Chris Steyaert - International Meteor Organization

imo.net

Chris Steyaert - International Meteor Organization

Combined determination of stream activity

and Observability Function

Chris Steyaert

steyaert@vvs.be


One year of radio meteor counts

• VVS beacon observers

• Sporadics versus streams

• Reliable ?

Armagh september 2010 VVS Chris Steyaert

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IMC2005 presentation

Gaspard De Wilde Perseids 2005

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Reference

• A numerical method to aid in the combined

determination of stream activity and Observability

Function

Steyaert, Christian; Brower, Jeffrey; Verbelen, Felix

WGN, Journal of the International Meteor Organization,

vol. 34, no. 3, p. 87-93

Метод Стиерта

Предложенный метод анализа данных любительских радионаблюдений

метеорных потоков был предложен Кристианом Стиертом (Christian Steyaert)

в 2005 году на Международной метеорной конференции в Оостмале

(Oostmall), Бельгия, и детально описан в статье [*Christian Steyaert, Jeffrey

Brower, and Felix Verbelen, WGN, the Journal of the IMO 34:3 (2006)*].

Рассмотрим суть этого метода.

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Some maths

O

S

Z

OF

t M

a

b

observed ‘activity’

sporadic background

stream profile

Observability Function

instance of maximum

rise time constant

decay

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Geminids 2005

Brower

Verbelen

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Geminids 2005

Observed =

Sporadic + Stream * ObsF

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Geminids 2005

Obs F

Sporadic

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Geminids predictions

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Geminids 2005-2009

Observed =

Sporadic + Stream * ObsF

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Geminids 2005-2009

Avg OF 5 years Geminids

Verbelen

160

140

120

100

80

60

40

20

0

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23

Avg Sporadics 5 years Geminids

Verbelen

10

5

0

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23

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Observed

versus true

maximum

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Conclusions / the future

• Combined stream and OF method works

– well in the easiest case: major stream, one maximum

– not as good in the other cases

• Solutions / possibilities

– re-utilise the determined OF values of each stream per

observer

– combine observations of several observers

• non analytical method

• Growing network

– AI, esp. neural networks

Armagh september 2010 VVS Chris Steyaert

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Thanks to

• Felix Verbelen

• David Entwistle

• Willy Camps

• Jeff Brower

• Astrolab IRIS, Zillebeke

• VVS

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