Loop Oscillator Frequency
The solar clock ticks very slowly: once every eleven years, which according to the graph of terrestrial oscillators requires a very long loop. Cepheid variable stars show periods of from three to fifty days, RR Lyrae stars a day or less, and pulsars thousands of times a second.
Thus the hierarchy of spirals is also a range of alternators. Judging by their radio emissions even comets fit in.