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Astron. Astrophys. 357, 777-781 (2000)

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1. Introduction

A high activity of the Leonid meteor stream is regularly observed on a 32-33-year cycle. Its 1998 display was of prime interest and a highlite event of the year. The observations were carried out using all possible methods including TV technique placed on the aircraft (Jenniskens & Butow 1998). Special expeditions for ground-based observations were operating in Mongolia (Rendtel & Molau 1999). The results from these campaigns were completed by visual (Arlt 1998), optical, TV, radio and radar observations from many locations all over the world. The results are still being analyzed. They will be used for the organization of observational campaigns in the forthcoming years. Some parameters of the stream associated with the return of parent comet 55P/Tempel-Tuttle in 1998 show different characteristics in contrast with previous activity in the nineteen sixties.

The Leonids observed by radar in 1957-1968 at The Springhill Meteor Observatory near Ottawa were discussed by McIntosh & Millman (1970). Ondejov radar Leonids observations 1965-1967, partially published by Plavcová (1968), and by Brown et al. (1997) were reexamined to obtain comparable parameters of the stream with those from the present Leonid campaign monitored by the same meteor radar parameters of which were maintained identical since its installation in 1958.

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© European Southern Observatory (ESO) 2000

Online publication: June 5, 2000