Table 3 The identified epochs of rapid SV fluctuations at 2 selected points (at 400 km altitude just above HER and TSU) using the polynomial monthly main field models.
Gradient before [nT/yr2] | Epoch of rapid SV fluctuation | Gradient between the epochs [nT/yr2] | Epoch of rapid SV fluctuation | Gradient after [nT/yr2] | ||
|---|---|---|---|---|---|---|
X | −5.8 | 2003.1 | 14.0 | 2004.1 | −9.9 | |
HER | Y | 2.0 | 2003.4 | −4.7 | 2004.1 | 1.2 |
Z | −12.2 | 2003.0 | 8.4 | 2004.1 | −10.4 | |
X | −8.6 | 2003.1 | 18.4 | 2004.1 | −9.2 | |
TSU | Y | 3 0 | 2003.2 | −4.0 | 2004.3 | 1.9 |
Z | −7.0 | 2002.9 | 3.7 | 2004.0 | −9.4 |