Probing of meteor showers at Mars during the encounter of comet C/2013 A1: predictions for the arrival of MAVEN/Mangalyaan

Abstract

We have estimated (1) production rates, (2) ion and electron densities of meteor ablation and (3) ionization for different masses and velocities of meteoroids when comet C/2013 A1 crossed the orbit of Mars on 19 October, 2014 at 18:27 UT. Meteor ablations of small masses < 10⁻⁴g have created a broad layer between altitude ~ 90km and 110km. The meteoroids of large masses ≥  10⁻⁴g are burnt at around 60–90km well below the main ionization peak at altitude ~160 km produced in the nighttime by solar wind particle impact. The production rates and densities of 15 metallic ions (Mg⁺, Fe⁺, Si⁺, MgO⁺, FeO⁺, SiO⁺, MgCO₂⁺, MgO₂⁺, FeCO₂⁺, FeO₂⁺, SiCO₂⁺, SiO₂ ⁺, MgN₂⁺, FeN₂⁺, and SiN₂ ⁺) have been computed self-consistently between altitudes 50km and 150km. The twelve major peaks in the Ion Mass Spectra (IMS) are predicted by our model calculations. Our predicted ion and electron density profiles of metals provide benchmark values that can be observed by plasma probes onboard Mars Express (MEX), Mars Atmosphere and Volatile Evolution (MAVEN) and Mangalyaan.