Saturday, 4 June 2011

Die "Jet Stream" beïnvloed jou waarnemingsomstandighede!

 Kliek om te vergroot
 Die Suidelike "Jet stream" soos op 4 Junie 2011 besig om oor Suidelike Afrika te beweeg. Tog as jy na die Wolkekaart van Kobus Botha (hieronder) kyk is dit oopgetrek oor Suid-Afrika.  
Kliek om te vergroot

Hoe gaan die "seeing" vanaand by Boyden wees? Waarskynlik onstabiel. Is dit nie `n nfaktor wat ons amateurs nie in gedagte hou as ons observasieaande beplan nie. Agterna kla ons oor die voorwerpe wat rondspring.

Lees gerus die artikel hieronder wat ek op `n webtuiste raak ge-google het.  Onderaan is 'n paar skakels.

Source: Astronomy Club of Asheville
"Seeing" refers to the the amount of "blurring" caused by the earth's atmosphere -- most apparent in a telescope using higher magnifications.  Astronomers refer to this atmospheric turmoil as "bad seeing".  Seeing well at high magnifications is only possible when the air is steady.

Excellent seeing means, at high magnification, you will see fine detail on planets.  In bad seeing, planets might look like they are under a layer of rippling water and show little detail at any magnification, but the view of galaxies is probably undiminished.

Bad seeing is caused by turbulence combined with temperature differences in the atmosphere.  The turbulence may be caused by ground level winds as well as higher level air movements created by the jet stream. When the jet stream is overhead, seeing is generally poor.

Bad seeing can occur during perfectly clear weather.  Often good seeing occurs during poor transparency.  It's because seeing is not very related to the water vapor content (transparency) of the air. 

Skakels







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