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Constraining the Positive Ion Composition in Saturn's Lower Ionosphere with the Effective Recombination Coefficient
Vigren, Erik; Wahlund, Jan-Erik; Dreyer, Joshua +4 more
The present study combines Radio and Plasma Wave Science/Langmuir Probe and Ion and Neutral Mass Spectrometer data from Cassini's last four orbits into Saturn's lower ionosphere to constrain the effective recombination coefficient α300 from measured number densities and electron temperatures at a reference electron temperature of 300 K.…
Modeling of CO Rovibrational Line Emission of HD 141569
Najita, Joan R.; Brittain, Sean D.; Carr, John S. +1 more
HD 141569 is a Herbig Ae/Be star that straddles the boundary between the transition disks and debris disks. It is a low dust mass disk that reveals numerous structural elements (e.g., gaps and rings) that may point to young planets. It also exhibits a reservoir of CO gas observed at both millimeter and IR wavelengths. Previous observations reporte…
Suzaku detection of solar wind charge exchange emission from a variety of highly ionized ions in an interplanetary coronal mass ejection
Katsuda, Satoru; Ezoe, Yuichiro; Yoneyama, Tomokage +8 more
X-ray emission generated through solar-wind charge exchange (SWCX) is known to contaminate X-ray observation data, the amount of which is often significant or even dominant, particularly in the soft X-ray band, when the main target consists of comparatively weak diffuse sources, depending on the space weather during the observation. In particular,…
First year of coordinated science observations by Mars Express and ExoMars 2016 Trace Gas Orbiter
Gondet, B.; Ristic, B.; López-Valverde, M. A. +12 more
Two spacecraft launched and operated by the European Space Agency are currently performing observations in Mars orbit. For >15 years Mars Express has been conducting global surveys of the surface, the atmosphere and the plasma environment of the Red Planet. The Trace Gas Orbiter, the first element of the ExoMars programme, began its science pha…
Venus's induced magnetosphere during active solar wind conditions at BepiColombo's Venus 1 flyby
Miyoshi, Yoshizumi; Plaschke, Ferdinand; Futaana, Yoshifumi +23 more
Out of the two Venus flybys that BepiColombo uses as a gravity assist manoeuvre to finally arrive at Mercury, the first took place on 15 October 2020. After passing the bow shock, the spacecraft travelled along the induced magnetotail, crossing it mainly in the YVSO direction. In this paper, the BepiColombo Mercury Planetary Orbiter Mag…
The dynamics of the broad-line region in NGC 3227
Devereux, Nick
Archival Hubble Space Telescope (HST) observations of the Seyfert 1 nucleus of NGC 3227 obtained with the Space Telescope Imaging Spectrograph (STIS) are re-examined in order to constrain a viable photoionization model for the broad-line region (BLR). The results imply that the BLR is a partially ionized, dust-free, spherical shell that is collaps…
Finding SEIS North on Mars: Comparisons Between SEIS Sundial, Inertial and Imaging Measurements and Consequences for Seismic Analysis
Lognonné, P.; Banerdt, W. B.; Golombek, M. P. +10 more
In this paper, we present the results obtained in the determination of the true north direction on Mars by using a gnomon on the InSight mission and compare the measurements with either the North determination from the Inertial Measurement Unit and imaging analysis. The obtained measurement has been used to populate the SEIS orientation informatio…
Evaluating Pointing Strategies for Future Solar Flare Missions
Ireland, Jack; Christe, Steven D.; Inglis, Andrew R. +1 more
Solar flares are events of intense scientific interest. Although certain solar conditions are known to be associated with flare activity, the exact location and timing of an individual flare on the Sun cannot as yet be predicted with certainty. Missions whose science objectives depend on observing solar flares must often make difficult decisions o…
Application of clustering algorithm to wide stellar pairs for unsupervised search of parts of disrupting clusters
Kovaleva, Dana; Sapozhnikov, Sergei
We introduce the application of the clustering algorithm to the preliminary compiled list of probable wide pairs of co-moving stars. The main aim of such development is a possibility of unsupervised blind search of coeval loose stellar structures over significant regions in space. Using Gaia EDR3 data, we investigated the application of the method…
Small-scale topographic irregularities on Phobos: image and numerical analyses for MMX mission
Michel, Patrick; Miyamoto, Hideaki; Takemura, Tomohiro +2 more
The mothership of the Martian Moons eXploration (MMX) will perform the first landing and sampling on the surface of Phobos. For the safe landing, the 2.1-m-wide mothership of the MMX should find a smooth surface with at most 40 cm topographic irregularity, however, whose abundance or even existence is not guaranteed based on current knowledge. We …