Search Publications
Mars Express investigations of the Martian ionosphere using ASPERA-3 and new MARSIS fixed frequency modes
Barabash, Stas; Holmstrom, Mats; Sánchez-Cano, Beatriz +7 more
The plasma package Analyzer of Space Plasma and Energetic Atoms (ASPERA-3) onboard Mars Express has observed ions and electrons accelerated by the Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) radar when it operates in its active ionospheric sounding mode. To better study the processes involved, new operational modes for MARS…
Temporal and spatial variation in subsurface cryosphere in East Coprates Planum, Mars
Dasgupta, Dipayan
There is general acceptance among researchers regarding the presence of a cryosphere in the subsurface of Mars. The two main geomorphic indications assumed to support the existence of this cryospheric layer are layered ejecta rampart craters and outflow channels. In essence, a layered ejecta rampart crater is a crater with an ejecta blanket having…
The radiometric environment for Mars limb observations by the Mars Sample Return Earth Return Orbiter
Montmessin, Franck; Titov, Dmitri; Wolff, Michael J. +17 more
After launching from the martian surface via the Mars Ascent Vehicle (MAV), the MAV and the Orbiting Sample (OS) capsule containing the samples collected on Mars by the Perseverance rover are to be identified by the Narrow Angle Camera (NAC) on the Earth Return Orbiter (ERO) spacecraft in order to determine the exact orbit of the capsule before re…
A new approach to retrieve total electron content based on dual-band echoes of MARSIS radar sounder
Wang, Longxiang; Ye, Hongxia
This paper proposes a new dual-band difference (DBD) method to retrieve total electron content (TEC) in Martian ionosphere with the dual-band echoes of the Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS). It establishes the relationship between the group delay difference of two-band echoes and the plasmas frequency. Then the Ma…
Episodic and declining fluvial processes in Noctis Fossae, Syria Planum Province, Mars
Chavan, Anil; Sarkar, Subham; Bhandari, Subhash
The Noachian surfaces across Mars bear abundant evidence for aqueous processes; however, the transformation of the planet from warm and wet to the present-day cold and dry is unclear. A key question is whether these processes continued by the same or different magnitudes in the Hesperian and Amazonian times. The equatorial region of Mars has exten…
On the horizontal currents over the Martian magnetic cusp
Withers, Paul; Majeed, Tariq; AlMutawa, Shahd A. +4 more
Localized crustal magnetization over heavily cratered southern hemisphere at Mars gives rise to open magnetic field configurations which interact with the solar wind magnetic field to form magnetic cusp. The downward acceleration of energetic electrons in these cusps can produce aurora and an extended topside ionospheric structure over regions of …
Wavelet analysis of low frequency plasma oscillations in the magnetosheath of Mars
Fränz, M.; Bolzan, M. J. A.; Echer, E. +1 more
Wavelet analysis was employed to identify the major frequencies present in the plasma oscillations in the Martian magnetosheath. We have selected magnetosheath crossings and applied the Morlet wavelet transform to the electron density and temperature data, obtained from the Analyzer of Space Plasmas and Energetic Atoms experiment (ASPERA-3), onboa…
Using cross correlation to estimate Doppler frequency
Li, Fei; Yan, Jianguo; He, Qingbao +2 more
Doppler frequency estimation with high accuracy is very important for precise orbit determination and scientific studies in deep space exploration. In this paper, we propose a new method which implements cross correlation of only received signals from one single station to estimate Doppler frequency. The algorithm is relatively simple and it can a…
Automated crater detection algorithms from a machine learning perspective in the convolutional neural network era
DeLatte, D. M.; Crites, S. T.; Guttenberg, N. +1 more
Convolutional Neural Networks (CNN) offer promising opportunities to automatically glean scientifically relevant information directly from annotated images, without needing to handcraft features for detection. Crater counting started with hand counting hundreds, thousands, or even millions of craters in order to determine the age of geological uni…
DePhine - The Deimos and Phobos Interior Explorer
Willner, Konrad; Oberst, Jürgen; Pätzold, Martin +15 more
DePhine - Deimos and Phobos Interior Explorer - is a mission proposed in the context of ESA's Cosmic Vision program, for launch in 2030. The mission will explore the origin and the evolution of the two Martian satellites, by focusing on their interior structures and diversity, by addressing the following open questions: Are Phobos and Deimos true …