What is the Aura ?
Aura of leaf in Kirlian Camera
Everything in the Universe seems to be just a vibration. Every atom, every part of an atom, every electron, every elementary “particle”, even our thoughts and consciousness are just vibrations. Hence, we may define the Aura as a electro-photonic vibration response of an object to some external excitation (such as an ambient light for example). This definition is sufficient for the purpose of reading Auras, providing that we can train ourselves to see the Aura vibration. The Aura around humans is partly composed from EM (electromagnetic) radiation, spanning from microwave, infrared (IR) to UV light.
The low frequency microwave and infrared part of the spectrum (body heat) seems to be related to the low levels of the functioning of our body (DNA structure, metabolism, circulation etc.) whereas high frequency (UV part) is more related to our conscious activity such as thinking, creativity, intentions, sense of humor and emotions. Russian scientists, who seem to be about 3 decades ahead of everyone else in Aura research, make experiments suggesting that our DNA can be altered, by influencing its microwave Aura. The high frequency UV part is very important and most interesting but largely unexplored. And this part can be seen with naked eyes.

Aura of Coins in Kirlian Camera
By reading Aura it seems possible to diagnose malfunctions in the body (diseases) long before physical symptoms become evident. By consciously controlling your Aura you can actually heal yourself. However, healing of the physical body is nothing in comparison to what seeing and reading auras can do for our consciousness, spiritual development and our awareness of Nature …
Auras can be trapped using Kirlian Camera - a special device which forms photogram result from high voltage with minimum corona discharge - a electric field around the edges of objects. Although there are much controversy behind aura trapping, many great saints and scholars has proven people are able to see aura of others through deep meditation and concerntration.
Test this
Place the picture in Fig 1 about 1.5 m in front of you. Look exactly at the black spot for 30 seconds or so and observe colored dots with your peripheral vision. Resist temptation to look anywhere else but the black spot.

Note that colored areas seem to be surrounded by the “Aura” of a different color. When peripheral sensors are stimulated for some time, we have color sensations, much different than when we use the central vision. The longer you concentrate, the brighter is the “Aura” around colored areas, because your sensitivity increases.
Source: http://www.thiaoouba.com