Chris Steyaert: A Journey in Meteor-Related Activities

Chris Steyaert began his meteor-related activities in the VVS in the 1970s and has since been actively involved in various projects, including photographic campaigns, radio work, and contributing to the International Meteor Organization. His work focuses on stream activity determination and the Observability Function, with notable contributions in the field over the years.

• Chris Steyaert
• Meteor Activities
• VVS
• Observability Function
• International Meteor Organization

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1. Introduction Chris Steyaert started meteor related activities in the VVS 1973 1978, 1980: photographic campaigns in Switzerland radio work from mid 80 s ( East block FM) Founding IMO member RMOB text 1993 RMOB web site 2000 (Pierre Terrier) VVS meteor beacon 2005 (inspired on the Japanese beacon) Re-attending the IMC s since 2010 IMO radio commission director 2021, following up J-L. Rault

2. Combined determination of stream activity and Observability Function Chris Steyaert steyaert@vvs.be

3. 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 (Christian Steyaert) 2005 (Oostmall), , [*Christian Steyaert, Jeffrey Brower, and Felix Verbelen, WGN, the Journal of the IMO 34:3 (2006)*]. . Armagh september 2010 VVS Chris Steyaert 3

4. Some maths O S Z OF tM a b observed activity sporadic background stream profile Observability Function instance of maximum rise time constant decay Armagh september 2010 VVS Chris Steyaert 4

5. Geminids 2005 Brower Verbelen Armagh september 2010 VVS Chris Steyaert 5

6. Geminids 2005 Observed = Sporadic + Stream * ObsF Armagh september 2010 VVS Chris Steyaert 6

7. Geminids 2005 Obs F Sporadic Armagh september 2010 VVS Chris Steyaert 7

8. Geminids predictions Armagh september 2010 VVS Chris Steyaert 8

9. Geminids 2005-2009 Observed = Sporadic + Stream * ObsF Armagh september 2010 VVS Chris Steyaert 9

10. 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 Armagh september 2010 VVS Chris Steyaert 10

11. Enhancements and variants of the method Sensitivity analysis Poisson Monte Carlo simplex (Verbelen_Gem2012, FLXHRG12, POISSRND, OFS1S 2012 note about other measures besides counts Enhancements Integral i/o point value (OFS1S exp intgr) Model sporadics i/o hourly values Other model Lorentz see Jenniskens p. 236