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As a better-safe-than-sorry precaution, the spacecraft was pointed with its big radio facing forward, like a shield. Not only was there nothing catastrophic, there was hardly anything at all. The few clicking sounds were generated by dust the size of cigarette smoke particles about a micron, or one-25,000th of an inch, in diameter. To be clear Cassini did not actually hear.

Found patter was likely oscillations of charged particles in the upper part of Saturn’s sphere where atoms are broken apart by solar and cosmic radiation. The louder tone were almost certainly "whistler mode emissions” when the charged.