to magnetic pressure) of a prominence through the study of compression of the prominence material by the Rayleigh-Taylor plumes.

The Observations Needed to Determine a Prominence’s Plasma $\beta$
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Before the methodology through which the prominence plasma $\beta$ can be determined is presented, first we will quickly review the observational characteristics of the prominence plumes that are important for this analysis. The points we need to remember are [@BERG2010]:

-   The plumes have a phase in their evolution where they rise at an approximately constant velocity

-   The plumes have an approximately circular (elliptical) head

-   The intensity of the prominence material at the top of the plume is greater than the average prominence intensity.

-   Flows of material can be observed along the head of the plume

To make it possible to use these observables, a number of assumptions are necessary. The first is in relation to the density of the prominence. The prominence intensity is known to be a result of scattering. Therefore the intensity is directly related to the column density of the prominence. This allows us to assume that the intensity can be used as a proxy for the density. Hence the bright top of the 