter Brown and Dr Jun-ichi Watanabe are greatly appreciated.
- D.J. Asher, in Dynamics of Populations of Planetary Systems, ed. by Z. Knežević, A. Milani. The dynamical structure of meteor streams and meteor shower predictions. Proc. IAU Colloq. vol. 197 (Cambridge University Press, 2005), pp. 375–382Google Scholar
- R.R. Bate, D.D. Mueller, J.E. White, Fundamentals of Astrodynamics. (Dover Publications, New York, 1971)Google Scholar
- J.M.A. Danby, Fundamentals of Celestial Mechanics, 2nd edn. (Willmann-Bell, Richmond, Virginia, 1988)Google Scholar
- E. Everhart, in Dynamics of Comets: Their Origin and Evolution, ed. by A. Carusi, G.B. Valsecchi. An efficient integrator that uses Gauss-Radau spacings. Proc. IAU Colloq. vol. 83 (Reidel, Dordrecht, 1985), pp. 185–202Google Scholar
- E.D. Kondrat’eva, E.A. Reznikov, Comet Tempel-Tuttle and the Leonid meteor swarm. Sol. Syst. Res. 19, 96–101 (1985)Google Scholar
- E. Lyytinen, Leonid predictions for the years 1999–2007 with the satellite model of comets. Meta Res. Bull. 8, 33–40 (1999)Google Scholar
- M. Müller, S.P. Green, N. McBride, in Proceedings of the Meteoroids 2001 Conference, ed. by B. Warmbein. Constraining cometary ejection models from meteor storm observations, ESA SP–495 (ESA, Noordwijk, 2001), pp. 47–54Google Scholar
- C.D. Murray, S.F. Dermott, Solar System Dynamics (Cambridge University Press, 1999)Google Scholar
- E.A. Reznikov, The Giacobini-Zinner comet and Giacobinid meteor stream. Trudy Kazan. Gor. Astron. Obs. 53, 80–101 (1993) (In Russian)Google Scholar
- J. Watanabe, H. Fukushima, T. Nakamura, in Proceedings of the Meteoroids 2001 Conference, ed. by B. Warmbein. The activity profile of comet 55P/Tempel-Tuttle in 1998 return: meteoroid release concentration on the perihelion, ESA SP–495 (ESA, Noordwijk, 2001), pp. 175–178Google Scholar