Preliminary results from the 2016-2024 MAARSY meteor head echo survey

Radar observations of meteor head echoes provide information about the sizes, orbital elements, and atmospheric interactions of microgram-sized dust particles entering the Earth's atmosphere. This work presents preliminary results from an ongoing effort to create a catalog of $10^6$ high-quality meteor head echoes selected from approximately $10^7$ automated meteor head echo detections. The meteors have been observed using the Middle Atmosphere Alomar Radar System (MAARSY) in Andenes, Northern Norway. The catalog includes nearly continuous observations from 2016 to 2024. The catalog contains data on atmospheric trajectories, Doppler shifts, and radar cross-section estimates for each meteor. Atmospheric interactions are modeled using a simplified approach that attributes deceleration solely to atmospheric drag, with each meteor characterized by a single mass-to-area ratio. Atmospheric density is determined using the NRLMSIS 2.0 atmospheric model. For each meteor, Keplerian orbital elements are calculated using the REBOUND numerical propagator, which is employed to remove the influence of the Earth-Moon system prior to atmospheric entry. The catalog can be used to study micrometeoroids on Earth-crossing orbits as well as to analyze the atmospheric entry dynamics of meteoroids.