The NSF Inouye Solar Telescope observed the first X-Class solar flare and the smallest coronal loop ever imaged.
These high-resolution images of solar flares may help researchers to better understand the solar magnetic structure and improve weather forecasts in the space.
Using the Daniel K. Inouye solar telescope of the National Science Foundation (NSF), built and operated by the NSF National Solar Observatory (NSO), astronomers captured a dark coronal loop chain with unprecedented clarity during the collapse period of the X1.3 class flare.
This marks a potential breakthrough that resolves the fundamental scale of the solar coronal loop and pushes the limits of flare modeling into a whole new realm.
What is a coronal loop? Also, why is it important for studying the sun?
Coronal loops are plasma arches following the solar field lines and often precede solar flares that cause sudden release of energy associated with some of these field lines.
This burst of energy burns solar storms that can affect the Earth’s critical infrastructure. Inouye astronomers observe sunlight at the H-Alpha wavelength (656.28 nm) to display specific features of the sun, revealing details that are invisible by other types of solar observations.
“This is the first time that the Inouye Solar Telescope has observed X-class flares,” said Cole Tamburri, lead author of the study, supported by the Inouye Solar Telescope Ambassador program.
“These flares are one of the most energetic events our stars produce, and we were fortunate to be able to catch this under perfect observation conditions.”
How Inou Solar Telescopes have produced the clearest image ever
Researchers focused on the razor’s thin magnetic field loops (hundreds of them) and were woven onto the flared ribbons. On average, the loop was about 48 km wide, but some were correct due to the telescope’s resolution limits.
“Before Inoue, I could only imagine what this scale would look like,” commented Tamburi. “Now we can see it in person. These are the smallest coronal loops ever imagined on the sun.”
Adjusted to the H-Alpha filter, Inouye’s Visible Broadband Imager (VBI) equipment can solve features up to approximately 24 km. This is more than twice as sharp as the next best solar telescope, and it is a leap in resolution that allowed the discovery of this solar flare.
The original research plan involved studying the dynamics of chromosomal spectral lines using Inouye’s Visible Spectrometer (VISP) instrument, but VBI data revealed unexpected, ultrafine coronal structures that could directly inform flare models constructed with complex radioactive hydrodynamic codes.
The theory has long suggested that coronal loops can be anywhere from 10 to 100 km wide, but it has previously been impossible to confirm this range observable.
Tamburi explained: “We are finally peering into the spatial scale we’ve been guessing for years, which opens the door to studying not only size, but shape, evolution, and even scales where magnetic reconnection occurs.”
A groundbreaking moment in solar flare science
Perhaps the biggest finding from this study is the idea that these loops may be fundamental structures that are fundamental components of solar flare architectures.
The image itself is breathtaking. A glowing arcade with dark thread-like loops, bright flared ribbons etched with almost incredibly sharp reliefs – compact triangles near the center, arc-shaped ones spreading over the top.
He suggested that even casual viewers Tamburri suggested would soon recognize the complexity.
He concluded: “It’s a groundbreaking moment in solar flare science. Finally, we’re looking at the sun on the scale it works.”
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