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NSF Inouye Solar Telescope Enables Major Discovery of a Hidden Solar Process

90 points1 daynso.edu
rootusrootus1 day ago
mturmon22 hours ago

This kind of observation is a big deal for solar physics.

It's been believed for decades that these small-scale (~100km and below) turbulent features are critical to understanding how energy dissipates in the Sun. And thus, how sunspots and flares form.

The subject has been very qualitative but is yielding on both observational and simulation fronts. I worked adjacent to this area from the 1990s-2010s, and it had been true that MHD numerical simulations of significant volumes of the Sun (but at a scale fine enough to resolve these features) were not possible. That has obviously changed!

Additionally, it had been that the best solar observatories could not quite resolve these features. In the late 1990s some of the best images came from a couple of observatories in the Canary Islands (e.g., the 1-meter Swedish telescope -- https://svs.gsfc.nasa.gov/4715/). The spatial resolution was perhaps in the ~100km range.

Of course, these are absolutely mind-boggling images. You're looking at a slice of the solar photosphere that has a temperature such that it activates a spectral line around 400nm. By isolating that wavelength, we can see what's happening at that temperature, and thus, sample a slice of the photosphere.

So, that had been the state of affairs. Now DKIST (4m aperture), with the particular instrument highlighted in OP, appears to be at a spatial resolution ~5x finer than the above imagery -- see Fig. 1c in the Nature paper (https://www.nature.com/articles/s41586-026-10871-3). It appears also (https://dkist.virtualsolar.org/vanNoortfastcam/) to be observing at 740Hz (!) for speckle reconstructions at ~1Hz.

At this scale, vortices of the flow are well-resolved -- where before you just resolved the convective cells but not the turbulent features around them. It's these turbulent features that are transporting energy.

To contextualize with respect to a HN perennial topic: DKIST (commissioned 2021) is funded by NSF, from the same pile of money that once funded Arecibo (up to 2020).

robertlucas11 hours ago

Thanks a lot for sharing your experience with us.

I worked adjacent to this area from the 1990s-2010s when the topic is solar physics is definitely why this forum is one of the last "places" of the internet.

mturmon5 hours ago

Sure thing.

Remote sensing of the Sun is different from anything else, because you have so many photons. The idea of binning it down so fine (20x20km, 740Hz, a single nm of spectrum around a band center) is unheard of for any other target.

bluenose6950 minutes ago

The Nature paper is open-access at https://www.nature.com/articles/s41586-026-10871-3 in case folks want to read the details.

x______________8 hours ago

Not to undermine how cool this is but is there any reason why we are only getting a looped 3 second video?

jdnier13 minutes ago

Check out the last video on the page. It zooms in and you get a sense of just how much resolution there is.

cf100clunk1 day ago

Don't look directly at them.

doodlebugging2 hours ago

Just get yourself a pair of these DuckDuckGo Paso Robles and enjoy the view.

https://knockaround.com/products/duckduckgo-paso-robles

eviks14 hours ago

You can use a protective glass built into your monitor!