Next: Solar Observations
Most of the universe is in the plasma state, the fourth state of
In such situations the plasma may be described by the equations of MHD.
- In a plasma the temperature, , is so high that the gas
and the atoms split into positive ions and negative electrons.
- The plasma is treated as a continuous medium, a conducting
gas through which eletric currents can flow and in which there exists a
magnetic field, . The assumption of a continuous medium
does require the typical lengthscales of the plasma to be
sufficiently large. For example, the lengthscales must be larger than
the typical distance an ion travels before a collision (the
- All the phemonena observed on the Sun are created by the
magnetic field and its interaction with the plasma.
Prof. Alan Hood