interesante how meditation and concentration supposedly increase 'aura distribution'.

It's hard to tell if this is a joke post or not... still, I am laughing either way :)

If it's not a joke, I sincerely think your experience was from the after-image effect of looking at the sun...especially because it lasted 10 minutes afterward.

Still the after image effect in and of itself is a phenomenon and is in fact used to train aura vision. When the light receptors in your retina become overstimulated to one color of light, they lose sensitivity and the opposite or complimentary color will then appear as an after image howevering over your field of vision. For example, staring at an orange circle intensely and then looking at a white paper will yield a blue circle after image. Green becomes purple, etc. It can be used to train for aura vision though I think you still need to get the mercury and fluoride out of your brain first.