Archive for the ‘Eric Grieve’ Category

Solar Disk Imaged by Eric Grieve

A sunspot is an area on the Sun’s surface (its photosphere) that appears dark because they are cooler than the surrounding area  – approximately 4,000–4,500 K compared with the 5,800 K of the surrounding material at about 5,800 K .  They are visible as a dark spot because the intensity...
August 3rd, 2009 | Eric Grieve | Read More

Sun Dog and Circumzenithal Arc Photographed by Eric Grieve

A sun dog or sundog is a type of ice halo. It is a colored patch of light to the left or right of the sun.  The circumzenithal arc is similar in appearance to a rainbow.  It is caused by refraction of sunlight through horizontally-oriented ice crystals.
August 3rd, 2009 | Eric Grieve | Read More