Intercomparison of radar meteor velocity corrections using different ionization coefficients

Abstract

Sensitive long‐wavelength radar observations of absolute velocity never previously published from Jicamarca are brought to bear on the long‐standing problem of radar detection of slow‐moving meteors. Attention is devoted to evaluating the ionization coefficient β(V) in the critically important velocity range of 11–20 km/s in recent laboratory measurements of Thomas et al. (2016). Theoretical predictions for β(V) based on the laboratory data, on Jones (1997), on Janches et al. (2014), and on Verniani and Hawkins (1964) are used to correct the incoming meteor velocities measured with the sensitive Jicamarca high‐power, large‐aperture radar operating at 6 m wavelength. All corrected distributions are consistent with the predictions of the Nesvorný model in showing pronounced monotonic increases down to the escape velocity (11 km/s). Such distributions may be essential to explaining the pronounced ledge in nighttime electron density and the rapid disappearance of electrons in meteor trails in the altitude range of 80–85 km.

Velocity distribution of larger meteoroids and small asteroids impacting Earth

“…published by Taylor and Elford (1998), Baggaley (2004), or Janches et al (2003). Nonetheless, the more recent works by Moorhead et al (2017) and Williams et al (2017) are also based on radar data and presented velocity distributions similar to the ones derived in this work and the ones in literature based on de-biased NEA models.…”

“…Oldenburg, 14 November 2019 NEMO-PA-004_1_2_velocity-distributions 7 Williams et al (2017) published a study based on meteors detected with the Jicamarca high-power largeaperture radar. They applied different velocity corrections on the data with a detailed evaluation of how the assumed ionization coefficient for incoming meteors in the velocity range between 10 -20 km/s effects the result.…”