Our Sun is one of the most fascinating objects in the universe and photographing it with specialized equipment to capture its splendor and beauty has become increasingly more common around the world. This is most evident with the work obtained by renowned astrophotographer, Andrew McCarthy (@AJamesMcCarthy), who owns Cosmic Background Studios in Florence, Arizona.
On July 27, 2024, McCarthy posted an image of the Sun on X (formerly known as Twitter) taken with his specialized equipment designed to safely photograph our life-giving star, which revealed active coronal loops and plasma within the solar chromosphere that are some of the many intriguing features of the Sun. However, McCarthy is quick to mention in his post that this image isn’t entirely genuine, but a combination of several attributes.
“This image is a piece of digital art that combines real astrophotos with some rendered features,” McCarthy tells Universe Today. “I captured the solar chromosphere with a solar-modified telescope, designed to block out the photosphere’s light to reveal the faint structure in the Sun’s atmosphere. The corona was captured during April’s total solar eclipse. Between the large-scale and small-scale structures of the photos, there’s a lot going on invisibly with the Sun’s magnetic field. Using some real data of that field as reference, I rendered coronal loops in a plausible way to show a more complete image of the scales of magnetic structure on the Sun.”
The solar chromosphere is the second layer of the Sun’s atmosphere residing above the Sun’s surface, known as the photosphere (4,130 to 6,330 °C), and below the corona (just under 1,000,000 °C). The chromosphere is known for its red color that is observed hydrogen-alpha electromagnetic emissions and extends between 3,000 to 5,000 kilometers (1,900 to 3,100 miles) in height, which is approximately one percent of the Sun’s radius, while exhibiting temperatures ranging between 3,500 to 35,000 °C. It is the solar chromosphere that is responsible for producing coronal loops, which are arch-like structures produced by the Sun’s magnetic field activity, typically occurring from sunspots. In addition to the incredible image, McCarthy also posted an equally incredible 14-second video of these incredible features in action.
McCarthy tells Universe Today, “These are an example of the magnetic loops captured authentically by isolating the plasma caught in them. This produces coronal rain, plasma raining back onto the photosphere.”
Our Sun is essentially a giant ball of plasma that is undergoing constant change, both within its interior and on its surface, including radio waves, solar wind, and magnetic field. Studying the magnetic field teaches scientists about 22-year cycles where the poles of the magnetic field flip and then return to their initial position, resulting in increased solar activity occurring over 11-year cycles during each transition. This increased magnetic field activity results in increased solar wind emanating from the Sun, leading to solar storms that can strike Earth, causing auroras near our planet’s poles while also harming satellites in orbit and electronic ground stations. One of the most revered incidents of solar storms on Earth was the Carrington Event, which occurred between September 1-2, 1859, resulting in worldwide auroras and telegraph station fires across the globe, as well.
Scientists who study the Sun and its various features are known as solar physicists who use a combination of ground- and space-based telescopes to obtain data regarding the Sun’s activity on a 24/7 basis. Arguably one of the most successful missions to study the Sun is NASA’s Parker Solar Probe, which was launched on August 12, 2018, and has traveled closer to the Sun than any human-made spacecraft in history, coming within 7.26 million kilometers (4.51 million miles) from the Sun’s surface in September 2023 and again in March 2024. During its mission, the Parker Solar Probe encountered magnetic field switchbacks, which is when the magnetic field reverses its direction, resulting in heating the solar corona.
Examples of ground-based telescopes that study the Sun include the Mauna Loa Solar Observatory, which like McCarthy, uses specialized equipment to safely study the Sun and its various features, providing data and images that can be used for research and public outreach. Therefore, how can McCarthy’s work be used for scientific research, and has his past work been used for scientific research purposes?
“This image is in no way intended for scientific research, but rather a product of scientific research,” McCarthy tells Universe Today. “That said, hydrogen alpha images of the sun offer real insight into the behavior of the sun’s magnetic field and are used by scientists worldwide. Amateurs capturing the sun in detail can complement the data produced by professional observatories on earth and in space and play a role in public outreach that can sometimes be lacking by professional institutions.”
McCarthy has become well-known for capturing incredible images of the Sun and sharing them with the public, including breathtaking images and videos of tornado-like prominences emanating from the solar chromosphere in March 2023, which also captured images of the solar corona. Along with these images, McCarthy provides detailed descriptions of the events occurring in his work with the goal of exciting the public about the Sun and its many incredible features.
“The Sun is unique in that every time I photograph it, it looks completely different,” McCarthy tells Universe Today. “The features are always changing. For that reason, it’s a target I will keep coming back to. While intended purely as a piece of digital art, my goal with this piece was to inspire people to ponder our fragile existence kept in balance by our host star. Hopefully it inspires more people to study it, as it gives us a better understanding of this universe we live in!”
What new discoveries will we make about our Sun in the coming years and decades? Only time will tell, and this is why we science!
As always, keep doing science & keep looking up!
Links:
Andrew McCarthy: X (Twitter) & Website