Correspondence Between Densities and Traditional Planes of Existence

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I understand. As you said, the Samaelian Gnosis talks about lunar and solar astral body. The lunar body can go only to middle and lower astral planes. The solar body can go to higher astral. This solar body must be build and I suppose it's the fourth density body.

Q'uo said something like that recently:

Z: I have a query. When a person has a Kundalini rising experience, is that the activation of their fourth-density energy body?

Q’uo: I am Q'uo, and am aware of your query, my brother. The rising of the Kundalini to the indigo ray energy center is that which you may indeed describe as the activation of the fourth-density body, that of the green ray energy center, which is then fully energized to be able to experience the higher vibrations now engulfing your planet so that these vibrations may be shared, or channeled, and transmitted to those about the entity experiencing the so-called Kundalini experience. For though an experience which seems solitary in nature, and, indeed, is experienced in this manner, it is one which offers the opportunities for the expansion of consciousness for others with whom the entity experiencing it shall come in contact.

I see the other densities as other octaves. The fourth density planes (space/time and time/space) are from another vibration above the yellow octave. So, we can't go to the fourth density, it's necessary to have a fourth density body. As the astral plane is the sub-density of fourth, for this reason I supposed fourth density has astral characteristics. For example, Ra said that in fifth density the entity function only by thought. That's the same description of the mental plane of the traditions.

Edit: Intersting passage of "Autobiography of an Iogue" when the deceased master of Yogananda appears to him in which seems a fourth density body. He talks about an "astral planet" and a new body:

Source: http://yogananda.com.au/aoy/beyond_death_1.html