3/26/2023 0 Comments Sun corona protrusionsThere’s a third possibility when viewing these loops in the optically thin corona. Are they thick, kind of like a garden hose? Or are they thin, like a ribbon viewed on its edge? The optical thinness also makes it difficult to discern how thick the loops are. And it’s difficult to tell which might be in the foreground and which are in the background. That optical thinness means that structures like coronal loops can overlap one another when we observe the Sun. While that might sound like an observational advantage, that’s not necessarily the case. MURaM allows scientists to create observations of the Sun, including the corona, that are “artificial.” The Sun’s corona is optically thin, which means that it’s easy to see through. These data sets contain the magnetic field’s structure and the plasma that conforms to it. MURaM allowed scientists to observe the complete life cycle of a solar flare, starting from deep within the Sun, to the flare’s emergence on the surface, to its explosive release into space.īut the main result as far as this study is concerned is the data set created by MURaM. MURaM is significant because scientists hadn’t been able to model such a wide range of conditions before its development. The physical conditions in that wide range vary widely in pressure and density. MURaM is a realistic simulation that extends from deep inside the Sun-about 10,000 km below the surface-up to almost 40,000 km into the corona. This research is based on a ground-breaking simulation developed largely at NCAR/UCAR. We demonstrate how apparently isolated loops could deceive observers, even when observations from multiple viewing angles are available,” the authors write. “We demonstrate the difficulty of discerning from observations whether a particular loop corresponds to a strand in the volume or a projection artifact. But it’s not easy to discern between the actual coronal loops and artifacts. Some of the loops are what they’re calling projection artifacts. “This study reminds us as scientists that we must always question our assumptions and that sometimes our intuition can work against us,” Malanushenko said. Coronal loops, observed in the ultraviolet radiation Fe IX 17.1 nm (171 Å) by the TRACE spacecraft on 6 November 1999, extending 120 000 km off the Sun’s surface. According to the research, some of them are illusions that they’re calling the “coronal veil.” And their existence is making the authors question what they thought they knew about the Sun.
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