A high voltage capacitor is charged and then the two leads are shorted together generating a spark, simultaneously a nearby radio crackles. This shows us that when the spark was generated radio waves was also generated. These primitive radio waves are sometimes called hertzian waves. A bolt of lightning also generates hertzian waves. My question is about the nature of the waves produced. When a bolt of lightning strikes the ground dose it produce a predominant frequency wave along with its harmonics? Let me explain with an analogy, a stretched wire when plucked produces a fundamental pitch but simultaneously pitches are produced which are harmonic multiples of the fundamental pitch. If a stretched wire produced a fundamental pitch of 100hz then it will also produce pitches of 200, 300, 400hz etc When a hertzian wave is produced dose it also have a fundamental wavelength along with harmonics which are multiples of the first?