NASA’s Solar Dynamic Observatory photographed coronal holes (two dark spots) March 16th. Near the south pole is the larger of these two holes. It covers 6% to 88% of Sun’s surface. According to SDO scientists, the coronal hole larger than any other has been detected for decades. It is shorter and more narrow than the smaller, darker patch near the north pole. This area covers about 0. It covers approximately 0. Two coronal holes were visible in this March 2015, image. This was the largest coronal hole that had been observed for decades. Image Credit: NASA/SDO. What is a coronal hole? Coronal holes refer to regions in the Sun’s outer atmosphere, corona. They have lower temperatures and density. Fast solar winds can be generated by coronal holes, which are composed of small amounts of solar particles. These solar particles help to develop the Earth. The magnetic field of coronal holes regions does not loop back quickly into the Sun’s surface. Instead, it extends far into space. The arcs seen in the non-coronal holes regions are magnetic fields that loop back up to the Sun’s top. The brightly active area is located in the lower left quadrant. This region was where last week’s solar flares were seen. A coronal hole lies near the Earth’s centre. Solar particles travel to Earth through the coronal hole, causing geomagnetic disturbances and increasing the frequency of auroral activity at high latitudes. Yesterday evening, intense auroral activity was observed in the northern regions of North America, Europe and Australasia.
NASA detects two coronal holes in the Sun’s surface
