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The Aerospace – NASA Videomagnetograph began operation one month ago, two years after components were ordered and construction began. The design grew out of a desire to obtain magnetic fields in real time using an optical filter. The aim was to study and analyze magnetic configurations and changes, quantitatively if possible, with high spatial and temporal resolution and as much sensitivity as possible. This instrument is restricted to the line-of-sight component of the magnetic field and is primarily intended for high resolution studies of selected regions of the sun. The rationale behind our approach is shown in the next section and the design details in the following.
Comprehensive studies using X-ray Absorption Fine Structure (XAFS) spectroscopy of the local environments in oxide glasses of alkalis like Na point to the existence of channels of modifying oxide within the glass forming network - a Modified Random Network or MRN. It has been proposed that these are the primary pathways for ionic conduction. Such microsegregation demands a high alkali coordination for non-bridging oxygens. This has now been confirmed from analysis of the O near edge XAFS of silica and sodium disilicate glass. Dielectric relaxation in oxide glasses provides considerable evidence for the cooperative action of alkali ions. The MRN has been used to develop specific microscopic models for ionic transport based on XAFS and incorporating correlated ionic movement. These quantitatively predict the ionic conductivity of silicate and aluminosilicate glasses and the compositional dependence of the activation energy with alkali concentration.
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