Figure 9.

Numerical solution to the dimensionless SPDEs with parameters Γ_e=0.87×10⁻³, α=0.001, and periodic boundary conditions in space. At t={0, 5000}, P_ee=11.0 uniform in space. For 500 ms<t<5000 ms P_ee is a Gaussian function in space with maximum $P_{\text{ee}}^{*}$ at x=350 mm and full width at half maximum 46 mm. In subfigure (a), the maximum $P_{\text{ee}}^{*}=\{110.0,210.0,310.0,410.0,510.0\}$ at t={500, 1000, 1500, 2000, 2500} ms, respectively. These increases in $P_{\text{ee}}^{*}$ are denoted by the solid vertical lines. In subfigure (b), the maximum $P_{\text{ee}}^{*}=\{410.0,310.0,210.0,110.0\}$ at t={3000, 3500, 4000, 4500} ms, respectively. These decreases in $P_{\text{ee}}^{*}$ are denoted by the dashed vertical lines. Space (in mm) and time (in ms) are plotted along the vertical and horizontal axes, respectively. The value of h_e is plotted in linear greyscale with h_e=−100 mV in white and h_e=0.0 mV in black. Waves in h_e are localized in space and time to the region of hyperexcitation near x=350 mm for 1800 ms<t<3800 ms.