For a satellite in a Molniya orbit, large impulse is required for orbital plane change.

Basic Orbital Maneuvers topics include: Orbital maneuvers, hohmann transfer, in-plane and out-of-plane orbit changes, impulsive and non-impulsive maneuvers. Here are some basic orbital maneuvers: Hohmann transfer: A classical maneuver that changes the orbital altitude. It involves two impulse maneuvers, one at perigee and one at apogee. Orbit transfer: A transfer orbit is needed to move a spacecraft between two orbits that don't intersect. Changing inclination: Also known as an orbital plane change, this maneuver changes the inclination of an orbiting body's orbit. It requires a change in... Show more

Basic Orbital Maneuvers topics include: Orbital maneuvers, hohmann transfer, in-plane and out-of-plane orbit changes, impulsive and non-impulsive maneuvers.

Here are some basic orbital maneuvers:
Hohmann transfer: A classical maneuver that changes the orbital altitude. It involves two impulse maneuvers, one at perigee and one at apogee.
Orbit transfer: A transfer orbit is needed to move a spacecraft between two orbits that don't intersect.
Changing inclination: Also known as an orbital plane change, this maneuver changes the inclination of an orbiting body's orbit. It requires a change in the orbital velocity vector at the orbital nodes.
Impulsive maneuver: A mathematical model of a maneuver that's an instantaneous change in a spacecraft's velocity.
Propulsion system: A spacecraft's primary mobility system that helps with maneuvering operations like orbit changing and orientation.
Radial in and radial out: These vectors are parallel to the orbital plane and perpendicular to the prograde vector. The radial vector points inside the orbit, while the anti-radial vector points outside the orbit. 
 

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