ðə sˈaɪklətɹˌɑːn fɹˈiːkwənsi ɪz ˈɔːlsoʊ jˈuːsfəl ɪn nˈɑːnjˈuːnɪfˌɔːɹm mæɡnˈɛɾɪk fˈiːldz, ɪnwˌɪtʃ ɐsˈuːmɪŋ slˈoʊ vˌɛɹɪˈeɪʃən ʌv mˈæɡnɪtˌuːd ʌvðə mæɡnˈɛɾɪk fˈiːld ðə mˈuːvmənt ɪz ɐpɹˈɑːksɪmətli hˈɛlɪkəl ɪnðə dᵻɹˈɛkʃən pˈæɹəlˌɛl tə ðə mæɡnˈɛɾɪk fˈiːld, ðə mˈoʊʃən ɪz jˈuːnɪfˌɔːɹm, wˈɛɹæz ɪnðə plˈeɪn pˌɜːpəndˈɪkjʊlɚ tə ðə mæɡnˈɛɾɪk fˈiːld ðə mˈuːvmənt ɪz, æz pɹˈiːviəsli sˈɜːkjʊlɚ.
The cyclotron frequency is also useful in non-uniform magnetic fields, in which (assuming slow variation of magnitude of the magnetic field) the movement is approximately helical - in the direction parallel to the magnetic field, the motion is uniform, whereas in the plane perpendicular to the magnetic field the movement is, as previously circular.