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SOIR data workshop SOIR Exercises A.C. Vandaele, R. Drummond, A. Mahieux, S. Robert, V. Wilquet SOIR Team @ Belgian Institute for Space Aeronomy (IASB-BIRA)

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SOIR data workshop Overview Data overview tool (Orbit_Order) Plot Occultation tool (PlotOccultationPDS_0) Synthetic spectrum construction

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SOIR data workshop SOIR tools (1) Exercise 1: Find two orbits, one close to the equator and one close to the pole, for which CO 2 626 has been measured simultaneously in transition band 21103-00001 (orders 141, 142, 143) – low altitude 21102-00001 (orders 148, 149, 150) – mid altitude 10011-00001 (orders 164, 165, 166) – high altitude Exercise 2: Find orbits for which the HDO/H 2 O ratio can be calculated, i.e. H 2 O and HDO has been measured simultaneously. Check if the latitude dependence can be studied. HDO: orders 119 to 124 H 2 O: orders 167 to 172 Check if the altitude range overlap using the PlotOccultationPDS_0 tool.

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SOIR data workshop SOIR tools (2) Exercise 3: Find orbits for which the CO volume mixing ratio can be calculated simultaneously with the HCl volume mixing ratio, and who were measured between 60 and 80°N. CO: orders 187 to 192 HCl: orders 127 to 132 CO 2 : orders 141 to 143 and 148 to 151 Check if the altitude range where the species absorb in each orbit overlap using the PlotOccultationPDS_0 tool. Check if the detector temperature was below 88 K.

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SOIR data workshop Synthetic spectra construction (1) Exercise 4: The CO 2 main isotopologue 626 21102-00001 vibrational transition band absorbs in diffraction order 149. Using the precalculated absorption cross section (ACS) from file (under Matlab) or (CSV file), reconstruct the synthetic spectrum using 5 adjacent orders (147 to 152).

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SOIR data workshop Synthetic spectra construction (2) 4.1. Determine the wavenumber range in each order 4.2. Calculate the ACS in each order 4.3. Multiply by the blaze function in each order 4.4. Multiply by the AOTF function in each order 4.5. Convolve the spectrum 4.6. Sum the orders 4.7. Make the same operation with the denominator (ACS = 1) 4.8. Perform the division Data: n CO2 = 10 18 molec/cm 3 T = 200 K p = 0.01 bar Path length = 100 km Instrument resolution = 0.15 cm -1 Pixel to wavenumber relation

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SOIR data workshop Thank you for your attention

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