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Table 4. Calibrated accelerometer observations vs. those predicted by models or estimated by POD (nm/s2, σ is RMS-about-mean).

From: Thermospheric density and wind retrieval from Swarm observations

Satellite Date Obs. Obs. vs. estimated Obs. vs. modeled
  2003 signal σ Mean σ Mean σ
X axis       
GRACE-A 7 Nov. 50.9 0.1 18.9 −33.2 21.9
  8 Nov. 40.4 −0.5 19.6 −35.2 22.9
GRACE-B 7 Nov. 48.3 0.2 19.1 36.4 21.4
  8 Nov. 39.1 0.6 19.6 37.4 22.1
CHAMP 7 Nov. 152.4 −0.4 74.3 151.0 69.1
  8 Nov. 127.6 0.4 63.1 150.3 71.7
Y axis       
GRACE-A 7 Nov. 23.8 0.8 13.5 −71.4 2.4
  8 Nov. 21.8 −2.2 16.3 −79.4 2.2
GRACE-B 7 Nov. 23.9 0.6 14.9 −115.9 2.9
  8 Nov. 22.0 9.2 16.1 −113.7 2.1
CHAMP 7 Nov. 41.2 63.4 17.2 36.8 11.4
  8 Nov. 33.0 59.0 18.0 15.0 12.0
Z axis       
GRACE-A 7 Nov. 12.5 7.5 12.8 146.3 4.1
  8 Nov. 12.4 13.6 12.5 153.5 4.0
GRACE-B 7 Nov. 14.4 6.3 14.5 166.3 3.9
  8 Nov. 13.9 −19.1 14.0 130.8 3.7
CHAMP N/A N/A N/A N/A N/A N/A