I train a form of chi gung and have experienced both the hair raising and also the opening of the pores. Both seem to be energetic phenomenon associated with the energy body on a physiological level.
As for conscious "control" of the phenomenon, i notice when I sit up straight, or while standing, focus on slightly sitting down, and standing up at the same time I can produce the hair raising feeling up the back of my neck to my crown.
I experience all the phenomenon you stated while doing the chi gung standing meditation. These are signs of the bodies energy system being 'turned on' and 'tuned'.
pharmakeia
As for conscious "control" of the phenomenon, i notice when I sit up straight, or while standing, focus on slightly sitting down, and standing up at the same time I can produce the hair raising feeling up the back of my neck to my crown.
I experience all the phenomenon you stated while doing the chi gung standing meditation. These are signs of the bodies energy system being 'turned on' and 'tuned'.
pharmakeia