What causes a bow shock?

In astrophysics, a bow shock occurs when the magnetosphere of an astrophysical object interacts with the nearby flowing ambient plasma such as the solar wind. For Earth and other magnetized planets, it is the boundary at which the speed of the stellar wind abruptly drops as a result of its approach to the magnetopause.

What is a bow wave in physics?

bow wave, progressive disturbance propagated through a fluid such as water or air as the result of displacement by the foremost point of an object moving through it at a speed greater than the speed of a wave moving across the water.

What is Earth’s bow shock?

Due to the interaction of the permanent incoming solar wind (coming from the left of the figure) with the Earth’s magnetosphere, a permanent collisionless shock called a bow shock (yellow arc) is formed in front of the nose of the magnetopause, the external boundary layer of the magnetosphere.

Which mission passed the bow shock in the universe?

Voyager 2 passed the termination shock in 2007; its passage across the heliopause means that it is now sensing the interstellar medium and is beyond the reach of the solar wind.

What is Saturn’s bow shock?

The bow shock is a discontinuity that forms in the solar wind when the supersonic solar wind encounters the magnetic field of a planet, very similar to the shock wave that forms upstream of an aircraft moving at a supersonic speed.

What is wave drag in aerodynamics?

Wave Drag is a force, or drag, that retards the forward movement of an airplane, in both supersonic and Transonic Flight, as a consequence of the formation of shock waves.

What is attached shock wave?

[ə′tacht ′shäk ‚wāv] (fluid mechanics) An oblique or conical shock wave that appears to be in contact with the leading edge of an airfoil or the nose of a body in a supersonic flow field. Also known as attached shock.

What are shock waves made of?

shock wave, strong pressure wave in any elastic medium such as air, water, or a solid substance, produced by supersonic aircraft, explosions, lightning, or other phenomena that create violent changes in pressure.

What is Angle for bow shock?

The angle θBn between the upstream magnetic field and the shock normal is different in different bow shock locations. The angle θBn is one of the main shock parameters according to which shocks are classified as quasiperpendicular θBn > 45° and quasiparallel θBn ≤ 45°.

What is a bow shock in astronomy?

In astrophysics, a bow shock occurs when the magnetosphere of an astrophysical object interacts with the nearby flowing ambient plasma such as the solar wind. For Earth and other magnetized planets, it is the boundary at which the speed of the stellar wind abruptly drops as a result of its approach to the magnetopause.

How does a bow shock become an acoustic wave?

Of course, real bodies have a finite length, and in the process of termination generate expansion waves that interact with, and weaken, the bow shock. Thus, a bow shock becomes an acoustic wave far from the body that generated it.

What is the thermodynamic transformation across a bow shock?

The thermodynamic transformation across a bow shock is non-isentropic and the shock decreases the flow velocity from supersonic velocity upstream to subsonic velocity downstream. The bow shock significantly increases the drag in a vehicle traveling at a supersonic speed.

What is the difference between oblique and bow shocks?

Then, the oblique shock transforms in a curved detached shock wave. As bow shocks occur for high flow deflection angles, they are often seen forming around blunt bodies, because of the high deflection angle that the body impose to the flow around it.