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Ionospheric Disturbances and Solar Eruptions

Nature volume 140, page 612 (09 October 1937) | Download Citation



DR. D. F. MARTYN, Messrs. G. H. Munro and A. J. Higgs, and Dr. S. E. Williams, in a communication which appears on page 603, show evidence that a type of ionospheric disturbance accompanies every bright hydrogen solar eruption. The main features of the disturbance are an increase of ionization in the D region and a heating effect in and below the F2 region. When the disturbances are large they cause 'fade-outs' in short-wave communication. It is concluded that these effects are due to a greatly increased emission of the hydrogen resonance line La from the eruptive area. This causes ionization of atomic oxygen in the D region, and dissociates the water vapour in the F2 region, thus raising the equilibrium temperature. Further evidence of a connexion between solar activity and short-wave radio 'fade-outs' is given in the note entitled "An Active Sun-spot" on page 616 of this issue.

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