Create README.md

README.md

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+---
+license: artistic-2.0
+task_categories:
+- unconditional-image-generation
+size_categories:
+- 100K<n<1M
+---
+
+250k maps of ionospheric characteristics generated by [IRI-2020](https://irimodel.org/) spanning random dates 1958-2024 and random SSN 0-200 (not the true SSN for that date), with the goal of training a diffusion inpainting model to extrapolate plausible ionospheres.
+
+All maps are 1°x1° gridded, 361x181 with 180°W at the left, 180°E at the right, 90°N at the top, 90°S at the left. IRI settings are `JF(4:6)`, `JF(21:23)`, `JF(28:30)`, `JF(33:36)`, `JF(39:40)`, `JF(47)` false, all other JF true.
+
+Each file contains in PNG metadata `Datetime`: the date/time passed to IRI, as an ISO8601 string, and `Ssn`, the RZ(12) passed to IRI.
+
+`foe` is FoE, scaled to 0 = 0.5 MHz, 255 = 5 MHz.  
+`fof2` is foF2, scaled to 0 = 1.5 MHz, 255 = 15 MHz.  
+`hmf2` is hmF2, scaled to 0 = 150 km, 255 = 450 km.  
+`mufd` is MUF(3000km), scaled to 0 = 5 MHz, 255 = 45 MHz.
+
+`combined` is an fof2 map in rows 0-180, a mufd map in rows 182-362, and an hmf2 map in rows 364-544. The intervening rows are cyan.