Abstract
THE proper formulation of a theory of propagation of disturbance from the Sun to Earth must rest upon knowledge of the magnetic field and material density of the intervening space. An interplanetary density, at the Earth's orbit, of order 103 protons and electrons per cm.3 has been frequently assumed for theoretical purposes. There is now growing evidence that the density is considerably lower than this.
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COLE, K. Solar Terrestrial Relationships. Nature 186, 874 (1960). https://doi.org/10.1038/186874a0
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DOI: https://doi.org/10.1038/186874a0
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