This is a schematic drawing the rockets orientation is unrelated to the velocity vector.
The drawing shows angle of the rocket at the start of its flight, which it would follow without the guidance system (left straight line) and the (theoretical) angle the rocket could have been launched at to hit the plane at the "meeting point" (lower straight line).
The angle of the rocket in this drawing is along the direct hit line most likely to symbolise it is aiming at the plane...
I don't think they would have specified that the angle alpha (angle of attack) is needed. – LandonZeKepitelOfGreytBritn
despite what the text may or may not say:
- alpha is not the angle off attack.
The angle off attack is between the plane and the rocket at the moment of impact.
alpha (as shown in the drawing) is the difference in angle between the real rocket launch angle and the angle between the launch facility and the plane in the moment of impact.
It may be that this is referred to as the angle of attack in military speech but that's wrong in the physical sense.
alpha is very much the angle of attack. it is the angle at which the body "attacks" the air, i.e. the angle between the forward axis of the vehicle and the direction of the incoming stream of air. The "moment of impact" has nothing to do with it. – Federico
You are right with your definition of angle of attack as we use it in aviation.
But the drawing has no indication of the "the direction of the incoming stream of air* (other than implicit from the rockets movement) and even if it would it would not relate the angle alpha as it is drawn since this would be unrelated to the targets movement. But in the drawing the angle alpha is related to the targets movement.