[AZ-Observing] Re: Thursday Night's Sky Viewing
- From: "Dan Heim" <dan@xxxxxxxxxxxxx>
- To: <az-observing@xxxxxxxxxxxxx>
- Date: Fri, 29 Aug 2008 12:08:00 -0700
Jeremy, that's an incredible video of the circulation. Even allowing for
the 10 s time-lapse, that's pretty rapid rotation! I'm a bit of a weather
geek myself, and always appreciate nice shots like that. Many of my
"astrophotos" on the DFAC website (http://www.dfacaz.org/astrophotos.html)
are, in fact, meteorological phenomena. Thanks for posting that video!
Yes, the blue jets were quite impressive. I guess the color is due to their
altitude, and the fact that we're seeing a spectrum unfiltered by the usual
atmospheric haze and dust. They look more the color of sparks you see up
close (e.g., Van de Graff or Tesla coil type). I'd have had my camera out
there, but it was too windy for my tripod. We had gusts up to 40 mph here
in New River.
I've never seen a sprite, but I know other ground-based observers have. I
doubt I'm up high enough to really see that far above the storm. If we get
another show this weekend, I'm going to set up (and solidly anchor) my
tripod, and see what I can catch. I'll be using my fisheye lense for
broader coverage. I have this nifty accessory for my Canon EOS 20D that
allows me to automate time lapse sequences, so I'll set it for a picture
every 5 seconds or so, and see what shows up. With a half-Gb memory card, I
can get a couple hundred shots at decent resolution before I run outa
memory.
Dan
----- Original Message -----
From: <jeremy@xxxxxxxxxxxxxx>
To: <az-observing@xxxxxxxxxxxxx>
Sent: Friday, August 29, 2008 11:39 AM
Subject: [AZ-Observing] Re: Thursday Night's Sky Viewing
> Tom, thanks for sharing those photos.
>
> I was impressed by the almost non-stop light show from my driveway 140
> miles north. I wish I had been able to stay outside long enough to
> look for a hint of any jets or sprites--probably too far away though.
> I've never had the opportunity to witness these before. Thanks for
> sharing your observation of the jets, Dan! Those lengthy
> cloud-to-ground superbolts sound impressive--I wish I could have seen
> it.
>
> The national weather service is calling for an early season 'short
> wave' to drop down and really liven up the monsoon this weekend.
> Saturday and Sunday afternoon & evening sound like they might make for
> some good cloud & lightning photo ops. I'm going to try and keep
> myself open...
>
> The last out-of-season trough a couple weeks ago made for some
> fantastic storms up here. I got lucky with a full-daylight lightning
> photo from Mars Hill on Sunday the 17th:
>
> http://www.perezmedia.net/beltofvenus/archives/000821.html
>
> I also had a chance to get out and photograph a time lapse animation
> of dwindling rotation in the cell that apparently produced a tornado
> warning on Friday the 15th. (the youtube link is on that page too.)
>
> If we can't get clear skies, here's hoping for some other excitement
> in the sky (without the wind damage :)
>
> Jeremy
> http://beltofvenus.perezmedia.net
>
>
> Quoting Dan Heim <dan@xxxxxxxxxxxxx>:
>
> > Now that's an experiment I'd prefer not to participate in. :)
> >
> > Dan
>
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