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Surface is not smooth - Prominences and Flares Solar Flares...

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Surface is not smooth. Has small spikes called Spicules (blades of grass in a prairie fire). Spicules are about 700 km across and 7000 km tall (1 arc sec.). Last from 5 to 15 min. The Corona - Outer most part of the solar atmosphere. Close to the solar limb – temp of 2 million˚ k. Heating of the Corona –Theory says the Corona is formed of loops of gas. Loops transport radiation. <Why is the Corona so hot?> Gas is trapped in the magnetic loop. Ionized gas is accelerated to very high speeds as it follows the magnetic field lines. The temperature of the corona is measured by velocity of the gas particles that make it up. The density of the corona is less than 1 billionth of Earth’s atmosphere. Coronal Holes – dark area in the corona which are cooler than the surrounding area. These area’s are at the north and south poles.
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Unformatted text preview: Prominences and Flares Solar Flares – violent eruption that occur in regions around sunspots. Solar flares last for about 20 minutes. Plages – has the appearance of a beach . Filament – Dark threads that came be as much as 100,000 km in length. Prominence – a region of cool gas embedded in the corona. Prominences are very bright when seen above the limb. From above they look like filaments. Quiescent Prominence – These last for weeks and look like a curtain of gas slowly descending. Coronal Mass Ejections – a blast of gas moving outward through the Sun’s corona and into interplanetary space following the eruption of a prominence. These ejections of ionized gas are strong enough to affect Earth’s weather and communication. Could also be very dangerous to astronauts...
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