July 16th, 2024

Electric Clouds This Summer

Noctilucent clouds, or "night-shining" clouds, are increasingly visible in the Northern Hemisphere due to climate change and rocket activity. These high-altitude clouds at 50 miles above Earth are studied for climate change indicators.

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Electric Clouds This Summer

Noctilucent clouds, also known as "night-shining" clouds, are becoming more visible in the Northern Hemisphere due to factors like global climate change and rocket activity. These high-altitude clouds, located about 50 miles above the Earth's surface, are sensitive to changes in temperature and water vapor in the upper atmosphere. Long-term studies suggest an increase in their brightness and frequency, potentially indicating climate change. Noctilucent clouds can be observed with binoculars and photographed, with citizen scientist projects helping track them. They are most visible from May to September, with a peak around July 11. Recent underwater volcanic activity and rocket launches may contribute to their brightness this year. These clouds, with their electric appearance and cool palette, offer a unique spectacle in the twilight sky, making this summer an ideal time for skywatchers to observe them.

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By @fwlr - 7 months
The article mentions both rockets and volcanoes as causes of the increase, but carefully elides any mention of the exact numbers each contributes. I couldn’t easily find any concrete numbers on how much water vapor is involved in a typical rocket launch, but the 2022 Tonga underwater volcano eruption contributed an estimated 150 million tons of water vapor to the atmosphere, which is well beyond the scale of rocket launch contributions. So it’s almost all volcanic and only trivially aeronautic.
By @temp0826 - 7 months
NASA had a mission called AIM (Aeronomy of Ice in the Mesosphere) that observed noctilucent clouds, but it looks like the satellite stopped sending data in March of last year?

https://aim.hamptonu.edu/

By @UmYeahNo - 7 months
I have more questions than answers after reading this.

"They’re lit by a twilight sun catching on ice crystals and seeded by rocket exhaust and space dust." and

"Exhaust from rockets, which have been launching in growing numbers lately, can also seed the clouds, as the AIM satellite research showed."

...are a pretty startling notion.

Should we expect, then, that this phenomena will be constant / worsening moving forward as the proliferation of rocket launches increases thereby pumping more water / alumina / particulates into the very upper atmosphere?

I'm not an alarmist normally, but taken further, then is it too hyperbolic to say that SpaceX and its high-frequency launch competitors are already changing the global weather within just a few years of ramping up operations?

Can we say with certainty that the occurrence of these clouds is not an harbinger / indicator of future weather changes? Like, does having more ultra-high altitude clouds increase or decrease greenhouse effects, for example?

By @chrisweekly - 7 months
Ooh, gorgeous photos and a reasonably scientific description of the phenomenon. Recommended!
By @imp0cat - 7 months
Yeah, there seems to be a lot of noctilucent clouds this year.