回旋辐射是非相对论性的带电粒子在磁场中受到洛伦兹力的作用产生的辐射。

非相对论电子的回旋辐射的总功率可以表示成：

上式采用高斯单位制，，是电子速率与光速的比；是电子经典半径，α是电子速率与磁场的夹角。可见，非相对论性电子回旋辐射的功率与其能量平方成正比（即与β的平方成正比），与磁场强度的平方成正比。对于具有各向同性速度分布的电子，平均辐射功率：

Cyclotron radiation is electromagnetic radiation emitted by accelerating charged particles deflected by a magnetic field. The Lorentz force on the particles acts perpendicular to both the magnetic field lines and the particles' motion through them, creating an acceleration of charged particles that causes them to emit radiation as a result of the acceleration they undergo as they spiral around the lines of the magnetic field.