2007 eta-Aquarids - Radio results
The following provisional information is based on a sample of results from the radio meteor observatories online web page.
Daytime meteor rates continued to rise through late April and early May to a broad peak around the 6th / 7th May. The decline in meteor rates after the eta-Aquarid peak was less pronounced with rates remaining relatively high after the peak. This was most likely due to increasing numbers of other daytime shower meteors including; the various Arietid steams, the zeta-Persieds and the omicron-Cetids. This made the location of the eta-Aquarid peak difficult. However, by concentrating on the five days around the predicted peak and using the SBV analysis* I arrived at the following results. These results are in good agreement with the time of the expected peak.
Radio eta-Aquarid 2007 Peak Time (UT)
Radio eta-Aquarids 2007 Peak Solar Longitude (J2000)
Enric Fraile Algeciras (Spain)
Tmax = 2007 May 6, 16:01 UT +10 h , width a = 13, b = 33
David Entwistle (England)
Tmax = 2007 May 7, 01:09 UT +22 h , width a = 52, b = 68
Observatoire de Lille (France)
Tmax = 2007 May 07, 05:20 UT +8 h , width a = 23, b = 22.
Dave Swan (England)
Tmax = 2006 May 06, 16:08 UT + 30 h, width a = 12, b = 97.
Felix Verbelen (Belgium)
Tmax = 2006 May 06, 17:26 UT + 19 h, width a = 34, b = 36.
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), Willy Camps (Belgium), Maurice De Meyere (Belgium), 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), Jean-Louis Rault (France), 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.
* '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).