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Geminids - radio results

Based on the analysis below, the mean Solar longitude of the Geminid shower maximum activity was as follows:

2007    262.157
2006    262.350 
2005

2007 Geminids - Radio results

The following information is based on a sample of results taken from the contents of Meteor Observation Bulletin No.173.

Radio Geminids 2007 Peak Time (UT)

Radio Geminids 2007 Peak Solar Longitude (J2000)

Willy Camps (Belgium)

Data

Analysis

Tmax = 2007 December 14, 16:57 UT +1.3 h, width a = 67.2, b = 7.2

Peak solar longitude (J2000) = 262.21 + 0.06

Cosmos Observatory (The Netherlands)

Data

Analysis

Tmax = 2007 December 14, 12:30 UT +3.3 h, width a = 112.4, b = 21.8

Peak solar longitude (J2000) = 262.02 + 0.14

Gaspard DeWilde (Belgium)

Data

Analysis

Tmax = 2007 December 14, 14:39 UT +1.3 h, width a = 51.7, b = 13.4

Peak solar longitude (J2000) = 262.11 + 0.06

David Entwistle (England)

Data

Analysis

Tmax = 2007 December 14, 18:07 UT +2.1 h, width a = 98.8, b = 16.5

Peak solar longitude (J2000) = 262.26 + 0.09

Dave Swan (England)

Data

Analysis

Tmax = 2007 December 14, 14:47 UT , width a = 71.2, b = 18.6

Peak solar longitude (J2000) = 262.12 + 0.06

Felix Verbelen (Belgium)

Data

Analysis

Tmax = 2007 December 14, 16:55 UT , width a = 27.0, b = 8.5

Peak solar longitude (J2000) = 262.21 + 0.06

2006 Geminids - Radio results

The following information is based on a small sample of results taken from the contents of Meteor Observation Bulletin No.161. 

Radio Geminids 2006 Peak Time (UT)

Radio Geminids 2006 Peak Solar Longitude (J2000)

Gaspard DeWilde (Belgium)

Data

Analysis

Tmax = 2006 December 14, 11:36 UT +1.6 h , width a = 33, b = 10

Peak solar longitude (J2000) = 262.237 + 0.067

Andy Smith (England)

Data

Analysis

Tmax = 2006 December 14, 16:13 UT +1.5 h , width a = 77, b = 13

Peak solar longitude (J2000) = 262.433 + 0.062

Felix Verbelen (Belgium)

Data

Analysis

Tmax = 2006 December 14, 14:58 UT +6 h, width a = 33, b = 7.

Peak solar longitude (J2000) = 262.380 + 0.247

2005 Geminids - Radio results

The following information is based on a small sample of results taken from the contents of Meteor Observation Bulletin No.149 and the Radio Meteor Observation in Japan bulletin No. 050.

Enric Algeciras (Spain)

Data

Analysis

Tmax = 2005 December 14, 00:30 UT +?.? h , width a = 58, b = 24

Peak solar longitude (J2000) = ???.??? + ?.???7

Towada Technical High School (Japan)

Data

Analysis

Tmax = 2005 December 13, 17:19 UT +?.? h , width a = 37, b = 13

Peak solar longitude (J2000) = ???.??? + ?.???7

Felix Verbelen (Belgium)

Data

Analysis

Tmax = 2005 December 14, 09:30 UT +?.? h , width a = 26, b = 4

Peak solar longitude (J2000) = ???.??? + ?.???7

2002

If we look at the hourly rates for the 13th and 14th of December 2002, we see two peaks each day. This is a characteristic of the radio detection system and is caused by the shower's radiant being presented at the most favourable position above the observer's horizon to reflect signals.

If we do not know the radiant's position we can use the radio results to calculate an approximate position.

Acknowledgements

I am grateful to the following persons for their efforts in recording meteor counts: Enric Fraile Algeciras (Spain), Orlando Benitez Sanchez (Gran Canaria), Michael Boschat (Canada), Jeff Brower (Canada), Cosmos Observatory & F J W Kooiman (The Netherlands), Gaspard De Wilde (Belgium), David Entwistle (England), Pierre De Groote (Belgium), Patrice Guerin (France), Peter Knol (The Netherlands), Stan Nelson (USA), Sadao Okamoto (Japan), Valter Gennoro (Italy), Mike Otte (USA), Andy Smith (England), Dave Swan (England), Istvan Tepliczky (Hungary), Felix Verbelen (Belgium). I'm especially grateful to Christian Steyaert for his efforts in collecting, collating and distributing the rmobs data and to Pierre Terrier for his work in supporting this effort.

References

* 'A numerical method to aid in the combined determination of stream activity and Observability Function', by Christian Steyaert, Jeffrey Brower, and Felix Verbelen. Taken from WGN, the Journal of the IMO 34:3 (2006).