Tim,

In all likelyhood, LNL coordinated with the FFA and air traffic controllers
to ensure that flight paths were routed to avoid the anticipated path of the
laser. To obtain the best results, of course, the laser was pointed
perfectly veritically, further minimizing the possibility of illuminating a
cockpit.

Also, San Jose and Oakland airports have very little or no traffic after
midnight. The only traffic arriving at SFO late at night is coming from the
west and is routed well north of Mount Hamilton.

In view of all of this, the Lick system has very little chance of ausing a
hazard to aircraft navigation.

Randy Marsden
San Diego

----- Original Message -----
Sent: Thursday, March 24, 2005 8:38 AM
Subject: RE: green vrs red lazer


This begs the question... How do observatories such as the Lick get away
with using the huge lasers on their adaptive optics systems? The lick
observatory is quite close to at least three airports and a zone of busy air
traffic.


Tim Long
http://syd.tigranetworks.co.uk - software for amateur astronomers



> -----Original Message-----
> Sent: Thursday, March 24, 2005 3:53 PM
> Subject: Re: green vrs red lazer
>
> There was in the morning paper an article about an amateur
> astronomer who has a federal indictment against him because
> of pointing a green laser at an
> airplane. He claimed he was showing his son the sky.
> They do use green
> lasers at the evening Kitt Peak sessions.
> They are nice, but should be used with care. Some are now up
> to 25 mw which can be dangerous to vision.
>
> Doc G
>
> ----- Original Message -----
> Sent: Thursday, March 24, 2005 4:16 AM
> Subject: Re: green vrs red lazer
>
>
> >
> > On Mar 23, 2005, at 11:42 AM, Frank wrote:
> >
> >> Tim, you are exactly correct.
> >>
> >> FYI, the eye is more sensitive to green light than to red.
> I believe this
> >> is the primary reason the grean beam is visible. We also
> know that the
> >> atmosphere does not scatter red light to the extent of some other
> >> colors -- the reason a sunset is red and the sky blue.
> >
> > The visible beam that you see is the light reflected off of small
> > particles of dust or water in the air not the air molecules
> themselves. I
> > took mine up to 11,000 ft in Colorado where the air is very
> clean and the
> > beam disappeared. Try your green laser on a night of very
> thin fog (when
> > you can't do astronomy anyway); the beam is really
> impressive in those
> > conditions :-)
> >
> > --
> > Bill Arnett
> > Emerald Hills CA USA 37 27 N 122 15 W
> >
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MAPUG is hosted by Software-y-Ddraig (Dragon Software)
http://syd.tigranetworks.co.uk
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