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. 2020 Oct 7;7(10):e2020EA001164. doi: 10.1029/2020EA001164

Figure 1.

ess2649-fig-0001

The pathlength matrix used in the symmetric airglow assumption for the red line observation on ICON/MIGHTI. The m index is for the mth LOS, and the n index is for the nth altitude layer. The gray area (representing 0 values) is for the invalid cases where m < n. The diagonal elements of the matrix are for the case when the LOS goes through the tangent layer, m = n. The path length of m = n case is significantly longer than the m ≠ n cases. For instance, wmn = 348 km when m = n = 30, while wmn = 150 km when m = 30 and n = 29.