Final answer:
Solid magenta lines on a VFR sectional chart outline the boundaries of Class E airspace at either 700 or 1,200 feet AGL, important for pilots navigating controlled airspace.
Step-by-step explanation:
On a VFR sectional chart, solid magenta lines indicate the boundaries of Class E airspace at an altitude of 700 or 1,200 AGL (Above Ground Level), which serves to protect the controlled airspace for IFR (Instrument Flight Rules) and VFR (Visual Flight Rules) operations. These airspace boundaries are critical for pilots to be aware of when planning and conducting flights, as they dictate where a pilot can fly and the communications required for those areas. These magenta lines help ensure that pilots are flying within the appropriate airspace corridors designed for their type of flight.