Characteristics of very faint (+16) meteors detected with the Middle Atmosphere ALOMAR Radar System (MAARSY)

Schult, Carsten; Stober, Gunter; Brown, Peter; Pokorný, Petr; Campbell-Brown, Margaret (2020). Characteristics of very faint (+16) meteors detected with the Middle Atmosphere ALOMAR Radar System (MAARSY). Icarus, 340, p. 113444. Elsevier 10.1016/j.icarus.2019.113444

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In September/October 2016 a dedicated specular meteor trail experiment with the high-power, large-aperture MAARSY radar was conducted, combining the high-power density of the radar with the large scattering target of trail echoes with the goal of probing the population of very small, slow-moving meteoroids. In contrast to meteor head echo observations, we find our raw velocity distribution peaks around 19 km/s for meteoroids with a limiting radar magnitude of +16. The correction for different observing biases to an equivalent limiting mass leads to a peak in the meteoroid influx at 13 km/s. Our calculated meteoroid masses range from 10⁻¹¹ to 10⁻⁷ kg. Using an ablation model we show that our detections are near the micrometeorite ablation limit at low speeds. A tentative comparison with a Jupiter Family Comets (JFC) dynamical meteoroid model shows an apparent excess of large, slow meteoroids not predicted by the model.

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