SR90, strontium shaped-charge critical ionization velocity experiment

Details SR90, strontium shaped-charge critical ionization velocity experiment SR90, strontium shaped-charge critical ionization velocity experiment

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....9521069w&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, Dec. 1, 1990, p. 21069-21075. Previously announced in STAR as N90-216

Physics

15

Calibrating, Computerized Simulation, Critical Velocity, Electron Density (Concentration), Ionization, Shaped Charges, Strontium, Ionization Cross Sections, Ions, Linings, Solar Spectra, Spaceborne Experiments, Time Constant, Velocity Distribution

Scientific paper

In May 1986 an experiment was performed to test Alfven's critical ionization velocity (CIV) effect in free space using a high-explosive shaped charge with a conical liner of strontium metal. The release, made at 540 km altitude at dawn twilight, was aimed at 48 deg to B. The background electron density was 15,000/cu cm. A faint field-aligned Sr(+) ion streak with tip velocity of 2.6 km/s was observed from two optical sites. Using two calibration methods, it was calculated that between 4.5 x 10 to the 20th and 2 x 10 to the 21st ions were visible. An ionization time constant of 1920 s was calculated for Sr from the solar UV spectrum and ionization cross section, which, combined with a computer simulation of the injection, predicts 1.7 x 10 to the 21st solar UV ions in the low-velocity part of the ion streak. Thus all the observed ions are from the neutral jet. The observed neutral Sr velocity distribution and computer simulations indicate that 2 x 10 to the 21st solar UV ions would have been created from the fast (greater than critical) part of the jet. They would have been more diffuse, and were not observed. Using this fact it was estimated than any CIV ions created were fewer than 10 to the 21st. It was concluded that future Sr CIV free space experiments should be conducted below the UV shadow height and in much larger background plasma density.

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