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Atmospheric Ionization by Solar Particles Detected by Nitrate Measurements in Antarctic Snow. FY91 AASERTThe 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 (less than 50 deg), and polar regions (greater than 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.
Document ID
19970004783
Acquisition Source
Legacy CDMS
Document Type
Contractor or Grantee Report
Authors
Vitt, Francis M.
(Kansas Univ. Center for Research, Inc. Lawrence, KS United States)
Jackman, Charles H.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Date Acquired
August 17, 2013
Publication Date
November 30, 1995
Subject Category
Geophysics
Report/Patent Number
AD-A308179
AFOSR-TR-96-0223
Accession Number
97N12809
Funding Number(s)
PROJECT: AF Proj. 3484
CONTRACT_GRANT: F49620-92-J-0235
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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