Aura and Chakra energies are the Etheric Layer of our body, which supplies energy to whole body. If the supply of unmanifested energy forces is absolute than everything converts into blissfulness.
Composite electro-magnetic field of Spirit and Serpent Energy (kundalini) is Aura. Aura is a measurable energy field developed by pure etheric energies. The only difference is etheric energy termed only for etheric body and Aura Energy for complete physical existence.
Our etheric body also has all the organs and glands in the form of energy, when organs in etheric body is completely energized than our manifested organs will be good in health. Etheric body connects our physical body through Chakras, these 7 chakras powers the manifested organs by distributing and consuming the etheric energies.