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What effect accelerates plasma radio-wave propagation in space?

A)Increased electron-ion collision frequency
B)Alfvén wave induced density fluctuations
C)Decreased background magnetic field strength
D)Enhanced ion-acoustic wave damping rates

💡 Explanation

Alfvén waves cause density fluctuations; due to electron MHD, they result in faster propagation. Magnetosonic mechanism causes this, because the non-linear properties of Alfvén resonances modify index of refraction; therefore, waves accelerate, rather than decelerate through collision or simple damping.

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