Does Earth's magnetic field or solar activity influence the El Nino cycle?

Not that we know. The data on El Nino cycles is too sparse to search for statistical correlations with other physical mechanisms. The most likely place to look for correlations would be within the Earth's ocean-atmosphere system which is a complex 'pendulum' in and of itself. Solar influences may be relevant, but there is not enough El Nino historical data to tease-out any correlation, let alone use this to establish a cause and effect relationship at this time.

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All answers are provided by Dr. Sten Odenwald (Raytheon STX) for the