NASA NTRS · 19730021365
Barium release system
Abstract
A chemical system is described for releasing a good yield of free barium neutral atoms and barium ions in the upper atmosphere and interplanetary space for the study of the geophysical properties of the medium. The barium is released in the vapor phase so that it can be ionized by solar radiation and also be excited to emit resonance radiation in the visible range. The ionized luminous cloud of barium becomes a visible indication of magnetic and electrical characteristics in space and allows determination of these properties over relatively large areas at a given time.
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Lewis, B. W., Stokes, C. S., Smith, E. W., Murphy, W. J.. 1973-08-14. Barium release system. https://ntrs.nasa.gov/citations/19730021365
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