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Quadrantids - radio results

The mean Solar longitude of the Quadrantid shower maximum activity, derived from the analysis of radio results, was as follows:

2008
2007    283.130
2006    283.168    *
2005    283.182
2004    283.001
2003    283.133

* inconsistent analysis method.

2008 Quadrantids - radio results

Enric Fraile Algeciras (Spain)

Data

Analysis

The parameters were constrained such that width a = width b.

Tmax = 2007 January 04, 08:23 UT + ??h, width a = 7.4, b = 7.4.

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

Jeff Brower (Canada) 

Jeff was operating a number of systems for the 2008 Quadrantids. The following is the data and analysis for the 61.26 MHz system

Data 61.26 MHz

Analysis 61.26 MHz

Tmax = 2007 January 04, 06:30 UT + ?.?h, width a = 10.7, b = 3.5

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

Cosmos Observatory (The Netherlands) 

Data

Analysis

The parameters were constrained such that width a = width b.

Tmax = 2007 January 04, 05:07 UT + ?.?h, width a = 11.0, b = 11.0.

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

Gaspard DeWilde (Belgium) 

Data

Analysis

The parameters were constrained such that width a = width b.

Tmax = 2007 January 04, 03:27 UT + ?.?h, width a = 3.1, b = 3.1.

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

David Entwistle (England)

My initial impression from my 55.25 MHz radio results is of a typically strong, but brief, QUA return. The peak appears, very much as predicted, close to 2008 01 04 06h 40m UT. The dip in my recorded counts is to be expected as the radiant approached the Zenith and the reflection points become very distant. The FDHM looks to be approximately 24 hours, or 1.0 degree of solar longitude.

Data

Analysis

The parameters were constrained such that width a = width b.

Tmax = 2007 January 04, 04:47 UT + ?.?h, width a = 15.6, b = 15.6

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

Felix Verbelen (Belgium) 

Data

Analysis

The parameters were constrained such that width a = width b.

Tmax = 2007 January 04, 03:37 UT + ?.?h, width a = 1.9, b = 1.9.

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

2007 Quadrantids - radio results

The following analysis is based on the contents of Meteor Observation Bulletin No.162. 

The SBV* numerical analysis has been applied to the counts to separate the sporadic background from the shower meteors and so derive the stream characteristic. The Quadrantid shower is brief and the analysis method has been constrained such that the width a = width b, to limit the bias in the minimisation process.

Radio Quadrantids 2007 Peak Time (UT)

Radio Quadrantids 2007 Peak Solar Longitude (J2000)

Enric Fraile Algeciras (Spain)

Data

Analysis

Tmax = 2007 January 03, 22:14 UT + 0.8h, width a = 11, b = 11.

Peak solar longitude (J2000) = 283.060 + 0.0327

Jeff Brower (Canada)

Data

Analysis

Tmax = 2007 January 03, 23:37 UT + 0.94h, width a = 1.3, b = 1.3.

Peak solar longitude (J2000) = 283.118 + 0.040

David Entwistle (England)

Data

Analysis

Tmax = 2007 January 04, 00:53 UT + 0.7h, width a = 5.6, b = 5.6.

Peak solar longitude (J2000) = 283.172 + 0.030

Kawaguchi Science Museum (Japan)

Data

Analysis

I believe that peak activity occurred as the radiant was culminating, for a Japanese observer. This resulted in a double-humped characteristic to the observed stream and introduced the possibility of an ambiguous analysis.  Consequently, the preferred minimization was manually selected from a number of possible solutions.

Tmax = 2007 January 04, 00:33 UT +2.83 h , width a = 3.8, b = 3.8

Peak solar longitude (J2000) = 283.158 + 0.120

Andy Smith (England)

Data

Analysis

Tmax = 2007 January 03, 22:57 UT +1.5 h , width a = 12.4, b = 12.4

Peak solar longitude (J2000) = 283.090 + 0.064

Dave Swan (England)

Data

Analysis

Tmax = 2007 January 04, 01:07 UT +0.40 h , width a = 4.8, b = 4.8

Peak solar longitude (J2000) = 283.182 + 0.017

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).

2006 Quadrantids - radio results

The following information is based on the contents of Meteor Observation Bulletin No.150.

