This can be achieved by starting without horizontal momentum and pressing jump and then forward while still holding jump (or repressing jump).
These inputs can be done in rapid succession or with a short delay.
Shinesparking in water can be done the same way, but requires a slightly longer delay between the jump and forward presses.
If needing to spark near ground level, avoid being crouched when pressing jump, as crouch jumping will boost Samus vertically and result in a higher position for the spark.
See also: Tech Page