2 a) A satellite re-entering Earth's atmosphere will suffer a radio communications blackout because of the plasma created by the shock wave in front of it. If the satellite's radio operates at a frequency of 120 MHz, what is the minimum plasma density during the blackout? b) The type of orbit (LEO, MEO, HEO, or GEO) a satellite is in depends on its purpose. What are the advantages and disadvantages of LEO and GEO for communication and Earth observing purposes