RT Journal Article
SR Electronic
T1 Anomalous Abundance of Upper Atmosphere Sodium, 1964
JF Science
JO Science
FD American Association for the Advancement of Science
SP 736
OP 737
DO 10.1126/science.147.3659.736
VO 147
IS 3659
A1 Burnett, C. R.
YR 1965
UL http://science.sciencemag.org/content/147/3659/736.abstract
AB Measurements of atomic sodium in the upper atmosphere by absorption spectroscopy with the Pepsios spectrometer on the Fraunhofer D2 line during February to August 1964 at Madison. Wisconsin, have indicated abundances of about 1010/cm2 for the late winter, about twice the values from a similar method in 1961-62. An abrupt decrease in abundance occurred during March in agreement with established seasonal behavior, but the abundance then increased anomalously in the summer to 8 x 109/cm2. The summertime increase may be related to observations of increased turbidity of the upper atmosphere, presumably caused by volcanic dust.