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MAVEN and MEX Multi-instrument Study of the Dayside of the Martian Induced Magnetospheric Structure Revealed by Pressure Analyses
André, N.; Fedorov, A.; Barabash, S. +9 more
A combination of statistical studies and 18 case studies have been used to investigate the structure of the induced Martian magnetosphere. The different plasma and magnetic pressure forces on the dayside of the induced magnetosphere of Mars have been studied using 3.5 years of Mars Atmosphere and Volatile Evolution (MAVEN) and Mars Express (MEX) o…
Origin of the Extended Mars Radar Blackout of September 2017
Leblanc, François; Witasse, Olivier; Sánchez-Cano, Beatriz +13 more
The Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) onboard Mars Express, which operates between 0.1 and 5.5 MHz, suffered from a complete blackout for 10 days in September 2017 when observing on the nightside (a rare occurrence). Moreover, the Shallow Radar (SHARAD) onboard the Mars Reconnaissance Orbiter, which operates at 20…
The Martian Bow Shock Over Solar Cycle 23-24 as Observed by the Mars Express Mission
Holmström, M.; Wild, J. A.; Lester, M. +2 more
The Martian bow shock position is known to be correlated with solar extreme ultraviolet irradiance. Since this parameter is also correlated with the evolution of the solar cycle, it is expected that the Martian bow shock position should also vary over such a period. However, previous reports on this topic have often proved contradictory. Using 13 …
Electron Density Profiles in the Upper Ionosphere of Mars From 11 Years of MARSIS Data: Variability Due to Seasons, Solar Cycle, and Crustal Magnetic Fields
Gurnett, D. A.; Morgan, D. D.; Halekas, J. +3 more
The Mars Advanced Radar for Subsurface and Ionosphere Sounding on board the Mars Express spacecraft measures the frequency of local plasma oscillations, which can be used to determine electron densities local to the spacecraft. This paper provides an overview of electron densities in the upper Martian ionosphere, obtained by investigating over 400…
Extremely High Plasma Densities in the Mars Ionosphere Associated With Cusp-Like Magnetic Fields
Fallows, K.; Withers, P.; Kopf, A. +1 more
The Martian crustal magnetic field modifies the structure of the ionosphere, the loss of atmosphere to space, and the interactions of the upper atmosphere with the solar wind. The Mars Advanced Radar for Subsurface and Ionosphere Sounding topside sounder on Mars Express has regularly observed oblique echoes from magnetically controlled plasma stru…
Energy Spectral Properties of Hydrogen Energetic Neutral Atoms Emitted From the Dayside Atmosphere of Mars
Barabash, S.; Futaana, Y.; Wurz, P. +3 more
The energy spectrum of hydrogen energetic neutral atoms (HENAs) emitted from the dayside atmosphere of Mars reveals the physical processes of their origin and provides means for remote sensing on the Mars plasma environment. We first compile all available energy spectra of sunward flowing HENA using high-energy resolution data from the neutral par…
Variability of Precipitating Ion Fluxes During the September 2017 Event at Mars
Holmström, M.; Leblanc, F.; Luhmann, J. +15 more
In this work, we study the influence of the September 2017 solar event on the precipitating heavy ion fluxes toward Mars' atmosphere as seen by Mars Atmosphere and Volatile EvolutioN/Solar Wind Ion Analyzer, an energy and angular ion spectrometer and by Mars Atmosphere and Volatile EvolutioN/Suprathermal and Thermal Ion Composition instrument, an …
Enhanced Ionization in Magnetic Anomaly Regions of the Martian Lower Ionosphere Associated With Dust Storms
Haider, S. A.; Venkateswara Rao, N.; Leelavathi, V. +2 more
The Mars Advanced Radar for Subsurface and Ionospheric Sounding instrument aboard the Mars Express spacecraft observes vertical echoes from the normal ionosphere and oblique echoes from ionization bulges. The peak frequencies of these two kinds of echoes are, in general, nearly equal. In the present study, we report the detection of oblique echoes…
Isolated High-Density Structures in Magnetic Anomaly Regions of the Martian Lower Ionosphere
Venkateswara Rao, N.; Leelavathi, V.; Mohanamanasa, P. +1 more
The occurrence of density structures in magnetic anomaly regions is one of the prominent features of the Martian ionosphere. These structures, in general, occur at altitudes above the main peak. In the present study, we analyze four cases of unusually strong oblique echoes that occur in magnetic anomaly regions and are observed by the Mars Express…
Effect of Dust Storm and GCR Impact on the Production Rate of O3+ in MY 28 and MY 29: Modeling and SPICAM Observation
Haider, S. A.; Masoom, J.; Bougher, S. +1 more
We have developed a seasonally dependent energy loss model to calculate the zonally averaged production rates of O3+ due to impact of galactic cosmic rays in the dayside troposphere of Mars between solar longitudes (Ls) 0° and 360° at low latitudes (2°N, 2°S, 25°N, and 25°S), midlatitudes (45°N and 45°S), and high …