Accession Number : ADA334829

Title :   Detailed Solar Activity and Ionization Event Records in Polar Ice Caps

Descriptive Note : Final rept. 01 Oct 94-30 Sep 97

Corporate Author : KANSAS UNIV CENTER FOR RESEARCH INC LAWRENCE

Personal Author(s) : Dreschhoff, Gisela A. ; Zeller, Edward J.

PDF Url : ADA334829

Report Date : 30 NOV 1997

Pagination or Media Count : 41

Abstract : Nitrate analyses were made of ice cores taken from high altitude sites on the Antarctic plateau and central Greenland. The 430 year nitrate record from the Greenland ice cap is believed to provide an estimate of the occurrence frequencies and number of major solar flares / solar proton events. The results include: (1) Observed historical white light flares can be expected to be associated with major solar proton events, (2) The SPE's recorded in the nitrate sequence are most likely large proton fluence events originating near the central meridian of the sun as viewed from the earth, (3) Large events occurred at the end of the 18th century, (4) Increased solar activity for several solar cycles preceding deep and prolonged solar minima, (5) Deep minima are recorded in both polar regions, (6) The nitrate record provides an almost complete history of ionospheric conditions in terms of individual ionization events as well as hemispheric or global effects via ionospheric-thermospheric coupling.

Descriptors :   *IONIZATION, *SOLAR ACTIVITY, *POLAR CAP, *NITRATES, *ICE CAPS, FREQUENCY, IONOSPHERE, POLAR REGIONS, GLOBAL, CORES, SITES, PROTONS, SEQUENCES, HIGH ALTITUDE, HEMISPHERES, SOLAR CYCLE, WHITE LIGHT, ANTARCTIC REGIONS, SOLAR FLARES, SUN, GREENLAND, SOLAR COSMIC RAYS, SOLAR DISTURBANCES.

Subject Categories : Astrophysics
      Geology, Geochemistry and Mineralogy
      Snow, Ice and Permafrost

Distribution Statement : APPROVED FOR PUBLIC RELEASE