Slide 1Slide 2Slide 3Slide 4Slide 5Slide 6Slide 7Slide 8Slide 9Slide 10Slide 11Slide 12Slide 13Slide 14Slide 15Slide 16Slide 17The SunCoreThe outward flow of electrons exerts a radiation pressure which balances the force of gravity and stops the collapseThe SunCoreThe sun’s radius remains stable as long as the nuclear reactions continue in the coreThe SunCoreThe region dominated by the outflow of photons from the core is called the radiation zoneThe SunCoreThe condition where the outward pressure counteracts the inward pull of gravity is called the hydrostatic equilibriumThe SunCoreThe region dominated by the outflow of photons from the core is called the radiation zone.In the radiation zone, the primary more of energy transport is through radiation, that is, though the movement of photons.The SunCoreAt a radius equal to the outer radius of the radiation zone, all photons have been absorbed by the gas in the sun. The absorbed photon energy heats the gas at the outer edge of the radiation zone.Radiation ZoneSunConvectionConvection – the transfer of heat from one location to another by the flow of material.SunConvectionConvection – the transfer of heat from one location to another by the flow of material.Hot materialCool materialSunConvectionConvection – the transfer of heat from one location to another by the flow of material.Hot material risesCool materialSunConvectionConvection – the transfer of heat from one location to another by the flow of material.Hot material risesCool material sinksSunConvectionConvection current – the flow of material resulting from convection.Hot material risesCool material sinksSunConvectionConvection cell – a region of connected flows of a convection current.Hot material risesCool material sinksThe SunCoreRegion dominated by convection currents is called the Convection Zone.Radiation ZoneConvection ZoneThe remaining regions outside of the Convection zones are called the Photosphere, Chromosphere, and Transition zoneThe SunCoreRadiation ZoneConvection ZoneThe remaining regions outside of the Convection zones are called the Photosphere, Chromosphere, and Transition zoneThe SunOutside of the visible portion of the sun is the corona, which cannot be seen because of the brightness of the sun. The corona can be observed during an eclipseSunHelioseismologyHelioseismology is the study of surface patterns and pressure waves in the sun.Global Oscillations Network Group (GONG)Solar and Heliospheric Observatory (SOHO) – Extreme Ultraviolet Imaging Telescope (EIT)Show very complex interior motions within the sunSOHOSunHelioseismologyHigh resolution images show the surface of the sun to be a highly turbulent and mottled regions of bright and dark gas called granules. Each granule can be 1000 km across – the size of a typical continent on the earth.Supergranules can be substantially bigger, on the order of 30,000 km across.Granules and
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