Fig. 11.

Earth images from DSCOVR/EPIC for April 9, 2020 showing the superimposed outer circle (white) of clear-sky _Min <T₉₀> less than 65 min and the inner circle (white) for _Min <T₉₀> less than 50 min when D₉₀ = 40 J/m². Sunrise is on the left (west) and sunset is on the right (east). The subsolar point is approximately in the center of the circle slightly offset by the small DSCOVR/EPIC orbital view angle. For the calculated RS SARS CoV-2 D₉₀ = 3.2 J/m², a near-circle (dark-line) with solar zenith angle < 60^O centered on the subsolar point would have _Min <T₉₀> less than 20 min