Search Publications
Multi-Spacecraft Magnetic Field Reconstructions: A Cross-Scale Comparison of Methods
Klein, K. G.; Broeren, T.; TenBarge, J. M.
Space plasma studies frequently use in situ magnetic field measurements taken from many spacecraft simultaneously. A useful data product of these measurements is the reconstructed magnetic field in a volume near the spacecraft observatory. We compare a standard Linear method of computing the magnetic field at arbitrary spatial points to two novel …
A Database for Simultaneous Observations of the Earth's Magnetosheath by Cluster and MMS Between 2017 and 2021
Voitcu, Gabriel; Echim, Marius; Munteanu, Costel +4 more
This paper describes a catalog of simultaneous observations of the Earth's magnetosheath by ESA's Cluster and NASA's MMS missions. The catalog is built from a visual inspection of summary plots provided by the two missions complemented by an analysis of high-resolution magnetic field data. The catalog includes 117 events when Cluster 4 and MMS 4 c…
Martian Ozone Observed by TGO/NOMAD-UVIS Solar Occultation: An Inter-Comparison of Three Retrieval Methods
Aoki, S.; Vandaele, A. C.; Daerden, F. +16 more
The NOMAD-UVIS instrument on board the ExoMars Trace Gas Orbiter has been investigating the Martian atmosphere with the occultation technique since April 2018. Here, we analyze almost two Mars Years of ozone vertical distributions acquired at the day-night terminator. The ozone retrievals proved more difficult than expected due to spurious detecti…
A High-Resolution Digital Terrain Model Mosaic of the Mars 2020 Perseverance Rover Landing Site at Jezero Crater
Tao, Yu; Muller, Jan-Peter; Xiong, Siting +2 more
We demonstrate the capabilities of a published MADNet monocular height estimation network in producing a refined digital terrain model (DTM) mosaic at 50 cm/pixel resolution for the Mars 2020 Perseverance rover landing site in Jezero crater on Mars. Our approach utilizes the publicly available Mars 2020 Terrain Relative Navigation (TRN) High-Resol…
Mid-Infrared Spectroscopy of Feldspars From the Bühl Basalt (Northern Hesse, Germany) Formed Under Reducing Conditions as Terrestrial Analogue of Mercury for MERTIS
Hiesinger, Harald; Helbert, Jörn; Weber, Iris +6 more
The MErcury Radiometer and Thermal Infrared Spectrometer instrument onboard the BepiColombo spacecraft is designed to investigate Mercury's surface in the mid-infrared (mid-IR). Based on MESSENGER data and modeling, Mercury is thought to be evolved under highly reducing conditions (e.g., McCubbin et al., 2017,
An Integrated Nonlinear Analysis (INA) Software for Space Plasma Turbulence
Echim, Marius; Munteanu, Costel; Kovács, Péter
We built an integrated nonlinear analysis software (INA)-designed to study space plasma turbulence and intermittency. The MATLAB programming environment was used for the algorithmic development and implementation of methods for spectral analysis, multiscale fluctuations and multifractal analysis. The performance of INA is demonstrated using magnet…
Classifying Interplanetary Discontinuities Using Supervised Machine Learning
Munteanu, Costel; Dumitru, Daniel
Directional discontinuities (DDs) are defined as abrupt changes of the magnetic field orientation. We use observations from ESA's Cluster mission to compile a database of events: Four thousand two hundred and sixteen events are identified in January-April 2007, and 5,194 in January-April 2008. Localized time scale images depicting angular changes …
Geometric Calibration of the ESA Mars Express Orbiter High Resolution Stereo Camera
Li, D.; Li, J.; Liu, W. +3 more
The high-resolution stereo camera mounted on the Mars Express (MEX) spacecraft of the European Space Agency is specifically designed for planetary photogrammetry and mapping missions. High-precision geometric calibration is required to maintain the geometric quality of satellite imaging. This study aimed to develop a Martian geometric calibration …
Simplified Automatic Atmospheric Correction for THEMIS Infrared Data
Edwards, Christopher S.; Rogers, A. Deanne; Ye, Cheng +1 more
Thermal infrared spectral data from the Thermal Emission Imaging System (THEMIS) on Mars Odyssey can provide diagnostic information to characterize Martian surface compositions. Accurately isolating the atmospheric contribution from the thermal radiance of THEMIS data is essential for surface mineralogy analysis. In this work, we present improved …
Characterization of the Candidate Landing Region for Tianwen-1—China's First Mission to Mars
Liu, Wai Chung; Wu, Bo; Li, Yuan +7 more
This paper presents our efforts to characterize the candidate landing region (109°-133°E, 23°-30°N) for Tianwen-1, China's first mission to Mars, in terms of engineering safety and scientific significance. Topographic analysis reveals that the region has a low elevation around −4,230 m, and 98% of the region have slopes smaller than 8°. The geomor…