New images of sun reveal its strange, dynamic facade, Pg18

Key Highlights:

• The National Science Foundation's Daniel K. Inouye Solar Telescope has captured the highest-resolution images of the sun's surface to date.
• These images reveal dynamic, feathery patterns and turbulent "boiling" plasma on the sun's outer shell.
• The telescope, located on Maui, Hawaii, provided unprecedented detail, initially used for fine-tuning and testing.
• The observed patterns are ripples of instability caused by magnetized plasma moving at different speeds, a phenomenon known as Kelvin-Helmholtz instability (KHI).

Sun.jpg

Detailed Insights:

• The Daniel K. Inouye Solar Telescope is the world's largest solar telescope, featuring a 4-meter aperture.
• It is funded by the National Science Foundation and managed by the National Solar Observatory.
• Its strategic location on the summit of Haleakalā, Maui, Hawai'i, was chosen for optimal atmospheric conditions.
• The images showcase cell-like structures, each approximately the size of Texas, indicating heat transport through convection.
• These high-resolution observations are vital for understanding space weather, which can disrupt Earth's technology.
• The telescope's primary goal is to study the Sun's magnetic fields, which are the source of solar flares and coronal mass ejections.
• The first images from the telescope were released in January 2020, resolving features as small as 30 km.

Scientific/Technical Concepts Involved:

• Photosphere: The visible surface layer of the Sun, composed of plasma, from which most of its light is emitted.
• Plasma: A super-heated, ionized gas of electrons and ions, constituting the majority of the Sun's matter.
• Convection: The process of heat transfer in fluids where hot plasma rises, cools, and then sinks, creating turbulent surface patterns.
• Kelvin-Helmholtz instability (KHI): A fluid dynamics phenomenon characterized by ripples formed at the interface of two fluids moving at different velocities.