Soul Force

http://images4.wikia.nocookie.net/streetfighterex/images/7/75/Allensforce.png

Arika's first developement of "fireball motion" before Ryu's prototype model, Allen. Soul Force's sprite is remap of yellow color based from Hadoken's original color in blue.

Fire Force
Another developement of Shinku Hadoken was created after the Soul Force was given to Allen. Soul Force is far more powerful than Shinku Hadoken than can be damage on the opponent with it's fire effect.