Formation of plasma around a small meteoroid: 1. Kinetic theory

TL;DR

This paper develops a kinetic theory to describe the plasma formation around small meteoroids in Earth's atmosphere, providing analytical tools for interpreting radar data and understanding meteoroid-atmosphere interactions.

Contribution

It introduces a first-principle kinetic model for particle behavior near ablating meteoroids, enabling more accurate analysis of radar observations.

Findings

Analytic expressions for spatial structure of plasma

Velocity distribution models for ions and neutrals

Foundation for improved radar data interpretation

Abstract

Every second millions of small meteoroids enter the Earth's atmosphere producing dense plasmas. Radars easily detect these plasmas and researchers use this data to characterize both the meteoroids and the atmosphere. This paper develops a first-principle kinetic theory describing the behavior of particles, ablated from a fast-moving meteoroid, that colliside with the atmospheric molecules. This theory produces analytic expressions describing the spatial structure and velocity distributions of ions and neutrals near the ablating meteoroid. This analytical model will serve as a basis for a more accurate quantitative interpretation of radar measurements and should help calculate meteoroid and atmosphere parameters from radar head-echo observations.