Open Access
Table 2
Table showing input features of the model, transformations used (if any), and which models use each feature. The given transformation is only used prior to fitting the Gaussian process model. Box-Cox → B(x) = sgn(x) × loge
x and Erf → erf(x) = 
.
| Features | Symbol | Units | Transformation | Model |
|---|---|---|---|---|
| Anti-sunward component of IMF | B x | nT | Box-Cox | All |
| Transverse component of IMF |
|
nT | Box-Cox | All |
| IMF clock angle |
|
radian | Box-Cox | All |
| Bulk velocity |
|
km s−1 | Box-Cox | All |
| Number density | n | m−3 | Box-Cox | All |
| Electron temperature | T | K | Box-Cox | All |
| Dynamic pressure | P dyn | Nm−2 | Box-Cox | All |
| Mach number | M a | 1 | Box-Cox | All |
| Plasma beta | β | 1 | Erf | All |
| Historical K p |
|
1 | Box-Cox | All |
| Background X-ray | B | Wm2 | None | LSTM
c
, 
|
| X-ray flux ratio | R | 1 | None | LSTM
c
, 
|
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