SMART Instrumental Design The SMART spacecraft contains many different instruments to measure certain things like the electron content of the reconnection area, magnetism aspects of reconnection, ion content, plasma, energetic particles, and any other physical aspects of reconnection. SMART’s payload, or content, is divided into sections:

• Fields- these instruments take up the majority of the spacecraft and deal with position of the spacecraft, magnetic measurements, and electron content.

• Hot Plasma Composition Analyzer- this one large instrument consumes an unusually large portion of the spacecraft and an unusually large amount of power- it collects data on plasma, or super-hot gases, within the reconnection area.

• Energetic Particle Sensors- these three sensors, which include two “Fly's eye” sensors and an ion spectrometer, gather data on special particles called energetic particles and ions. The Fly's eyes measure the energetic particles while the ion spectrometer measures the ions. These sensors take up a significant portion of the craft and consume a significant amount of energy, but they consume less than their hot plasma counterpart.

• Spacecraft Potential Control- two of these collect various measurements of the ambient, or surrounding, plasma in the reconnection area. The density of the plasma and energy flux vectors (direction of motion of the energy) are some of the measures made by the potential controls. The ASPOC (for short) uses more space than the particle sensors and more power.

• Payload Processor- the central instrument data processor is the brain of the spacecraft. It takes information from all the other instruments and makes sense of them to direct the craft. It takes up a small portion of the craft compared to all the other components.