SDO/AIA 193Å 2014-10-24 23:41:30 UTC The Atmospheric Imaging Assembly (AIA) on the Solar Dynamics Observatory (SDO) is designed to provide an unprecedented view of the solar corona, taking images that span at least 1.3 solar diameters in multiple wavelengths nearly simultaneously. This is an image of the Sun observed by Solar Dynamics Observatory in the extreme ultraviolet region (193 Å) on 2014-10-24 23:41:30 UTC. The AIA 193 channel takes images of the Sun at 193 angstroms (extreme ultraviolet) which highlights the outer atmosphere of the Sun – called the corona – as well as hot flare plasma. Hot active regions, solar flares, and coronal mass ejections will appear bright here. The dark areas ‒ called coronal holes ‒ are large regions in the corona that are less dense and cooler than surrounding areas. Coronal holes are where the Suns magnetic field does not loop back down to the surface; it is open into interplanetary space. They are places where very little radiation is emitted, yet are the main source of solar wind particles. The open structure of their magnetic field allows a constant flow of high-density plasma to stream out of the holes. As shown in this image, a recurrent trans equatorial coronal hole (CH640) was in an Earth facing position on October 19−22. The geomagnetic field is expected to be quiet to unsettled on October 25 due to lingering effects from CH640 and quiet on October 26−27.
Posted on: Sat, 25 Oct 2014 15:38:56 +0000
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