I made several errors here. 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 >> >> >> >> >> >> ------------------------------------------------------------------------- >> Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: >> http://www.satobs.org/seesat/seesatindex.html >> > > > ------------------------------------------------------------------------- > Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: > http://www.satobs.org/seesat/seesatindex.html > ------------------------------------------------------------------------- Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: http://www.satobs.org/seesat/seesatindex.html
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