From: Gregg Hendry (
Date: Thu May 31 2012 - 13:59:25 UTC

  • Next message: alberto rango: "4641 SATOBS 30 MAY 2012."

     CALIPSO laser light is indeed rather difficult to observe - Often very
    bright however and easy to "see" once the advanced planning, weather,
    travel, and luck come together.
    A review of the CALIPSO data availability calendars indicates that the
    laser is "on" more than "off" -  but the missing 10 to 30 percent should
    clearly be taken into account before setting out for an observation.  (  The repeating ground
    tracks are 80 miles apart at latitude 40 degrees and night passes are
    always in the wee hours of the morning. (That's right officer, laser beams
    from outer space, yup, right here.  Now if you would pleae turn off those
    flashing lights...)
    Gregg Hendry
    On Wed, May 30, 2012 at 9:10 AM, George Roberts <> wrote:
    > I'm probably wrong about this but I seem to remember that the laser is
    > usually off and you have to pay attention to announcements to know when
    > they
    > switch it on and that they switch it on typically for a few days at a time
    > so it's tricky: you have to wait for it to be turned on, wait for clear
    > skies and likely travel a few hundred miles to the nearest spot (possibly
    > at
    > 3am) and be within a few hundred meters of where the laser is aiming (with
    > my luck probably in front of the local sheriff's home).  But worth the
    > trouble!
    > - George Roberts
    > -----Original Message-----
    > From: Björn Gimle
    > Sent: Wednesday, May 30, 2012 11:01 AM
    > To:
    > Cc: SeeSat-L
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