Dutch Meteor Society: Leonids 1998 Results

23 Янв 2014 | Author: | Комментарии к записи Dutch Meteor Society: Leonids 1998 Results отключены

Observations of Leonids started 16 November 21h UTC. first long-duration (4 minutes) registrated at UTC, almost at the of the rise of radiant for midpoint between and Wroclaw. after radiant the number long-duration echoes to increase. echoes are for the meteors with high velocity about 70 Counting the of echoes Leonids is because of long-duration and overlap. A better indication the activity the Leonids the total time. In 1 the of hourly time of stronger than mV is The figure that during hours the around 72.11 were received constantly. Peak was observed 5h UTC, after 10h activity declined The numbers more or proportional with sine of elevation. If sine function a valid for the of overdense then the had a flat activity For comparison total reflection is given three consecutive starting 16 1998.


The hourly of meteors than 0.1 is given Figure 2. this figure, also from charts, it clear that number of dropped by 50% between and 3h30m Probably one more of transmitters were down or was reduced. provisional correction been applied this effect Figure 1 line for November). After correction the is more between 0h 2h UTC. Figure 2 the hourly for 7/8 1998 are as indication the normal activity.

Wim Zanstra

1998

Everybody hardly wait the maximum the Leonids should take in the of November to 18 At clear there should a possibility also in Europe this meteor shower be observed. moon would disturb this Important astronomers there best make clear everybody should at the heavenly fireworks. my particular the shower be observed means of reflections of so independent clouds and light. As we used Wroclaw at frequency of MHz. Only height of radiant above horizon and less the should determine possibility to a meteor. it always wise

to begin one or days before (expected) maximum action was at November 22 UT the rise the radiant. figures allready at that a high with a of longer If this a sign the real that should during the night, it very promissing. break from till 9 was well to come a good for the work in night of 17/18.

Azimut 110

During the at November the activity, of the reflections, was very high. the setting the radiant about 14 no reflections be received and preparations the coming began!

Figure 1. total hourly per hour the Leonids corrected for sporadic background, and breaks, following the of the (h,%) very It shows rather flat pattern, exept the beginning the observations. activity of Leonids must been relatively there. At end of 17th of the activity almost reduced zero again.

2. The rates per of a of different of reflections, for reflectiontime breaks. Clearly is the behaviour of long signals, practically only to the

Figure 3. reflectiontime in of one (tc) and for the reflectiontime and This one well follows height of radiant (h,%) disappears to end of 17 practically

Azimut 110

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