Sunday 30 March 2025
A team of scientists has made a significant breakthrough in understanding how the sun’s corona, its outer atmosphere, is able to heat up to incredibly high temperatures despite being much cooler than the surface of the sun. The corona is so hot that it’s about two million degrees Fahrenheit (1.1 million degrees Celsius), which is even hotter than the surface of the sun.
To investigate this phenomenon, researchers used a combination of observations from the Goode Solar Telescope and the Hinode spacecraft. They focused on an active region of the sun’s surface, where sunspots and other features are abundant. By analyzing data from both telescopes, they were able to detect tiny waves in the chromosphere, the layer just above the sun’s surface, that propagate downwards.
These waves, known as Alfvén waves, are a type of magnetic wave that can transfer energy through the chromosphere. The researchers found that these waves are closely linked to the abundance of certain elements in the corona, such as silicon and sulfur, which is a key indicator of how hot the plasma is. They discovered that areas where these waves were detected had higher abundances of these elements, indicating a higher level of heating.
The team also used data from the Solar Dynamics Observatory’s Helioseismic and Magnetic Imager to extrapolate the magnetic field lines in the chromosphere. By tracing these lines back up to the corona, they found that the areas where the Alfvén waves were detected were connected to regions with higher FIP bias, a measure of how much hotter the plasma is.
This study provides strong evidence for the role of Alfvén waves in heating the sun’s corona. The researchers believe that these waves are responsible for transferring energy from the chromosphere to the corona, where it heats up the plasma to incredibly high temperatures. This finding has significant implications for our understanding of the sun’s internal dynamics and how it affects the solar system.
The study also highlights the importance of simultaneous observations from multiple spacecraft and telescopes in understanding complex phenomena like this one. By combining data from different instruments, researchers can gain a more complete picture of what’s happening on the sun and how its magnetic field is shaping our understanding of the universe.
In the future, scientists plan to continue studying Alfvén waves and their role in heating the corona. They hope to use observations from new spacecraft and telescopes to further refine their understanding of this phenomenon and its implications for our understanding of the sun’s internal dynamics.
Cite this article: “Unlocking the Mystery of the Suns Scorching Corona”, The Science Archive, 2025.
Sun, Corona, Alfvén Waves, Magnetic Field, Chromosphere, Plasma, Heating, Temperature, Solar Dynamics, Spacecraft.
