Please explain.

bloodhound31 · #1 20-09-2008, 07:56 PM

So how does this page tell me if it's a good night for planetary imaging?

http://weather.unisys.com/gfs/12h/gf...l_12h_aus.html

Baz.

TrevorW · #2 20-09-2008, 08:16 PM

Nbid

Bol

Ian Robinson · #3 20-09-2008, 08:39 PM

Well , it lets you that most of Australia is warm, there are light winds and there is little rain falling , but the colour palets are difficult to interpret on my 15" ultrahigh resolution monitor.

Really don't need these charts to tell me it's a top night, if only the dambed moon was going to stay away. All I need do turn out the lights and go out my back door to see that.

spacezebra (Petra) · #4 20-09-2008, 08:39 PM

No idea

But hey! its mightly colourful!

Cheers Petra d.

StephenM (Stephen) · #5 20-09-2008, 08:59 PM

Hi Baz,

I think the top left is the jetstream map, which gives an indication of upper atmosphere stability - the slower it is, the better the seeing.

Matt, where are you? (Matt put me on to it...)

Cheers,
Stephen

matt · #6 20-09-2008, 09:33 PM

Bottom line...just pay attention to the map at upper right. (The 300mb map).

It's the one which most accurately pertains to jetstream conditions which are likely to affect seeing and consequently imaging...particularly planetary.

Stephen - the map at top left has nothing to do with wind speed, which is the critical factor at this particular atmospheric level. The map at top left is about temperature.

bloodhound31 · #7 21-09-2008, 09:36 AM

Quote:

Originally Posted by matt

Bottom line...just pay attention to the map at upper right. (The 300mb map).

It's the one which most accurately pertains to jetstream conditions which are likely to affect seeing and consequently imaging...particularly planetary.

Thanks folks.

Matt, Ok, top right. So how do I read it? What does it all mean? If I have a green blob above my location, is that good or bad? I am a jet-stream numpty

and have never factored these into my imaging sessions. Any help

would be appreciated.

Cheers,

Baz.

bloodhound31 · #8 21-09-2008, 11:38 PM

Anyone?

Surley there are a few brainiacs in here......

Jen · #9 23-09-2008, 05:48 PM

Matty P (Matt) · #10 23-09-2008, 05:57 PM

That map is just confusing. Too many bright colours.

I have absolutely no idea what the difference in colour means or anything else on that map, for that matter.

Lester · #11 23-09-2008, 06:01 PM

Hi Baz,

the best is to have the pink areas over your location to show minimal jetstream and the chance for good seeing and planetary imaging conditions. I have got resonable images even when there was dark blue over my location.

Keep in mind that this is only the jetstream, which is high altitude, you still require the mid and lower layers to be calm also; or going in the same direction.

All the best.

JethroB76 (Jeff) · #12 23-09-2008, 06:25 PM

Why the confusion?

There is a legend at the bottom of the chart with windspeed denoted by various colours; lower the wind speed the better.

matt · #13 23-09-2008, 06:39 PM

Quote:

Originally Posted by JethroB76

Why the confusion?

There is a legend at the bottom of the chart with windspeed denoted by various colours; lower the wind speed the better.

Thanks.

It seemed pretty obvious to me too, given there is a key to the various colours at the bottom of each map.

That's also true Lester. All of these maps, of any variety, taken individually, will only tell part of the story.

It's all about familiarising oneself with all of the available resources and tallying up which ones give you the 'good oil' on nights which turn out to be great seeing. It's probably best to make notes of what all the variables were doing when you experience'd great seeing. That way, you can watch out for them being the same again and make an informed decision as to which nights will deliver a good outcome.

bloodhound31 · #14 23-09-2008, 07:45 PM

Quote:

Originally Posted by JethroB76

Why the confusion?

There is a legend at the bottom of the chart with windspeed denoted by various colours; lower the wind speed the better.

Because I can admit that

Right wiv ya Jen!

Some things are only obvious AFTER someone has pointed them out.....Now I know and am that much better armed for astrophotography with the knowledge of a simple thing.

Thanks so much Lester. Good on yer mate.

Baz.

Jen · #15 24-09-2008, 10:44 PM

Quote:

Originally Posted by bloodhound31

Because I can admit that

Right wiv ya Jen!

Some things are only obvious AFTER someone has pointed them out.....Now I know and am that much better armed for astrophotography with the knowledge of a simple thing.

Thanks so much Lester. Good on yer mate.

Baz.

oh read the final print hahha....
well i was always taught to look at the pictures first when i was a kid

:roll eyes: