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Source of Global Scale Variations in the Midday Vertical Content of Ionospheric Metal IonsAn analysis of long baseline NIMBUS 7 SBUV (Solar Backscatter UV Spectrometer) observations of the latitudinal variation of the noontime vertical Mg' content above approx. 70 km have revealed seasonal, solar activity and magnetic activity dependencies in the Mg+ content. The distributions were categorized in terms of magnetic coordinates partially because transport processes lifting metallic ions from the main meteor ionization layer below 100 km up into the F- region and down again are controlled by electrodynamical processes. Alternatively, the Nimbus Mg+ distributions may simply be a result of ion/neutral chemistry changes resulting from atmospheric changes and not dynamics. In such a case magnetic control would not dominate the distributions. Using in situ satellite measurements of metal ions from the Atmosphere Explorer satellites in the region above the main meteor layer and published sounding rocket measurements of the main metallic ion layers, the effects of the dynamics on the vertical content are delineated. The consequences of atmospheric changes on the vertical content are explored by separating the Nimbus measurements in a geodetic frame of reference.
Document ID
Document Type
Conference Paper
Joiner, J. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Grebowsky, J. M. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Pesnell, W. D. (Nomad Research, Inc. Bowie, MD United States)
Aikin, A. C. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Goldberg, Richard A. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Date Acquired
August 19, 2013
Publication Date
January 1, 1999
Subject Category
Meeting Information
American Geophysical Union Fall Meeting(San Francisco, CA)
Distribution Limits
Work of the US Gov. Public Use Permitted.