Time lapse videos of aurora and iridium flares

From: Tom Wagner (sciteach@mchsi.com)
Date: Wed Aug 03 2005 - 01:06:06 EDT

  • Next message: Stephan Szyman: "RE: Time lapse videos of aurora and iridium flares"

    I just got the following message (actually I did some editing) from Dana 
    Hrubes who is stationed at the Amundsen-Scott South Pole Station, 
    latitude -90 degrees. At the end of this post I reference some awesome time 
    lapse sequences showing stars, aurora and iridium flares taken down there by 
    a cohort of Dana. In this e-mail I have also included some other things he 
    said that I think are of special interest  being where he is, at the south 
    Here's Dana's edited e-mail..
    I have my web page up for July and I have a link to Glenn Kinoshita's site. 
    Glenn is wintering here also. He has some fantastic time lapse videos of 
    aurora during the mid-July iridium flares. In these videos you can see 
    auroras over the Atmospheric Research Observatory (note the green laser) 
    with a series of Iridium satellite flares repeating every nine minutes near 
    the constellation Grus.
    Glenn used a Nikon digital camera (model as yet unknown by Dana) that was 
    set for 50 sec exposures on each frame and the frames were shot 
    continuously. I think he used ISO 200. To make this possible we used a 
    heated box that you can put a camera in and leave for days at a time. I told 
    him to make sure he sets it up Aug 27 -28 for the 48 hour -8 magnitude 
    iridium marathon.
    By the way, it is -106 degrees F (-76.5 C) right now and it is dropping like 
    a rock and we are also at a physiological altitude of 11,430 feet and the 
    pressure is still dropping We reached -110.7 F at 1650 UTC, August 1. I was 
    hoping for another 6.4 degrees lower, so we would break the all time record 
    and also we'd be at the point where carbon dioxide freezes at the altitude. 
    We were at about 11,500 ft equivalent last night.
    To see the best of Glenn's videos go to 
    http://dhrubes.home.att.net/july-05.html and look at "aurora and iridium 
    flare movie #1", "aurora and iridium flare movie #2", and "aurora and 
    iridium flare movie #3" .
    I believe that Dana is using information about when to expect flare 
    "seasons" by what was predicted by Gerhard Holtkamp. That is probably how 
    Dana knows of the upcoming Aug 27 -28 for the 48 hour -8 magnitude iridium 
    marathon. So I think is is safe to say, thanks Gerhard!
    Clear skies,
     Tom  Iowa USA
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