Scientists Discover Faster Rotation In The Sun’s Upper Atmosphere

Key Highlights:

• Scientists have discovered that the Sun's upper atmosphere rotates faster than its visible surface.
• The rotation speed of the Sun's atmosphere increases with height above its surface.
• This finding challenges the classical physics principle of conservation of angular momentum.
• The study also observed a slight decrease in rotation speed when solar activity, indicated by sunspots, becomes stronger.
• Research was conducted by scientists from ARIES, Udaipur Solar Observatory, Physical Research Laboratory, and Ahmednagar College.
• Observations were made using the Nobeyama Radioheliograph in Japan.

Detailed Insights:

• The discovery provides a deeper understanding of the Sun's atmospheric dynamics, which are more complex than previously thought.
• Improved models of solar activity and space weather can lead to better predictions of their effects on Earth's satellites, communication, and power systems.
• Unlike Earth's atmosphere, the Sun's gaseous composition allows for differential rotation, where different parts rotate at varying speeds.
• The 2D image-correlation method was employed to measure the rotational velocity by analyzing shifts in solar images over time.
• This research, published in Astronomy & Astrophysics Letters, contributes significantly to fundamental solar physics.

Scientific/Technical Concepts Involved:

• Conservation of Angular Momentum: A fundamental physics principle stating that an object's angular momentum remains constant unless acted upon by an external torque.
• Solar Activity: Refers to changes on the Sun, including sunspots, solar flares, and coronal mass ejections, which can affect space weather.
• Sunspots: Darker, cooler regions on the Sun's surface caused by intense magnetic activity, indicating periods of increased solar activity.
• Nobeyama Radioheliograph: A radio telescope in Japan used to observe the Sun at radio wavelengths, providing insights into its atmosphere.