  In this paper, we perform stability analysis for a class of second and third
order accurate strong-stability-preserving modified Patankar Runge-Kutta
(SSPMPRK) schemes, which were introduced in [4,5] and can be used to solve
convection equations with stiff source terms, such as reactive Euler equations,
with guaranteed positivity under the standard CFL condition due to the
convection terms only. The analysis allows us to identify the range of free
parameters in these SSPMPRK schemes in order to ensure stability. Numerical
experiments are provided to demonstrate the validity of the analysis.
