Question 10 Sunspots are temporary phenomena in the Sun's photosphere that appear as darker spots than the surrounding areas (see image). They are regions of reduced surface temperature, caused by magnetic eld concentrations. The spots or groups of spots can last from days to a few months, but eventually dissipate. Their size is also not xed, and they expand and contract as they move across the Sun's surface, with diameters ranging from a few tens to hundreds of thousands of kilometers. Source: NASNSolar Dynamics Observatory. We can measure the area of a sunspot in thousands or millions of lung, but this area is best expressed in 'millionths of the solar hemisphere" (MH), so '1 MH corresponds to the visible area of the Sun {half of its total area) divided by 1,000,000. We can also interpret the MH as a percentage. In this case, '1 MH corresponds to 0.0001% of the total area of the Sun's visible hemisphere. For example, the largest sunspot ever recorded to date occurred in April 1947. It reached about 6,000MH. 6.000 MH= 5,000 x 0.0001 \"it: of the area of the solar hemisphere = 0.5% of the area of the solar hemisphere. Calculate in terms of "Jupiter's Hemispheres" (HJ) the size reached by this sunspot of 1947. Data: Radius of Sun = 6.96 x 103m Jupiter's radius Rjup = 115 x 107m