Meteoroid ejection velocities deduced from a study of the April Lyrid meteor shower

Details Meteoroid ejection velocities deduced from a study of the April Lyrid meteor shower Meteoroid ejection velocities deduced from a study of the April Lyrid meteor shower

Jan 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002mnras.329..175a&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 329, Issue 1, pp. 175-180.

Astronomy and Astrophysics

Astronomy

7

Methods: Numerical, Celestial Mechanics, Meteors, Meteoroids

Scientific paper

The use of meteor shower observations to determine the probable ejection velocity of the stream meteoroids from the parent body depends on the identification of some characteristic of the shower that is very sensitive to the ejection velocity. The April Lyrid meteor shower occasionally produces spectacular displays with rates exceeding 600 meteors per hour, as opposed to the usual rate of no more than 5-10 meteors per hour. These outbursts occur with an apparent 12-yr periodicity. Arter & Williams have postulated that this is caused by an interplay between the ejection velocity (which determines the initial orbit) and gravitational perturbations from Jupiter. This produces a structure for the stream as a whole that can be described as a hollow tube with a cross-section on to the ecliptic in the form of an elliptical ring. Individual meteoroids follow a single strand along the surface of this tube and arrive at the ecliptic at slightly different times, there being a periodicity of 12yr in the arrival times. Generation of this pattern is very sensitive to ejection velocity, and this paper investigates the range of ejection velocities over which this behaviour exists and thus, by inference, deduces the ejection velocity of the meteoroids.

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