Flares are caused by magnetic disturbances in the lower atmo- sphere of the Sun. (T/F)
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- The velocity of the solar wind is roughly 400 km/s. How long does it take to travel from the sun to Earth?Assume that the solar wind causes the Sun to lose mass at a rate of 2 x 10’ kg/s. If you assume the wind is emitted a constant rate, estimate the time (in units of Gyr =Gigayears = 10° years) that it will take the entire Sun to evaporate via its solar wind emission. (Of course, the rate won't be constant throughout the lifetime of the Sun---this is just a rough estimate to understand the timescale associated with this process.) [Hint: you need to look up a number and do several unit conversions; this is a *rate* problem. Enter your answer as an integer or decimal, NOT in scientific notation.]Sunspots appear dark because they are hotter than the sur- rounding gas of the photosphere. (T/F)
- The density and temperature in the solar corona are much higher than in the photosphere. (T/F)If a contracting prostar is 3 times the radius of the sun and has a temperature of 1680 k how lumminous will it be relative to the sun? Use luminosity radius temperature to the relation. The surface temperature of the sun is 5800k