A regional space weather hazard variation index utilising Swarm FAST data | Journal of Space Weather and Space Climate

Topical Issue - Swarm 10-Year Anniversary

Open Access

Figure 3

The normalized annual magnetic variation of ${\bar{σ}}_{F_{s}}$ ${\overline{\sigma }}_{{F}_s}$ according to equation (4), with that of the quiet year 2020, using magnetic field intensity measurements from Swarm B as in Figure 2. $Δ {\bar{σ}}_{F_{s}} = 1$ $\Delta {\overline{\sigma }}_{{F}_s}=1$ (yellow) when the yearly binned variation is equal to that of 2020. $Δ {\bar{σ}}_{F_{s}} > 1$ $\Delta {\overline{\sigma }}_{{F}_s}>1$ (green–blue) when the variation is greater than 2020 and $Δ {\bar{σ}}_{F_{s}} < 1$ $\Delta {\overline{\sigma }}_{{F}_s} < 1$ (orange) when the variation is less than in 2020.

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