chiayk@pop.singnet.com.sg ha scritto: > Hi Tom: > I did similar but not exact simulated run before. U will see SIMILAR > magnitude in +/- 8 km ( or 16 km) corridor from a centre line for very > bright flares. I am not sure the drop-off is similar for other > magnitude. I guesstimage the visual corridor is around 20-25km from > flare centre or (40-50km corridor). > > >So the question is:What is the normal "corridor of visibility" for the > Iridium flares as seen by others? The maximum brightness of an Iridium Flare at the center line depends on satellite elevation upon the horizon because of its distance from us. An Iridium Flare at the Zenith point will be at maximum brightness and it plots on the ground concentric circles where the flare becomes dimmer as we go away from center line. In most cases the plots on the ground will be concentric ellipses more elongated when the satellite are lower upon the horizon. So, a "high elevation flare" has a small "corridor" where there's maximum brightness (60° elevation = +/- 3 km) and a "low elevation flare" at 10° can be observed at maximum in +/- 15 km. In my page about Iridium Flares at: http://www.geocities.com/pbussola/iridium.html I drawed two graphs about the brightness of 2 flares at 60° and 10° of elevation. They are very interesting! Bye! Paolo Bussola ----------------------------------------------------------------- Unsubscribe from SeeSat-L by sending a message with 'unsubscribe' in the SUBJECT to SeeSat-L-request@lists.satellite.eu.org http://www2.satellite.eu.org/seesat/seesatindex.html
This archive was generated by hypermail 2b29 : Thu May 11 2000 - 04:32:37 PDT