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Publication - Dr James Wookey

    Bolide airbursts as a seismic source for the 2018 Mars InSight mission

    Citation

    Stevanović, J, Teanby, NA, Wookey, J, Selby, N, Daubar, IJ, Vaubaillon, J & Garcia, R, 2017, ‘Bolide airbursts as a seismic source for the 2018 Mars InSight mission’. Space Science Reviews.

    Abstract

    In 2018, NASA will launch InSight, a single-station suite of geophysical instruments, designed to characterise the martian interior. We investigate the seismo-acoustic signal generated by a bolide entering the martian atmosphere and exploding in a terminal airburst, and assess this phenomenon as a potential observable for the SEIS seismic payload. Terrestrial analogue data from four recent events are used to identify diagnostic airburst characteristics in both the time and frequency domain.

    In order to estimate a potential number of detectable events for InSight, we rst model the impactor source population from observations made on the Earth, scaled for planetary radius, entry velocity and source density.We go on to calculate a range of potential airbursts from the larger incident impactor population. We estimate there to be 1000 events of this nature per year on Mars. To then derive a detectable number of airbursts for InSight, we scale this number according to atmospheric attenuation, air-to-ground coupling ineciencies and by instrument capability for SEIS. We predict between 10{200 detectable events per year for InSight.

    Full details in the University publications repository