Enric Fraile Algeciras (Spain)

Tmax = 2006 January 03, 16:49 UT, width a = 3.2, b = 3.2.

Jeff Brower (Canada)

Tmax = 2006 January 03, 22:10 UT, width a = 8.8, b = 8.8.

Gaspard De Wilde (Belgium)

 

David Entwistle (England)

Tmax = 2006 January 03, 17:21 UT, width a = 5.1, b = 5.1.

Peter Knol (The Netherlands)

Stan Nelson (USA)

Original results moved +7 hours, from Mountain Standard Time to UT . Manual minimization.

Tmax = 2006 January 03, 20:24 UT, width a = 4.0, b = 4.0.

Sadao Okamoto (Japan)

Tmax = 2006 January 03, 20:30 UT, width a = 6.0, b = 6.0.

Andy Smith (England)

Tmax = 2006 January 03, 21:30 UT, width a = 6.7, b = 6.7.

Dave Swan (England)

Tmax = 2006 January 03, 17:32 UT, width a = 6.7, b = 6.7.

Felix Verbelen (Belgium)

Manual minimization.

Tmax = 2006 January 03, 19:00 UT, width a = 4.0, b = 4.0.

Acknowledgements

I am grateful to the following persons for their efforts in recording meteor counts: Enric Fraile Algeciras (Spain), Michael Boschat (Canada), Jeff Brower (Canada), Gaspard De Wilde (Belgium), David Entwistle (England), Pierre De Groote (Belgium), Patrice Guerin (France), Szabolcs Kiss (Hungary), Peter Knol (The Netherlands), Stan Nelson (USA), Sadao Okamoto (Japan), 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).

2005 Quadrantids - radio results

The following analysis is based on the contents of Meteor Observation Bulletin No.138. 

Radio Quadrantids 2005 Peak Time (UT)

Radio Quadrantids 2005 Peak Solar Longitude (J2000)

Jeff Brower (Canada)

Tmax = 2005 January 03,13:58 UT + 0.6h , width a = 8, b = 8

David Entwistle (England)

Tmax = 2005 January 03, 12:52 UT + 0.9 h , width a = 6, b = 6

Dave Swan (England)

Tmax = 2005 January 03, 11:36 UT + 1.1 h , width a = 2, b = 2

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).

2004 Quadrantids - radio results

The following analysis is based on the contents of Meteor Observation Bulletin No.126. 

Radio Quadrantids 2004 Peak Time (UT)

Radio Quadrantids 2004 Peak Solar Longitude (J2000)

Jeff Brower (Canada)

Tmax = 2004 January 04, 04:47 UT + 2h , width a = 9, b = 9

David Entwistle (England)

Tmax = 2004 January 04, 01:24 UT + 0.6 h , width a = 8, b = 8

iap-SkiyMet (Norway)

Tmax = 2004 January 04, 00:59 UT + 1.2 h , width a = 13, b = 13

Kimmo Lehtinen (Finland)

Tmax = 2004 January 04, 02:15 UT + 0.5 h , width a = 8, b = 8

Dave Swan (England)

Tmax = 2004 January 04, 02:02 UT + 0.3 h , width a = 4, b = 4

Istvan Tepliczsky (Hungary)

Tmax = 2004 January 04, 02:38 UT + 0.7 h , width a = 2, b = 2

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).

2003 Quadrantids - radio results

The following analysis is based on the contents of Meteor Observation Bulletin No.114. 

Please also see the SPA Meteor Section Special Report:  2003 Quadrantids.

Radio Quadrantids 2003 Peak Time (UT)

Radio Quadrantids 2003 Peak Solar Longitude (J2000)

Jeff Brower (Canada)

Tmax = 2003 January 03, 23:28 UT + 0.6h , width a = 4, b = 4

iap-SkiyMet (Norway)

Tmax = 2003 January 03, 23:14 UT + 1.5 h , width a = 10, b = 10

Robert Savard (Canada)

Tmax = 2003 January 03, 23:08 UT + 1.1 h , width a = 2, b = 2

Dave Swan (England)

Tmax = 2003 January 03, 23:39 UT + 0.5 h , width a = 7, b = 7

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).