# Re: Thoughts on the Upcoming Geosat Flaring Season

From: Bjoern Gimle@GlocalNet (Gimle@GlocalNet)
Date: Thu Feb 19 2009 - 10:27:15 UTC

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The angle of concentrators, giving flare 45 degrees off sun-sat direction,
is 67.5 degrees.
At 45 degrees, all the light from one will go directly to the other, and
then back to the Sun, like a normal flare.
Values between 45 and 90 give some efficiency boost, largest near 90 - but
requiring huge concentrators.
My calculations in http://www.algonet.se/~b_gimle/Solar concentrators.xls

----- Original Message -----
From: "B Gimle @ComHem" <b.gimle@comhem.se>
To: "post seesat" <SeeSat-L@satobs.org>
Sent: Wednesday, February 18, 2009 10:11 PM
Subject: Re: Thoughts on the Upcoming Geosat Flaring Season

> On analysing the geometry causing this, I dismissed the '45 degrees'
> falsely (?) on these grounds:
>
> No value for the solar concentrator angles found
> They appeared closer to 60 then 45
> 45 degrees will cause sun-concentrator-panel beams to reflect to the other
> concentrator, then back towards the Sun, ie normal geoflare.
> 60 degrees will end up 60 degrees off.
>
> But there can/will be some angle near 60 that will end up 45 degrees off -
> probably  (15*45+45*60)/60 = 56.25
>
> /Björn
>
> ----- Original Message -----
> From: "Ed Cannon" <edcannonsat@yahoo.com>
> To: "post seesat" <SeeSat-L@satobs.org>
> Sent: Wednesday, February 18, 2009 6:47 AM
> Subject: re: Thoughts on the Upcoming Geosat Flaring Season
>
>
>> Further follow-up on this thread.  Kevin wrote
>> regarding ones I've reported in the "three hours
>> early" position in RA:
>>
>>> That would be the Boeing 702's with angled
>>> reflector panels.
>>
>> This is just another small correction.  I have
>> also seen (with small binoculars and in some
>> cases without magnification) the following
>> other ones in that position:
>>
>> 24936, 97-050A, GE 3 (Lockheed Martin AS or A 2100)
>> 25954, 99-060A, GE 4 (Lockheed Martin AS or A 2100)
>> 28446, 04-041A, AMC 15 (Lockheed Martin AS or A 2100)
>> 23192, 94-047A, DirecTV 2 (DBS 2) *OR*
>> 25937, 99-056A, DirecTV 1R (both Boeing 601)
>>
>> and possibly GE 1 (Lockheed Martin AS or A 2100)
>>
>> By the way, I think that Thuraya 1 was stationed
>> on the other side of the world.  I've never seen
>> that one.
>>
>> Ed Cannon - Austin, Texas, USA
>>
>>
>>
>>
>>
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