Pulsating aurora induced by upper atmospheric barium releases

Details Pulsating aurora induced by upper atmospheric barium releases Pulsating aurora induced by upper atmospheric barium releases

May 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977natur.267..135d&link_type=abstract

Nature, vol. 267, May 12, 1977, p. 135, 136. NSF-NASA-supported research.

Physics

2

Aerial Explosions, Auroral Spectroscopy, Barium Ion Clouds, Upper Atmosphere, Atmospheric Radiation, Electron Precipitation, Pulsed Radiation

Scientific paper

The paper reports the apparent generation of pulsating aurora by explosive releases of barium vapor near 250 km altitude. This effect occurred only when the explosions were in the path of precipitating electrons associated with the visible aurora. Each explosive charge was a standard 1.5 kg thermite mixture of Ba and CuO with an excess of Ba metal which was vaporized and dispersed by the thermite explosion. Traces of Sr, Na, and Li were added to some of the charges, and monitoring was achieved by ground-based spectrophotometric observations. On March 28, 1976, an increase in emission at 5577 A and at 4278 A was observed in association with the first two bursts, these emissions pulsating with roughly a 10 sec period for approximately 60 to 100 sec after the burst.

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