Sensitivity of the auroral zones to temporal changes in Earth’s internal magnetic field | Journal of Space Weather and Space Climate

Topical Issue - Swarm 10-Year Anniversary

Open Access

Table 2

Changes in auroral zones surface area, A_N (first row) and A_S (second row), between 2015 and 2020 AD. The second column reports the first-difference estimate from A_i calculated using the IGRF-13 model (analogous to formula (4)). The third column reports the estimates obtained by integrating geographical sources of change over the CMB (top panels of Fig. 7).

Hemisphere	2015–2020 variation, ${\dot{A}}_{i}$ ${\dot{A}}_i$	Green’s function estimate, $\frac{\partial A_{i}}{\partial t}$ $\frac{\partial {A}_i}{{\partial t}}$
North	−3085 km²/yr	−3151 km²/yr
South	2510 km²/yr	2630 km²/yr

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