Joshua S. Méndez Harper studies electrostatic charging in granular materials through laboratory and field experiments. His Portland State profile connects frictional charging with phenomena ranging from clumping during grinding to electrical activity in volcanic plumes.[ref]
He also coauthored the generalized gas-discharge paper, contributing validation and formal analysis.[ref]
A Generalized Townsend's Theory for Paschen Curves in Planar, Cylindrical, and Spherical Geometries in Planetary Atmospheres by Jeremy A. Riousset and others. Author contributions
Charging particles and initiating a discharge are distinct physical questions: collisions can create a distribution of charge, while the resulting electric field must still support ionization and current through the surrounding gas. Measuring both particle charge and discharge conditions therefore tests more than observing a visible spark.
Portrait of Joshua S. Méndez Harper
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