Scientists spot sunspot with centre twice the size of Earth

Posted on:24 Jan 2017 18:13:25
Scientists spot sunspot with centre twice the size of Earth
24 January 2017 Current Affairs: Scientists have spotted a new view of the dark, contorted centre of a sunspot that is nearly twice the diameter of the Earth. It was spotted using Atacama Large Millimetre/submillimetre Array (ALMA) antennas located in Atacama Desert of northern Chile. The discovery is an important expansion of range of observations that can be used to probe the physics of our nearest star.

Using ALMA antennas capabilities, astronomers imaged the millimetre-wavelength light emitted by the Sun’s chromosphere, the region that lies just above the photosphere that forms the visible surface of the Sun. 

They produced the images to study solar activity at longer wavelengths of light that are typically available to solar observatories on Earth. Using two of ALMA’s receiver bands at wavelengths of 1.25 millimetres and three millimetres, scientists were able to observe an enormous sunspot.

 The images captured through it help to reveal differences in temperature between parts of the Sun’s chromosphere and also understanding the heating and dynamics of the chromosphere.

They are darker, cooler areas on the surface of the sun in a region called the photosphere (having temperature 5,800 degrees Kelvin). Sunspots can be very large, up to 50,000 kilometers in diameter and have temperatures of about 3,800 degrees K. They are dark in comparison with the brighter and hotter regions of the photosphere surrounding them.
Scientists have spotted a new view of the dark, contorted centre of a sunspot that is nearly twice the diameter of the Earth. It was spotted using Atacama Large Millimetre/submillimetre Array (ALMA) antennas located in Atacama Desert of northern Chile. The discovery is an important expansion of range of observations that can be used to probe the physics of our nearest star.

Using ALMA antennas capabilities, astronomers imaged the millimetre-wavelength light emitted by the Sun’s chromosphere, the region that lies just above the photosphere that forms the visible surface of the Sun. 

They produced the images to study solar activity at longer wavelengths of light that are typically available to solar observatories on Earth. Using two of ALMA’s receiver bands at wavelengths of 1.25 millimetres and three millimetres, scientists were able to observe an enormous sunspot.

 The images captured through it help to reveal differences in temperature between parts of the Sun’s chromosphere and also understanding the heating and dynamics of the chromosphere.

They are darker, cooler areas on the surface of the sun in a region called the photosphere (having temperature 5,800 degrees Kelvin). Sunspots can be very large, up to 50,000 kilometers in diameter and have temperatures of about 3,800 degrees K. They are dark in comparison with the brighter and hotter regions of the photosphere surrounding them.

Monthly Current Affairs

Current Affairs Section

Daily Current Affairs Quiz

Subscribe to Current Affairs

Enter your email to get daily current affairs

Current Affairs 2018 October

21 OCTOBER
NEWS
20 OCTOBER
NEWS
19 OCTOBER
NEWS
18 OCTOBER
NEWS

Current Affairs 2018 September

30 SEPTEMBER
NEWS
29 SEPTEMBER
NEWS
28 SEPTEMBER
NEWS
27 SEPTEMBER
NEWS

Current Affairs 2018 August

31 AUGUST
NEWS
30 AUGUST
NEWS
29 AUGUST
NEWS
28 AUGUST
NEWS