Inter-hemispheric comparisons of SPE-associated Impulsive Nitrate Enhancements in Polar Ice

Details Inter-hemispheric comparisons of SPE-associated Impulsive Nitrate Enhancements in Polar Ice Inter-hemispheric comparisons of SPE-associated Impulsive Nitrate Enhancements in Polar Ice

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsh33b..09k&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SH33B-09

Physics

7514 Energetic Particles (2114), 7974 Solar Effects, 0342 Middle Atmosphere: Energy Deposition (3334), 0724 Ice Cores (4932), 2479 Solar Radiation And Cosmic Ray Effects

Scientific paper

Several studies have suggested an association between impulsive nitrate enhancements observed in polar ice and solar proton events (SPEs). However, the validity of this association is still the subject of some controversy. One difficulty in addressing this controversy is the inherently high noise level of unconsolidated firn, which typically constitutes the top few tens of meters of ice cores. This high noise level hampers identification of impulsive nitrate enhancements during the space-age, when routine solar proton measurements are available. To overcome this difficulty we examine cores from both hemispheres, including Summit (Greenland), Windless Bight (Antarctica) and Law Dome (Antarctica). Cross-correlation of the cores reduces the effect of local noise and also provides a picture of the global response and insight into seasonal dependencies. We will compare our list of globally observed impulsive nitrate enhancements to the solar proton record.

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