AUTHOR=Albert Jay M. , Longley William J. , Chan Anthony A. TITLE=Estimating quasi-linear diffusion coefficients for varying values of density ratio JOURNAL=Frontiers in Astronomy and Space Sciences VOLUME=11 YEAR=2024 URL=https://www.frontiersin.org/journals/astronomy-and-space-sciences/articles/10.3389/fspas.2024.1470742 DOI=10.3389/fspas.2024.1470742 ISSN=2296-987X