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Earth, Planets and Space

Table 1 Parameters used in data weighting

From: The Mag.num core field model as a parent for IGRF-13, and the recent evolution of the South Atlantic Anomaly

 

Sat

Obs

LM

HL

LM

HL

A

B

C

 

A

B

C

   
 

\(\sigma \)

 

k

a

 

\(\sigma \)

 

k

a

\(\sigma \)

k

a

\(\sigma \)

k

a

X

3.4

3.4

3.4

1.1

1.0

11.0

11.0

11.0

0.65

0.4

3.9

1.0

0.6

8.4

0.65

0.4

Y

3.0

3.0

3.0

1.1

1.0

11.0

10.0

9.0

0.65

0.4

3.9

1.0

0.6

8.0

0.65

0.4

Z

3.0

3.5

3.5

3.1

1.0

8.0

8.0

8.5

0.85

0.4

6.0

1.0

0.6

11.3

0.70

0.3

  1. Sat and Obs stand for satellite and observatory data, LM indicates the low- and mid-latitude subset and HL the high-latitude subset (see "Satellite data selection" section). Parameters k and a refer to the applied modified Huber norm for the X, Y and Z component data (Eq. 11). The standard deviations \(\sigma \) (in nT) for the satellite data are given separately for Swarm satellites A, B and C
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