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Measurement of Aerosols Optical Thickness of the Atmosphere using the GLOBE Handheld Sun Photometer

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Up-down photometers for auroral profile studies.

K A Dick, W G Fastie

|January 16, 2010

Summary

A new ultraviolet rocket photometer system measures light from above and below to determine atmospheric intensities. This helps separate time and space variations, enabling calculation of emission rates for atmospheric studies.

Area of Science:

Atmospheric physics and aeronomy
Remote sensing technologies
Rocket-borne instrumentation

Background:

Understanding atmospheric phenomena requires accurate intensity measurements.
Distinguishing temporal and spatial variations is crucial for atmospheric modeling.
Previous rocket instruments had fixed orientations, limiting observational capabilities.

Purpose of the Study:

To develop and describe a novel ultraviolet rocket-borne photometer system.
To enable the calculation of total vertical column intensity and volume emission rates.
To improve the separation of temporal and spatial variations in atmospheric emissions.

Main Methods:

Utilizing a rocket-borne photometer system capable of alternate zenith and nadir measurements.

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Observing specific spectral features, including the [OI] line at lambda2972 and N2 second positive bands.

Analyzing data to derive vertical column intensities and, where possible, volume emission rates.

Main Results:

Demonstrated the capability to measure zenith and nadir intensities from rocket altitude.
Provided a method for calculating total vertical column intensity.
Successfully flew configurations monitoring key spectral features for atmospheric analysis.

Conclusions:

The described photometer system offers enhanced capabilities for atmospheric research.
The zenith-nadir measurement strategy effectively separates spatial and temporal variations.
Future developments include incorporating additional spectral bands for more comprehensive analysis.