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Perseids - radio results

Based on the analysis below, the mean Solar longitude of the Perseid shower maximum activity, derived from the analysis of radio results, was as follows:

2007    139.850 
2006    140.223 
2005    139.499 

2007 Perseids - Radio results

The following analysis is based on the contents of Meteor Observation Bulletin No.169 and the contents of Radio Meteor Observation in Japan No.070.

Initial analysis of the radio meteor results suggested a broad and ill-defined maximum, from roughly 18h-06h UT on August 12-13. There were hints of somewhat increased activity around 23h-00h and 01h-03h UT then, perhaps with weaker enhancements around 10h-11h and 12h-13h UT on August 13. 

Radio Perseids 2007 Peak Time (UT)

Radio Perseids 2007 Peak Solar Longitude (J2000)

Jeff Brower (Canada)

Data

Analysis

Tmax = 2007 August 13, 03:09 UT + 3.6 hr width a = 29, b = 21.

Willy Camps (Belgium)

Data

Analysis

Tmax = 2007 August 13, 06:05 UT + 11 hr width a = 16, b = 17.

Gaspard DeWilde (Belgium)

Data

Analysis

Tmax = 2007 August 13, 01:30 UT + 15 hr width a = 22, b = 26.

Naoya Saito (Japan)

Data

Analysis

Tmax = 2007 August 12, 16:30 UT + 15 hr width a = 34, b = 51.

Felix Verbelen (Belgium)

Data

Analysis

Tmax = 2007 August 13, 03:00 UT + 7 hr width a = 35, b = 22.

2006 Perseids - Radio results

The following information is based on the contents of Meteor Observation Bulletin No.157. 

Although many observations were troubled by sporadic E the following observers recorded five days worth of continuous data, free from obvious problems, around the Perseid predicted peak. 

Looking at the raw radio data, it appears that the 2006 Perseid stream may have contained multiple sub-peaks. Consequently Jeff Brower and the Japanese observers observed an earlier Perseid peak. This earlier peak appears weakly in the results of Entwistle, but was not strongly represented in the other  European observers results. This is perhaps understandable, as the radiant was relatively low in Europe at that time. The European observers observed a later peak, which was missed by Jeff, as the radiant was low in his location at that time. The second peak only appears weakly in the Japanese results.

A stream containing multiple sub peaks does not lend itself well to the standard analysis applied to the other streams.

Radio Perseids 2006 Peak Time (UT)

In progress

Radio Perseids 2006 Peak Solar Longitude (J2000)

In progress

Jeff Brower (Canada)

Data

Analysis

Gaspard DeWilde (Belgium)

Data

Analysis

Tmax = 2006 August 13, 01:45 UT +3 h , width a = 22, b = 20

David Entwistle (England)

Data

Analysis

Tmax = 2006 August 13, 03:30 UT +8.5 h , width a = 34, b = 32

Sadao Okamoto (Japan)

Data

Analysis

Tmax = 2006 August 12, 23:30 UT +?.? h , width a = 26, b = 23

Hirofumi Sugimoto (Japan)

Data

Analysis

Felix Verbelen (Belgium)

Data

Analysis

Tmax = 2006 August 13, 08:30 UT +7 h, width a = 50, b = 28.

2005 Perseids - Radio results

The following information is based on a small sample of results taken from the contents of Meteor Observation Bulletin No.145. 

Radio Perseids 2005 Peak Time (UT)

In progress.

Radio Perseids 2005 Peak Solar Longitude (J2000)

In progress

In progress

Jeff Brower (Canada)

Data

Analysis

Tmax = 2005 August 12, 04:24 UT +?.? h , width a = 4, b = 25

Peak solar longitude (J2000) = 139.499 + ?.???

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), 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).