[AZ-Observing] Re: Green Flash Musings...

  • From: Dan Heim <dan@xxxxxxxxxxxxx>
  • To: az-observing@xxxxxxxxxxxxx
  • Date: Mon, 31 Dec 2012 13:53:40 -0700

Yeah, that occurred to me too. At least for casual observers who just 
get lucky. But for someone seriously seeking a GF, and using GPS with a 
digital planetarium, you'd know exactly when and where to look/aim. It's 
been done, as that YT video shows (GF comes in around the 1:00 
time-stamp). Thinking more about my question, I suspect air layering 
might make the difference, especially over water. It comes down to the 
ability of water to store heat (compared to air), and transfer that heat 
to the air. No? The preponderance of sunset GFs seems to select for cool 
air over warm water (or desert terrain).

Dan Heim

On 12/31/2012 1:23 PM, Richard Harshaw wrote:
> It probably has to do with knowing precisely where the sun is setting (or
> rising). To see a morning green flash, you'd have to be looking at PRECISELY
> the point on the horizon where it will emerge.  It is much easier to watch
> it fall below the horizon.
> Richard Harshaw
> Cave Creek, AZ
> "Remember:  your mind works faster than you think."
> Subject: [AZ-Observing] Re: Green Flash Musings...
> I like that shot over Lake Michigan. I grew up on the Wisconsin side of that
> lake (before I'd even heard of the GF), so that made me wonder if there's
> any sunrise green flashes in the photographic record. Found this on YT:
> http://www.youtube.com/watch?v=FU16l-WSq_k
> Why are there so many more photographic examples of sunset GFs? Could it be
> the air is just layered better near sunset? Or more people are awake then,
> compared to sunrise.  :)
> Dan Heim
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