Aurora Australis - The Halloween Aurora 2021 (Bruce Rohrlach)

Contains: Northern lights

Aurora Australis - The Halloween Aurora 2021

Aurora Australia (31-10-2021) - the Southern Lights - from the same location as the previous post, only this time with a 24mm lens giving a wider field of view over Pyramid Rock (Philip Island).

It was fortuitous that the Milky Way (in the background) was near sub-horizontal behind the pulsing aurora.

The solar wind speed at this point was just over 450 km per second.

For scale ..... the green aurora typically occur at 120-180km above the earths surface. i.e. The base of the green aurora here is around 10 times greater height than the typical maximum height that commercial airliners fly at. The curvature of the earth between my location on the Victorian coastline and 500km south of Tasmania causes the base of the green Aurora to look closer to the ocean than 120 km, as the earth drops away beyond the visual horizon.

The red-pink aurora can extend up to 640 km above the earth, and past the orbital distance of the International Space Station, which often flies through the aurora.

There was another spectacular display 4 nights later.

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	Distinct awarded users	Total awarded images
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Distribution of subject types

This table shows the distribution of awards per subject type, compared to the popularity of images of that subject type.
	Image of the day	Top pick	Top pick nominations	Total submitted
Deep sky
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Northern lights
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	Image of the day	Top pick	Top pick nominations	Total submitted
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Professional, scientific grade data
Mix of multiple sources
Other
Unknown

The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

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Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
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Early dismissal Staff members have a lot of images to inspect on a daily basis, and they can dismiss images if they believe they don't meet the requirements for IOTD/TP selection. If an image is dismissed 5 times, it's removed from the process. This streamlines the process and ensures that any bias present in promotions could be overruled by other staff members.

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Aurora Australis - The Halloween Aurora 2021

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