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Some countries are still illegally using banned chlorofluorocarbons (CFCs). "In 2018, high levels of banned chlorofluorocarbons were detected in the atmosphere that were eventually traced to China" Other reasons include climate change. The concentrations of the damaging substances in the atmosphere have leveled off since the protocol came into ...


21

Why is there still a hole in the ozone layer? To some extent, there most likely will always be an area over Antarctica with reduced stratospheric ozone content in late Southern Hemisphere winter. (I wrote "always". Read that as meaning for the next several millions of years.) The issues is how long that annual ozone hole exists, how large that ...


7

How can the air in the Earth's shadow scatter blue light if it doesn't get any direct illumination, and any indirect illumination getting back there should be VERY depleted in blue (i.e. mostly red light)? You're completely right. If you simulate light scattering only, you'll get exactly this result: a sandy-colored sky, with a bit redder belt of Venus, and ...


5

According to this Wikipedia entry Sprites occur at altitudes between 50 and 90km while the thunderstorms that create them generally top out below 16km so there is a minimum of more than 30km of height difference between a storm and any sprites it may spawn. So yes, at the right angle, you should be able to get a photograph of a storm's sprites from the ...


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