Seems to be different from http://lacunapassage.userecho.com/topics/288-058b-dust-storm-effect-randomly-turns-onoff/ as in my case it definitely doesn't turn completely off (not even close). The storm density does change (that's what causes the flicker), but never does it seem unnaturally clear.
Anyhow, the brightness/density of the sandstorm changes with time, like I imagine it would IRL. However, this happens very fast and looks more like a failed lightning effect than a brightness change. I think it would look very natural if scaled to real time, but in game time (1 RL second per game minute or so?) it looks way too fast if compared to YouTube videos of sandstorms on Earth.
By the way, I really like the sandstorms! Just tried the sandstorm start and I actually felt relief when on sol 4 the storm finally cleared after 2.5 days, with power and oxygen running dangerously low!
Customer support service by UserEcho