Effects of Charged Martian Dust on Martian Atmosphere Remote Sensing

Abstract

In this paper, the extinction property and optical depth of charged Martian dust at infrared band 3 THz–300 THz are studied using the Mie scattering theory. It is found that the extinction coefficients of Martian atmospheric dust and the dust optical depth (DOD) of the Martian atmosphere can be amplified significantly as the dust particles are charged. This extinction amplification has a peak, called amplification resonance, which shifts toward the upper left of the r-q parameter plane with increasing frequency. Here, r denotes the particle radius and q denotes the particle’s total net charge. The amplification of the Martian DOD is more significant at high altitudes than at low altitudes because the particles at high altitudes are smaller. For example, at an altitude of 30–50 km, the dust optical depth at 30 THz can be increased by 60–200%. However, at 3 THz–10 THz, the DOD at the near surface altitude (0–10 km) can still be enhanced by ~80%. This implies that by treating the Martian dust as uncharged particles, the dust density constructed from the Martian DOD data might be overestimated. The estimation error of the dust density of the Martin atmosphere may be reduced by counting the enhancement of the DOD that is caused by charged dust.

Eliminating Massive Martian Dust Storms from Images of Tianwen-1 via Deep Learning

“…After the light transmission, the imaging degradation process can be formulated as in Li et al (2021b): With Equation (1) in mind, we turn to the dusty weather on the Mars (see Figure 2(b)). Considering that dust storms may be non-uniformly distributed in the whole view of the orbiter (see Figure 1(a)), and the multigrained iron oxides suspended in the Martian atmosphere mainly have Mie scattering processes (Gao et al 2022), we rewrite Equation (1) to describe the Martian image degradation process as…”

Deep Learning Eliminates Massive Dust Storms from Images of Tianwen-1

“…Considering that dust storms may be non-uniformly distributed in the whole view of the orbiter (see Fig. 1a), and the multi-grained iron oxides suspended in the Martian atmosphere mainly have Mie scattering processes (Gao et al, 2022), we rewrite Eq. 1 to describe the Martian image degradation process as…”

Effect of the Net Charges Carried by Dust on Martian Atmospheric Temperature

“…Actually, dusty particles are extremely prone to being charged in the Martian atmospheric environment (Farrell et al., 1999; Mazumder et al., 2010). Many studies indicate that the net charges carried by particles have a significant contribution to the extinction of electromagnetic waves (EMWs) (Bohren & Hunt, 1977; Gao et al., 2022; Heinisch et al., 2012; Klačka & Kocifaj, 2007). However, the effect of net charges carried by Martian dust particles on optical properties as well as radiative effects has not been considered in atmospheric models so far.…”