  Current theory states that the magnetic moment of a charged particle is
constant, or invariant in a slowly changing magnetic field. It also states that
the magnetic flux through a Larmor orbit is constant. The current theory is
closely examined, and found to have inconsistencies. An alternative theory is
developed with new results for both the energy and magnetic moment of a charged
particle. The new theory predicts particle behaviour which is opposite to
convention: for example, that a plasma will decelerate as it moves through a
decreasing magnetic field. Conversely it will accelerate into an increasing
field. The magnetic field of the sun would then act as a restraining influence
on solar plasma ejections. The new theory is developed for two forms of the
magnetic field: an inverse square law and an exponential. The theoretical
results are compared with recent experimental results for the velocity,
deceleration, time and heights of solar jets and spicules. The effect on
Coronal Mass Ejections and Coronal Bright Fronts is also examined.
