Possible composition and climatic changes due to past intense energetic particle precipitation

Details Possible composition and climatic changes due to past intense energetic particle precipitation Possible composition and climatic changes due to past intense energetic particle precipitation

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990angeo...8...87h&link_type=abstract

Annales Geophysicae (ISSN 0992-7689), vol. 8, Feb. 1990, p. 87-96. Research supported by FNRS.

Physics

3

Atmospheric Models, Climate Change, Geomagnetism, Paleoclimatology, Particle Precipitation, Solar Terrestrial Interactions, Atmospheric Composition, Earth Radiation Budget, Magnetic Field Inversions, Photochemical Reactions, Solar Protons

Scientific paper

The composition and climate perturbations caused by intense energetic particle precipitations are studied, with emphasis on the photochemical and climatic response of the atmosphere to particle fluxes. The effects of a solar proton event occurring during a magnetic-field reversal are simulated with a one-dimensional model utilizing the ionization-rate profile observed in 1972. A simulation of the occurrence of a supernova in a sphere of a radius of 10 parsecs centered at the solar system is carried out and discussed. It is demonstrated that both simulations exhibit similar results - the production of odd nitrogen in the stratosphere is significantly enhanced, large ozone depletions are anticipated, along with an increase of the ultraviolet radiation and absorption of visible radiation by NO2. It is noted that perturbed profiles are directly related to the altitude of the maximum energy deposition.

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