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(meteorobs) Fwd from GeoZay Re: 1996 Perseid Maximum Analysis


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Date: Sun, 18 Aug 1996 11:09:14 -0400
From: GeoZay@aoldot com
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Subject: Re: 1996 Perseid Maximum Analysis

                   -------------------------------------
                 I M O   S h o w e r   C i r c u l a r
                 -------------------------------------
                             PERSEIDS 1996
 
 European observers suffered from an extensive cold front sweeping over
 central Europe on August 11 and 12. Most of the observers were not able
 to watch all night on August 11-12. The resulting patchy activity profile
 includes large standard deviations certainly due to uncertain cloud factors
 and quickly estimated limiting magnitudes.
 
 The new Perseid PEAK APPEARED once more, but significantly lower than in
 previous years. The main feature of the peak was its very steep rise within
 about 10 minutes. Several observers reported a number of fireballs at the
 beginning of the high activity.
 
 The peak appears to have a DOUBLE MAXIMUM. The large scatter of ZHR values,
 however, does not allow a significant conclusion, i.e. the double maximum 
 was not consistently observed by the majority of observers at that time. Yet
 two observers reported increased numbers of meteors brighter or equal 0m at
 the moments of both maxima.
 
 American observers witnessed a slightly increasing activity before the
 traditional maximum of the Perseids for which we do not have data yet.
 
 
 The following observers contributed to this analysis:

- -----------------------------------------------------------------------------
 Name		      IMO-code	Observing site			 Co-ordinates

- -----------------------------------------------------------------------------
 Rainer Arlt		ARLRA	Mewegen, Germany		 14.2E  53.5N
 Mark Davis		DAVMA	Awendaw, SC, USA		 79.6W  33.0N
 Raul Fernandez		FERRA	Aras de Alpuente, Spain		  1.1W  39.9N
 John Glover		GLOJO	Waltonville, IL, USA		 89.0W  38.2N
 Richard Huziak		HUZRI	Saskatoon, Canada		106.6W  52.0N
 Detlef Koschny		KOSDE	Buhle, Germany			 10.0E  51.6N
 Ralf Koschack		KOSRA	Natolewice, Poland		 15.4E  53.9N
 Oyvind Kristiansen	KRIOY   Porsgrunn, Norway		  9.7E  59.1N
 Vladimir Lukic		LUKVL   Mewegen, Germany		 14.2E  53.5N
 Norman McLeod		MCLNO	Ft Myers, FL, USA		 81.8W  26.6N
 Carl B. Miller		MILCA	Arroyo Grande, CA, USA		120.6W  35.1N
 John Penner		PENJO	Lake Los Angeles, CA, USA	118.0W  34.7N
 Tim Printy		PRITI	Christmas, FL, USA		 81.0W  28.6N
 Jurgen Rendtel		RENJU	Natolewice, Poland		 15.4E  53.9N
 Rene Scurbecq		SCURE	Aardenburg, The Netherlands	  3.5E  51.2N
 Wes Stone		STOWE	White River Canyon, OR, USA	121.7W  45.3N
 Richard Taibi		TAIRI	Temple Hills, MD, USA		 76.9W	38.4N
 Marko Toivonen		TOIMA	Kuusankoski, Finland		 26.6E	60.9N
 Nikolai Wunsche		WUNNI	Mewegen, Germany		 14.2E  
53.5N
 Ilkka Yrjola		YRJIL	Kuusankoski, Finland		 26.6E  60.9N
 George J. Zay		ZAYGE	Descanso, CA, USA		116.6W  32.8N

- -----------------------------------------------------------------------------
 
 
 Zenithal hourly rates are calculated with a zenith exponent of gamma=1.0
 and a population index r=2.0. '#Obs' is the number of observing periods
 involved in the average ZHR. The '+-' column gives the standard deviation
 of the ZHR mean.
 
 -----------------------------------------
   Date    Time  Sollong   #  PER  ZHR +-
   1996    (UT)  (J2000)  Obs      (r=2.0)
 -----------------------------------------
 Aug 10.93 2224  138.59    4   89   31  6
 Aug 11.31 0724  138.95    8  185   36 13
 
 Aug 11.90 2130  139.514   6  142   44 22
 Aug 11.98 2324  139.590  14  203   59 34
 Aug 12.01 0015  139.624   5   33   58 21
 Aug 12.02 0030  139.634   5   72  154 61
 Aug 12.03 0039  139.640   5   59   94 27
 Aug 12.04 0057  139.652   6   61   80 22
 Aug 12.05 0117  139.665   5  148  106 28
 Aug 12.07 0147  139.685   6  111   68 14
 Aug 12.23 0536  139.838   5   85   72 27
 Aug 12.29 0703  139.896   4  123   70 27
 Aug 12.38 0900  139.974   5  230   80 22
 Aug 12.45 1048  140.046   4  216   87 39
 
 Aug 13.23       140.793   7  178   79 19
 ----------------------------------------
 
 We would like to thank all observers who contributed to this overview of
 the Perseid maximum. The main contributors were the North American Meteor
 Network (NAMN) and the Arbeitskreis Meteore (AKM), Germany.
 
 
 Rainer Arlt, 1996 August 18.

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