Dust storm and electron density in the equatorial D region ionosphere of Mars: Comparison with Earth's ionosphere from rocket measurements in Brazil

We report the first model result for the dust densities and electron densities in the D region ionosphere of Mars for aerosol particles of different sizes during a major dust storm that occurred in Martian Year (MY) 25 at low latitude. These calculations are made at latitude 10 degrees S and solar longitudes (Ls)=200 degrees, 220 degrees, 250 degrees, and 280 degrees for high, medium, low, and absence of dust storms, respectively. Four corresponding dust layers were found at 50km, 50km, 38km, and 25km during these events. During high dust storm period, the optical depth and dust density increased by a factor of similar to 20 from its normal condition. The electron densities estimated for the D region ionosphere of Mars for submicron sized dust particles are largest as compared to that estimated for larger particles. The electron density reduced by similar to 2 orders of magnitude during high dust storm. The estimated electron density in the clear atmosphere of Mars is compared with measurements of Earth's ionosphere at nearly the same geophysical condition.