Model
Digital Document
Publisher
Florida Atlantic University
Description
Measurements of the rate of change of twilight glow were made at a fixed
zenith angle with a Pepsios spectrometer at Boca Raton, Florida and
Fritz Peak, Colorado in 1973. The twilight derivative may be represented
by the convolution of a vertical sodium distribution function and the
derivative of an atmospheric transmission function. Computer calculations
of the convolution were made with artificial sodium density distributions
for comparison with observed intensity changes. Na layer was found to be 88 +- 6 km for the Florida data and 89 +- 8 km for the Colorado data. The computed distributions were similar to those
found by other observers. The average half width from Florida was found
to be 3 km greater than that from Colorado. The 3 km difference was
about two times the standard deviation and it may reflect either a seasonal
or geographic effect.
zenith angle with a Pepsios spectrometer at Boca Raton, Florida and
Fritz Peak, Colorado in 1973. The twilight derivative may be represented
by the convolution of a vertical sodium distribution function and the
derivative of an atmospheric transmission function. Computer calculations
of the convolution were made with artificial sodium density distributions
for comparison with observed intensity changes. Na layer was found to be 88 +- 6 km for the Florida data and 89 +- 8 km for the Colorado data. The computed distributions were similar to those
found by other observers. The average half width from Florida was found
to be 3 km greater than that from Colorado. The 3 km difference was
about two times the standard deviation and it may reflect either a seasonal
or geographic effect.
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