(meteorobs) ZHR discrepancies?

• To: meteorobs@atmob.org
• Subject: (meteorobs) ZHR discrepancies?
• From: mlinnolt@alum.mitdot edu
• Date: Wed, 21 Nov 2001 15:45:13 -0500 (EST)
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I was reading various reports and noticed significant inter-observer variation in ZHR during specific time slots being reported. I presume everyone is using a similar formula to calculate ZHR, where the radiant elevation factor is given by 1/sin(elevation) and limiting magnitude correction by r^(LM-6.5). 

So how can we be seeing ZHR's varying by a factor of 5 at the same times for different observers? Is it possible the microstructure of the stream varies so much over different locations? The time spans of the observations seem too long for that. It could just be individual perception rates of the observers, of course, especially at the fainter end. But a factor of 5 is hard to explain even this way.

Any thoughts?

Mike Linnolt

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• Re: (meteorobs) ZHR discrepancies?
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