Physics
Scientific paper
Jul 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984iue..prop.1912w&link_type=abstract
IUE Proposal ID #MGGJW
Physics
Scientific paper
The distribution of metal ions such as Mg+ Fe+, Na+, Ca+, and Si+ in the terrestrial ionosphere has been studied experimentally through ground-based and satellite observations since 1958. These ions occur in thin layers at altitudes near 90 km and are believed to be deposited in the atmosphere by meteor sputtering and ablation. The results of observations and recent theoretical work show that the distribution of Mg+ is controlled by dynamical processes such as ion neutral collisions, and E x B drift motions. A study of the spatial and temporal variations in the Mg+ distribution can yield information on these dynamical processes. Measured intensities of the 2800A line of "g+ in the daytime ranged from 100 to 500 P. It is proposed that these natural emissions be observed by the IUE satellite during two observational periods of eight hours each. Two periods are needed to allow for some experimentation with spacecraft tracking rates and observing patterns. In addition, it is hoped that these observations will lay the ground work for observations of an artificial Mg+ cloud to be released during the CBBES program in 1986. The IUE spacecraft offers the unique capabilities to observe UV emissions which is the only strong emission signature to be used for remote sensing of magnesium.
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