Starship Asterisk*

From the "[url=https://www.sciencerendezvous.ca/activities/2020/12/30/hear-ice-sing/]was singing[/url]" link, although there's no skater in this scene to cause the 'singing' ice, nevertheless:

[quote][i]"If you have a frozen lake nearby, you don’t need to skate across it to hear these amazing noises. Frozen lakes will make these noises all by themselves with the right conditions, as the ice expands and contracts, sending out vibrations across the lake. Skipping rocks far across the lake can also make the same sounds."[/i][/quote]

"The ice was singing ..."

There is also the intriguing possibility that the Aurora Borealis creates audible noise at ground level:
https://theconversation.com/do-the-northern-lights-make-sounds-that-you-can-hear-168032 .

"... a Finnish study in 2016 claimed to have finally confirmed that the northern lights really do produce sound audible to the human ear."

However, I have not found a link to the Aurora Australis producing audible sound at ground level.

[quote=Ann post_id=320570 time=1644648631 user_id=129702]
[float=left][img3="Aurora by Moonlight. Image Credit & Copyright: P-M Hedén (Clear Skies, TWAN)"]https://apod.nasa.gov/apod/image/2202/auroralakeFeb10_Heden.jpg[/img3][/float]
[clear][/clear]


My first thought when I saw today's APOD was, "An aurora image. Then I'm not expected to say anything smart about it."

My second thought was, "That sure looks like Sweden. That lake, and those low wooded hills in the background, and lights from houses lined up along parts of the shore. What are those branches that we see in the foreground - are they willow, or just birch?"

My third thought was, "It [b][i]is[/i][/b] Sweden. Yeah."

My fourth thought was: "I can see the Big Dipper peeking through between those foreground branches, at right, but not all the way into the corner."

My fifth thought was, "I'll leave the discussion about the aurora to someone else!" :D :wink:

Ann
[/quote]

[attachment=0]auroralakeFeb10_Heden.jpg[/attachment]
Ann; It makes a nice wallpaper! 8-)

If you crank up the saturation the violet and red really pop out. Beautiful image either way.
You live in a beautiful country Ann!

Eric

[float=left][img3="Aurora by Moonlight. Image Credit & Copyright: P-M Hedén (Clear Skies, TWAN)"]https://apod.nasa.gov/apod/image/2202/auroralakeFeb10_Heden.jpg[/img3][/float]
[clear][/clear]


My first thought when I saw today's APOD was, "An aurora image. Then I'm not expected to say anything smart about it."

My second thought was, "That sure looks like Sweden. That lake, and those low wooded hills in the background, and lights from houses lined up along parts of the shore. What are those branches that we see in the foreground - are they willow, or just birch?"

My third thought was, "It [b][i]is[/i][/b] Sweden. Yeah."

My fourth thought was: "I can see the Big Dipper peeking through between those foreground branches, at right, but not all the way into the corner."

My fifth thought was, "I'll leave the discussion about the aurora to someone else!" :D :wink:

Ann

[url=https://apod.nasa.gov/apod/ap220212.html] [img]https://apod.nasa.gov/apod/calendar/S_220212.jpg[/img] [size=150]Aurora by Moonlight[/size][/url]

[b] Explanation: [/b] The ice [url=https://www.sciencerendezvous.ca/activities/2020/12/30/hear-ice-sing/]was singing[/url] as light from a bright gibbous Moon cast shadows across this [url=https://climate.nasa.gov/interactives/global-ice-viewer#/]frozen lake[/url], about 20 kilometers north of Stockholm, Sweden, planet Earth. In the alluring night skyscape captured on [url=https://spaceweather.com/archive.php?view=1&day=10&month=02&year=2022]February 10[/url], shimmering auroral curtains of light dance in the evening sky. On that northern night nature's performance included the auroral displays fostered by a minor geomagnetic storm. [url=https://www.nasa.gov/feature/goddard/2021/five-questions-about-space-weather-and-its-effects-on-earth-answered]Stormy space weather[/url] was the result of a coronal mass ejection, erupting from a solar prominence days earlier and brushing our fair planet's magnetosphere.


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