Click the flag to render the northern lights. Adjust the detail with the slider. RUN IN TURBO MODE* (shift-click green flag). *No longer necessary.
1/28/2018: Released 1/29/2018: Alpha decay is exponential instead of linear, and added mirroring. 1/29/2018: Fixed (removed) discolored line running thru center. 1/30/2018: Improved overall speed by ~20% and moved most code inside a run without refresh block. 1/30/2018: Massive speed boost, ~50% faster on higher detail settings. 2/4/2018: Added flow mode, works best on lower details.
