>>1509415i just played around on the website and figured it out.
where it's green you're seeing the earth actually being illuminated by the sun and where it's grey they're applying night vision correction to the video. the line is just the edge of where the video filter is being applied.
that webm was made showing the "true-color" setting:
https://weather.cod.edu/satrad/?parms=regional-ca_reg_east-truecolor-200-0-100-1&checked=map&colorbar=undefinedbut you can change to the "natural" color setting to see it without the night vision correction:
https://weather.cod.edu/satrad/?parms=regional-ca_reg_east-natcolor-200-0-100-1&checked=map&colorbar=undefinedin the attached screenshots, "true-color" is on the top and "natural" color is on the bottom.
