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Table 1 Differences (in pixel) of the center of interference fringes obtained by FP01–FP04 for 3 days

From: Measurement of thermospheric temperatures using OMTI Fabry–Perot interferometers with 70-mm etalon

  FP01
2011/2/1 2011/12/21 2012/11/7
|N–S| (0.04, 0.02) (0.07, 0.00) (0.05, 0.00)
|E–W| (0.06, 0.00) (0.01, 0.00) (0.00, 0.01)
|NS–EW| (0.01, 0.03) (0.01, 0.00) (0.02, 0.00)
|L–NS| (0.21, 0.90) (0.25, 0.95) (0.19, 1.29)
|L–EW| (0.22, 0.87) (0.23, 0.95) (0.23, 1.39)
Average sigma (K) 26.34018 28.69704 27.21892
  FP02
2010/12/23 2010/12/24 2012/9/24
|N–S| (0.67, 0.09) (0.05, 0.16) (0.07, 0.05)
|E–W| (0.03, 0.09) (0.05, 0.14) (0.09, 0.07)
|NS–EW| (2.63, 6.41) (2.38, 6.36) (2.33, 6.20)
|L–NS| (0.35, 1.00) (0.07, 1.13) (0.30, 0.36)
|L–EW| (2.28, 7.41) (2.45, 7.49) (2.63, 6.55)
Average sigma (K) 17.37568 16.06653 18.1809
  FP03
2010/10/16 2011/2/9 2011/4/6
|N–S| (0.15, 0.25) (0.01, 0.02) (0.07, 0.11)
|E–W| (0.12, 0.02) (0.06, 0.05) (0.06, 0.49)
|NS–EW| (0.42, 1.32) (0.31, 1.25) (0.32, 1.81)
|L–NS| (0.60, 1.31) (0.28, 1.15) (0.09, 1.09)
|L–EW| (0.18, 0.02) (0.04, 0.11) (0.57, 0.72)
Average sigma (K) 21.00218 17.52931 38.39434
  FP04
2011/12/6 2012/11/23 2012/1/3
|N–S| (0.08, 0.11) (0.03, 0.04) (0.03, 0.08)
|E–W| (0.04, 0.07) (0.07, 0.07) (0.03, 0.01)
|NS–EW| (3.75, 6.22) (3.74, 6.28) (3.65, 6.06)
|L–NS| (5.00, 7.59) (4.61, 6.99) (5.03, 7.41)
|L–EW| (1.25, 1.27) (0.88, 0.71) (1.38, 1.36)
Average sigma (K) 22.06626 24.60057 11.01532