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Development of a spectrometer system to remotely sense mesospheric temperature.
Norwegian University of Science and Technology, Faculty of Natural Sciences and Technology, Department of Physics.
2011 (English)MasteroppgaveStudent thesis
Abstract [en]

At nighttime the strongest source of radiation is the hydroxyl night glow. By measuring the different lines within a band it is possible to calculate the temperature of the mesosphere more than 85km above ground. In order to do this a spectrometer system has been calibrated and software has been developed. The software include a program to control the spectrometer and automatically take data spectra through the night, and a program to process the result and calculate the temperature. Two measurements were done, the (3,1) and (4,2) bands the night of 31. march 2011 and the (7,4) and (8,5) bands the night of 6. may 2011. Both of them were done at NTNU Trondheim (latitude: 63.4 degrees and longitude: 10.4 degrees). The temperature found was 201.85K +/− 3.55K for the (3,1) band, 205.11K +/− 17.94K for the (4,2) band, 199.63K +/− 29.86K for the (7,4) band and 196.37K +/− 8.41K for the (8,5) band. Since the (7,4) and (8,5) bands were measured later than the (3,1) and (4,2) bands, they should be colder. The predicted temperature was also calculated using a program developed at The British Antarctic Survey that uses the MSIS-E-00 [Picone et al., 2003] model for the background atmosphere. The predicted temperatures were 202.3K for the (3,1) band, 201.7K for the (4,2) band, 176.5K for the (7,4) band and 176.4K for the (8,5) band. The predicted temperature and measured temperature are almost the same for the (3,1) and (4,2) bands while it is about 20-25K lower for the (7,4) and (8,5) bands.

Place, publisher, year, edition, pages
Institutt for fysikk , 2011. , 80 p.
Keyword [no]
ntnudaim:6482, MFY Fysikk,
URN: urn:nbn:no:ntnu:diva-14590Local ID: ntnudaim:6482OAI: diva2:456227
Available from: 2011-11-14 Created: 2011-11-14

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