Changes constantly. It is like a mood ring. We have many energy layers, your aura is just one of them.
1) Physical auric body - Physical sensations. Simple physical comfort, pleasure, health.
2) The etheric auric body - Emotions with respect to self. Self-acceptance and self love.
3) Vital auric body - Rational mind. To understand the
situation in a clear, linear, rational way.
4) Astral (emotional) body - Relations with others. Loving interaction with friends and family.
5) Lower mental auric body - Divine will within. To align with the divine will within, to make commitment to speak and follow the truth.
6) Higher mental auric body - Divine love, and spiritual ecstasy.
7) Spiritual (intuitive) body - Divine mind, serenity. To be connected to divine mind and to understand the greater universal pattern.
(
http://www.reiki-for-holistic-health...rmeanings.html)
This one is the one I follow
Aura Colors Meaning
RED: lifeforce, survival, raw passion, anger, frustration, menstruation, determination, sense of importance, feeling overwhelmed by change
ORANGE: sensuality, physical pleasure, emotional self-expression, creativity, lacking reason, lacking self-discipline, health, vitality
YELLOW: mental alertness, analytical thought, happiness, optimism, child-like, ego driven, thinking at expense of feeling
GREEN: healing, peace, nurturing, new growth, fear, need for security, jealousy and envy, balance
BLUE: verbal communication, freethinking, relating to structure and organization, emphasis on business, male energies, sadness, possibilities
PURPLE: wisdom, authoritative, female energies, matriarchal, sense of superiority, controlling, imagination, intuition
BROWN: grounding, down to earth, practical, male energies, invalidating, emphasizing body and denying spirit, feeling worth-less
BLACK: issues relating to death, hatred, lack of forgiveness, unresolved karma, dark intentions, shadow games, needing compassion for self
PINK: self-love, tenderness, female energies, gay energies, emphasis on physical appearances, being 'nice' at expense of being 'real'
WHITE (CLOUDY): New Age or religious energy, lacking consciousness, a cover-up, denial, being 'good' at expense of being 'whole'
WHITE (CLEAR LIGHT): very high spiritual vibration, godly, divine, inspiration, seeing spiritual big picture, compassionate
GOLD: high spiritual vibration, integrity, respect, freedom, clearseeing, integrating spirit and body, creating as spirit'
(
http://www.the-auras-expert.com/aura...s-meaning.html)