I found an earlier post from Suryananda discussing these astral zones below.   

Siddhaloka is a holding zone, therefore a variety of activities and practices go on at that level, including reversal of subtle sexual organs, which supports the lack of need for reproduction and sex organs' derived pleasures. 

Maharloka is the rebirth resistance zone.

And, Janaloka is the social resistance zone.

How do these karmic energies operate in these particular zones?