Chris Steyaert - International Meteor Organization
Chris Steyaert - International Meteor Organization
Chris Steyaert - International Meteor Organization
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Combined determination of stream activity<br />
and Observability Function<br />
<strong>Chris</strong> <strong>Steyaert</strong><br />
steyaert@vvs.be
One year of radio meteor counts<br />
• VVS beacon observers<br />
• Sporadics versus streams<br />
• Reliable ?<br />
Armagh september 2010 VVS <strong>Chris</strong> <strong>Steyaert</strong><br />
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IMC2005 presentation<br />
Gaspard De Wilde Perseids 2005<br />
Armagh september 2010 VVS <strong>Chris</strong> <strong>Steyaert</strong><br />
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Reference<br />
• A numerical method to aid in the combined<br />
determination of stream activity and Observability<br />
Function<br />
<strong>Steyaert</strong>, <strong>Chris</strong>tian; Brower, Jeffrey; Verbelen, Felix<br />
WGN, Journal of the <strong>International</strong> <strong>Meteor</strong> <strong>Organization</strong>,<br />
vol. 34, no. 3, p. 87-93<br />
Метод Стиерта<br />
Предложенный метод анализа данных любительских радионаблюдений<br />
метеорных потоков был предложен Кристианом Стиертом (<strong>Chris</strong>tian <strong>Steyaert</strong>)<br />
в 2005 году на Международной метеорной конференции в Оостмале<br />
(Oostmall), Бельгия, и детально описан в статье [*<strong>Chris</strong>tian <strong>Steyaert</strong>, Jeffrey<br />
Brower, and Felix Verbelen, WGN, the Journal of the IMO 34:3 (2006)*].<br />
Рассмотрим суть этого метода.<br />
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Some maths<br />
O<br />
S<br />
Z<br />
OF<br />
t M<br />
a<br />
b<br />
observed ‘activity’<br />
sporadic background<br />
stream profile<br />
Observability Function<br />
instance of maximum<br />
rise time constant<br />
decay<br />
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Geminids 2005<br />
Brower<br />
Verbelen<br />
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Geminids 2005<br />
Observed =<br />
Sporadic + Stream * ObsF<br />
Armagh september 2010 VVS <strong>Chris</strong> <strong>Steyaert</strong><br />
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Geminids 2005<br />
Obs F<br />
Sporadic<br />
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Geminids predictions<br />
Armagh september 2010 VVS <strong>Chris</strong> <strong>Steyaert</strong><br />
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Geminids 2005-2009<br />
Observed =<br />
Sporadic + Stream * ObsF<br />
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Geminids 2005-2009<br />
Avg OF 5 years Geminids<br />
Verbelen<br />
160<br />
140<br />
120<br />
100<br />
80<br />
60<br />
40<br />
20<br />
0<br />
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23<br />
Avg Sporadics 5 years Geminids<br />
Verbelen<br />
10<br />
5<br />
0<br />
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23<br />
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Observed<br />
versus true<br />
maximum<br />
Armagh september 2010 VVS <strong>Chris</strong> <strong>Steyaert</strong><br />
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Conclusions / the future<br />
• Combined stream and OF method works<br />
– well in the easiest case: major stream, one maximum<br />
– not as good in the other cases<br />
• Solutions / possibilities<br />
– re-utilise the determined OF values of each stream per<br />
observer<br />
– combine observations of several observers<br />
• non analytical method<br />
• Growing network<br />
– AI, esp. neural networks<br />
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Thanks to<br />
• Felix Verbelen<br />
• David Entwistle<br />
• Willy Camps<br />
• Jeff Brower<br />
• Astrolab IRIS, Zillebeke<br />
• VVS<br />
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