Re: Flare Visibility From Torquay

From: Bjoern Gimle@GlocalNet (Gimle@GlocalNet)
Date: Fri Mar 20 2009 - 11:48:55 UTC

  • Next message: Marcus Clark: "RE: Flare Visibility From Torquay"

    Hi Marcus,
    
    apologies for not responding promptly.
    525 km was "out of the blue", just to verify that the selection did produce 
    the correct output.
    As Simone pointed out, the prediction algorithm is still experimental, so it 
    is useful to observe from far.
    An ideal reflection has a cone width of the Sun = .5 degrees. I don't know 
    how ideal NOSS's flaring surface is.
    If NOSS is at 1100 km height near zenith, this is just 10 km wide, but 
    lower=longer range=wider beam, and it is also elliptical, pointing away from 
    the satellite because of the oblique view.
    And if the surface is not "shiny"=specular it becomes wider yet.
    
    /Björn
    
    ----- Original Message ----- 
    From: "Marcus Clark" <marcus_j_clark@hotmail.com>
    To: "Satrack" <satrack@libero.it>; "Bjoern Gimle" <bg_26934@glocalnet.net>; 
    "SeeSat Posts" <seesat-l@satobs.org>
    Sent: Friday, March 20, 2009 10:43 AM
    Subject: Flare Visibility From Torquay
    
    
    
    Hi!As Bjoern has pointed out, SkyMed gives visible NOSS flare prediction 
    from Torquay UK (50.5 N, 3.5 W) today about 19:28 UTC if I input the txt 
    file from the flare tracker website and set Maximum Distance to 525km.
     Is 525km an appropriate value and could you explain how the Max Distance 
    value should be determined? Is it simply related to the height of the 
    objects orbit or is it more to do with the horizon, or both?
     I am ignorant of orbital elements but willing to learn!!
     Best regards,
                Marcus Clark
    
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