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EMVIM: An empirical model for the magnetic field configuration near Venus
He, Maosheng; Vogt, Joachim; Zhang, Tielong +1 more
More than 2000 orbits of Venus Express magnetic field measurements are condensed into Empirical Model of Venusian Induced Magnetic fields (EMVIM), an empirical model to quantify the magnetic configuration in the Venusian magnetosphere at low altitude (<500 km) as a function of the upstream solar wind magnetic field (IMF components) and the sola…
Propagation of Solar Energetic Particles During Multiple Coronal Mass Ejection Events
Valtonen, Eino; Pohjolainen, Silja; Al-Hamadani, Firas
We study solar energetic particle (SEP) events during multiple solar eruptions. The analysed sequences, on 24 - 26 November 2000, 9 - 13 April 2001, and 22 - 25 August 2005, consisted of halo-type coronal mass ejections (CMEs) that originated from the same active region and were associated with intense flares, EUV waves, and interplanetary (IP) ra…
Mission accomplished: Rosetta crashes into comet
Gibney, Elizabeth
Craft sends back wealth of images in 19-kilometre descent.
Iron-rich solar particle events measured by SOHO/ERNE during two solar cycles
Vainio, R.; Valtonen, E.; Raukunen, O.
Aims: We study the differences in the heavy ion composition of solar energetic particle (SEP) events between solar cycles 23 and 24.
Methods: We have surveyed the SOHO/ERNE heavy ion data from the beginning of solar cycle 23 until the end of June 2015, that is, well into the declining phase of cycle 24. We used this long observation peri…
Future dedicated Venus-SGG flight mission: Accuracy assessment and performance analysis
Zheng, Wei; Hsu, Houtse; Zhong, Min +1 more
This study concentrates principally on the systematic requirements analysis for the future dedicated Venus-SGG (spacecraft gravity gradiometry) flight mission in China in respect of the matching measurement accuracies of the spacecraft-based scientific instruments and the orbital parameters of the spacecraft. Firstly, we created and proved the sin…
Comparison of diffuse infrared and far-ultraviolet emission in the Large Magellanic Cloud: The data
Shalima, P.; Gogoi, Rupjyoti; Saikia, Gautam +1 more
Dust scattering is the main source of diffuse emission in the far-ultraviolet (FUV). For several locations in the Large Magellanic Cloud (LMC), Far Ultraviolet Spectroscopic Explorer (FUSE) satellite has observed diffuse radiation in the FUV with intensities ranging from 1000 to 3×105 photon units and diffuse fraction between 5% and 20%…
Measuring Structural Parameters Through Stacking Galaxy Images
Li, Yubin; Zheng, Xian Zhong; Gu, Qiu-Sheng +4 more
It remains challenging to detect the low surface brightness structures of faint high-z galaxies, which are key to understanding the structural evolution of galaxies. The technique of image stacking allows us to measure the averaged light profile beneath the detection limit and probe the extended structure of a group of galaxies. We carry out simul…
Gaia benchmark stars and their twins in the Gaia-ESO Survey
Jofré, P.
The Gaia benchmark stars are stars with very precise stellar parameters that cover a wide range in the HR diagram at various metallicities. They are meant to be good representative of typical FGK stars in the Milky Way. Currently, they are used by several spectroscopic surveys to validate and calibrate the methods that analyse the data. I review o…
A variety of radars designed to explore the hidden structures and properties of the Solar System's planets and bodies
Ciarletti, Valérie
Since the very first observations of the Moon from the Earth with radar in 1946, radars are more and more frequently selected to be part of the payload of exploration missions in the Solar System. They are, in fact, able to collect information on the surface structure of bodies or planets hidden by opaque atmospheres, to probe the planet subsurfac…
Evidence for a Very Low-column Density Hole in the Galactic Halo in the Direction of the High Latitude Molecular Cloud MBM 16
Liu, W.; Galeazzi, M.; Ursino, E.
Shadow observations are the only way to observe emission from the galactic halo (GH) and/or the circumgalactic medium (CGM) free of any foreground contamination from local hot bubble (LHB) and solar wind charge exchange (SWCX). We analyzed data from a shadow observation in the direction of the high latitude, neutral hydrogen cloud MBM 16 with Suza…