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Transit of space station across the sun - 2 questions
Dear
"Alexander Thesoso" wrote in message news:EOxQg.1276$xh.869@trnddc02... I just stumbled across a photo of the transit of the space station, and the shuttle across the sun. http://www.astrophoto.fr/iss_atlantis_transit.html Good photo. Thanks for the link! I have two questions, each demonstrating my ignorance... 1) I don't see any sunspots... why not? Upper right hand corner of the image... you have to scroll across to it. Also, with the "local" detail to focus the ISS and shuttle, smaller sunspots may be lost. http://www.lmsal.com/YPOP/Projection...t_MDI_CON.html 2) I see a lot of limb-darkening. Why? If the surface of the sun is isotropic, It isn't, exactly. isothermal It isn't, exactly. and the atmosphere is at least as hot as the surface, Again, it isn't exactly. why the limb darkening? http://en.wikipedia.org/wiki/Limb_darkening David A. Smith |
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Transit of space station across the sun - 2 questions
Thank you... my bad... I was impatient and didn't look carefully enough.
The sunspot sure-enough is there. "N:dlzc D:aol T:com (dlzc)" N: dlzc1 D:cox wrote in message news:CMFQg.190$v43.183@fed1read02... Dear "Alexander Thesoso" wrote in message news:EOxQg.1276$xh.869@trnddc02... I just stumbled across a photo of the transit of the space station, and the shuttle across the sun. http://www.astrophoto.fr/iss_atlantis_transit.html Good photo. Thanks for the link! I have two questions, each demonstrating my ignorance... 1) I don't see any sunspots... why not? Upper right hand corner of the image... you have to scroll across to it. Also, with the "local" detail to focus the ISS and shuttle, smaller sunspots may be lost. http://www.lmsal.com/YPOP/Projection...t_MDI_CON.html 2) I see a lot of limb-darkening. Why? If the surface of the sun is isotropic, It isn't, exactly. isothermal It isn't, exactly. and the atmosphere is at least as hot as the surface, Again, it isn't exactly. why the limb darkening? http://en.wikipedia.org/wiki/Limb_darkening David A. Smith |
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Transit of space station across the sun - 2 questions
On Thu, 21 Sep 2006 17:04:52 -0700, "N:dlzc D:aol T:com \(dlzc\)" N:
dlzc1 D:cox wrote: Dear "Alexander Thesoso" wrote in message news:EOxQg.1276$xh.869@trnddc02... I just stumbled across a photo of the transit of the space station, and the shuttle across the sun. http://www.astrophoto.fr/iss_atlantis_transit.html Good photo. Thanks for the link! I have two questions, each demonstrating my ignorance... 1) I don't see any sunspots... why not? Upper right hand corner of the image... you have to scroll across to it. Also, with the "local" detail to focus the ISS and shuttle, smaller sunspots may be lost. It looks like there's another one to the left of ISS and shuttle at the edge. One can also see the "active regions" that surround them. In any case, its an amazing picture! http://www.lmsal.com/YPOP/Projection...t_MDI_CON.html 2) I see a lot of limb-darkening. Why? If the surface of the sun is isotropic, It isn't, exactly. isothermal It isn't, exactly. and the atmosphere is at least as hot as the surface, Again, it isn't exactly. why the limb darkening? http://en.wikipedia.org/wiki/Limb_darkening David A. Smith |
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