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IJRSP Vol.35(2) [April 2006] >


Title: Evening twilightglow of sodium 5893Å line emission at Calcutta and its typical relation with astronomical parameters
Authors: Midya, S K
Chattopadhyay, R
Keywords: Twilightglow
Sodium 5893Å line emission
Airglow emission lines
Issue Date: Apr-2006
Publisher: CSIR
Abstract: Sodium line (5893 Å) represents one of the most important airglow emission lines. The photometric observations of evening twilightglow for this line were taken at Narendrapur (Lat. 22°35' Long. 88°21'E), a town in extended Calcutta, during the period between 1983 and 1988. Two distinctly recognizable enhancements or peaks were found to exist in time-versus-emission-intensity curve in evening twilight. One enhancement around sunset and the other a few minutes later were found to be a regular feature in everyday observation. On plotting the time of occurrence of the first peak relative to the sunset time for a complete month we obtained a sinusoidal curve having its troughs and crests coinciding with the different phases of the moon. This observation shows that the time of occurrence of the peak depends on the moon's age.
Page(s): 77-83
ISSN: 0367-8393
Source:IJRSP Vol.35(2) [April 2006]

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