![]() These examples are programmatically compiled from various online sources to illustrate current usage of the word 'corona.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. 2023 Images taken of the corona reveal a more detailed look at its structure and at how matter leaves the sun and makes up solar wind. Anne Fadiman, Harper’s Magazine , 1 Mar. 2023 My husband stood at the end of our road beneath the moon’s eclipse of the sun, just a halo of the corona visible above his head, and our three-month-old son asleep in his arms. 2023 That was during corona time, so that was stop and start, but exactly three years. 2023 More remote satellites are better at seeing deeper into the sun, closer to the bottom of the corona. 2023 As the Moon's dark silhouette completely obscures the bright light of the sun, a faint solar corona is all that remains visible of the burning star, allowing a unique (if not relatively short-lived) chance to study it. 2023 Here the cigar makers toiled, rolling coronas, royals, perfectos, and panatelas by hand. 2023 Weather permitting, people along the path of totality will see the sun’s corona, or outer atmosphere, which is usually obscured by the bright face of the sun. These speeds are so high that the particles can escape the Sun's gravity.Ĭonceptual animation (not to scale) showing the Sun's corona and solar wind.Recent Examples on the Web During totality, the sun’s wispy outer atmosphere, known as the corona, becomes visible, while the landscape down below turns nearly as dark as night. ![]() The corona's temperature causes its particles to move at very high speeds. From it comes the solar wind that travels through our solar system. We can view these features in detail with special telescopes. These include streamers, loops, and plumes. The Sun's magnetic fields affect charged particles in the corona to form beautiful features. This is the force that makes magnets stick to metal, like the door of your refrigerator. The surface of the Sun is covered in magnetic fields. But astronomers think that this is only one of many ways in which the corona is heated. In the corona, the heat bombs explode and release their energy as heat. The mission discovered packets of very hot material called "heat bombs" that travel from the Sun into the corona. Yet the corona is hundreds of times hotter than the Sun’s surface.Ī NASA mission called IRIS may have provided one possible answer. The corona is in the outer layer of the Sun’s atmosphere-far from its surface. This is the opposite of what seems to happen on the Sun.Īstronomers have been trying to solve this mystery for a long time. But when you walk away from the fire, you feel cooler. Imagine that you’re sitting next to a campfire. The corona’s high temperatures are a bit of a mystery. The corona is 10 12 times as dense as the photosphere, and so produces about one-millionth as much visible light. Image of corona from NASA's Solar Dynamics Observatory showing features created by magnetic fields. The Sun's corona is much hotter (by a factor from 150 to 450) than the visible surface of the Sun: the photosphere 's average temperature is around 5 800 kelvin compared to the corona's 1 to 3 million kelvin. This low density makes the corona much less bright than the surface of the Sun. Why? The corona is about 10 million times less dense than the Sun’s surface. The corona reaches extremely high temperatures. Find tips on how to safely view an eclipse here. Remember to never look directly at the Sun, even during an eclipse.
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