Interhemispheric observations of impulsive nitrate enhancements associated with the four large ground-level solar cosmic ray events (1940-1950)

Details Interhemispheric observations of impulsive nitrate enhancements associated with the four large ground-level solar cosmic ray events (1940-1950) Interhemispheric observations of impulsive nitrate enhancements associated with the four large ground-level solar cosmic ray events (1940-1950)

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009jastp..71.1840k&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 71, Issue 17-18, p. 1840-1845.

Physics

1

Solar Proton Events, Ice Cores, Solar Cosmic Rays, Gle, Nitrates, Solar Flares

Scientific paper

We present a compelling similarity of impulsive nitrate enhancements observed in polar ice from the northern and southern hemispheres. This analysis concentrates on the period 1940-1950, during which time the first four recorded solar cosmic ray ground-level enhancements (GLEs) occurred. GLEs are strong solar proton events. We show that large and sudden enhancements in the nitrate records from both hemispheres were observed within weeks following the recorded solar cosmic ray ground-level event. The observation of impulsive nitrate enhancements simultaneously in both hemispheres shortly after a large fluence solar proton event is strong evidence in support of a causal connection and argues strongly for rapid transport of atmospheric nitrates generated through the polar atmosphere by energetic solar proton events.

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