Accession Number : ADA308179

Title :   Atmospheric Ionization by Solar Particles Detected by Nitrate Measurements in Antarctic Snow. FY91 AASERT.

Descriptive Note : Final rept. 1 Jun 92-30 Nov 95,

Corporate Author : KANSAS UNIV LAWRENCE DEPT OF PHYSICS AND ASTRONOMY

Personal Author(s) : Vitt, Francis M. ; Jackman, Charles H.

PDF Url : ADA308179

Report Date : 30 NOV 1995

Pagination or Media Count : 37

Abstract : The odd nitrogen source strengths associated with solar proton events (SPEs), galactic cosmic rays (GCRs), and the oxidation of nitrous oxide in the Earth's middle atmosphere from 1974 through 1993 have been compared globally, at middle and lower latitudes (< 50 deg), and polar regions (> 50 deg) with a two-dimensional (2-D) photochemical transport model. As discovered previously, the oxidation of nitrous oxide dominates the global odd nitrogen source while GCRs and SPEs are significant at polar latitudes. The horizontal transport of odd nitrogen, produced by the oxidation of nitrous oxide at latitudes < 50 deg, was found to be the dominant source of odd nitrogen in the polar regions with GCRs contributing substantially during the entire solar cycle. The source of odd nitrogen from SPEs was more sporadic; however, contributions during several years (mostly near solar maximum) were significant in the polar middle atmosphere. p4

Descriptors :   *PARTICLES, *SNOW, *IONIZATION, *SOLAR ACTIVITY, *ANTARCTIC REGIONS, *EARTH ATMOSPHERE, *NITRATES, MESOSPHERE, POLAR REGIONS, MEASUREMENT, MODELS, PHOTOCHEMICAL REACTIONS, OXIDATION, TRANSPORT, HORIZONTAL ORIENTATION, SOLAR CYCLE, NITROUS OXIDE, TEMPERATE REGIONS, LATITUDE, GALACTIC COSMIC RAYS, SOLAR COSMIC RAYS, SOLAR DISTURBANCES.

Subject Categories : Atmospheric Physics
      Astrophysics
      Inorganic Chemistry
      Snow, Ice and Permafrost

Distribution Statement : APPROVED FOR PUBLIC RELEASE