Evidence of individual solar proton events in Antarctic snow

Details Evidence of individual solar proton events in Antarctic snow Evidence of individual solar proton events in Antarctic snow

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990soph..127..333d&link_type=abstract

(Sun in Time Conference, Tucson, AZ, Mar. 6-10, 1989) Solar Physics (ISSN 0038-0938), vol. 127, June 1990, p. 333-346.

Physics

15

Antarctic Regions, Atmospheric Ionization, Charged Particles, Nitrates, Snow Cover, Solar Protons, Chemical Composition, Land Ice, Nitrogen Oxides, Ross Ice Shelf, Upper Atmosphere

Scientific paper

The nitrate concentration in a drilled firn core in Antarctica was measured via ultraviolet spectrophotometry under tightly controlled experimental conditions. Uninterrupted high-resolution sampling revealed that nitrate concentration variations averaged about 53 percent of the mean concentration for the entire core. The time series produced from 1393 individual analyses reveals a statistically significant background signal modulation that is due to solar activity. Large concentration peaks correlating with major solar proton events of August 1972, July 1946, and the white-light flare of July 1928 were observed.

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