Original PhD Thesis – The Force-Field Approach to Neutron Monitor Observations of the Eleven-Year Cosmic-Ray Modulation Cycle – H. Morall

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Original PhD Thesis – The Force-Field Approach to Neutron Monitor Observations of the Eleven-Year Cosmic-Ray Modulation Cycle – H. Morall

Short Description

Harm Moraal [1947-2015] born in the Netherlands but spent most of his life in his adopted home South Africa where he was Professor of Physics at Potchefstroom University. He became an accepted world authority in Cosmic Rays and a member of the Commission on Cosmic Rays of the International Union of Pure and Applied Physics – now the Commission on Astro-particle Physics – in the 1990’s he was Chair of the Commission. He was involved in numerous other related bodies.

Harm Moraal completed this PhD in December 1973. The work comprises 130 pages reproduced from typescript bound in faux black Morocco, gilt titles to front hand done consistent with the techniques of the period.

This is high level science and of history of science merit. Chapter subjects include :–

Cosmic-Ray Modulation Theory [Development of Equations; Mono-Energetic Solutions; Force-Filed Solutions etc]

The Force-Field Equation Applied to Neutron Monitor Response Functions [Force-Field Equations for a Mixture of Particle; Neutron Monitor Distribution Functions (the Experiments); Validity of the modified convection diffusion approximation etc]

The Force-Field Equation Applied to Measurements of Stationary Neutron Monitors [Fractions Counting Rates etc]

The Modulation of Cosmic-Ray Electrons [Comparison with neutron monitor results and separability of the diffusion coefficient etc]

Various Appendices including – the Rigidity Dependence of the Diffusion Coefficient near the Cosmic-Ray Maximum of May 1965.

Important PhD Thesis by a man who then devoted his life to his subject Cosmic-ray Physicist Harm Moraal .

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