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Sodium twilight emission measured with a tilting filter photometer |
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| Authors: | G Visconti G Fiocco |
| Institution: | (1) Università, L'Aquila, Italy;(2) European Space Research Institute, Casella Postale 64, 00044 Frascati (Rome), Italy |
| Abstract: | Summary In this note we report preliminary measurements of sodium twilight emissions showing the variation of theD
2
/D
1
ratio during twilight at solar depression angles  as low as 3.5°. |
| Keywords: | |
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