Browsing by Author "Esko, Eero"
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- The BepiColombo Mercury Imaging X-Ray Spectrometer: Science Goals, Instrument Performance and Operations
A2 Katsausartikkeli tieteellisessä aikakauslehdessä(2020-11-03) Bunce, Emma J.; Martindale, Adrian; Lindsay, Simon; Muinonen, Karri; Rothery, David A.; Pearson, Jim; McDonnell, Ivor; Thomas, Chris; Thornhill, Julian; Tikkanen, Tuomo; Feldman, Charly; Huovelin, Juhani; Korpela, Seppo; Esko, Eero; Lehtolainen, Arto; Treis, Johannes; Majewski, Petra; Hilchenbach, Martin; Väisänen, Timo; Luttinen, Arto; Kohout, Tomas; Penttilä, Antti; Bridges, John; Joy, Katherine H.; Alcacera-Gil, Maria Angeles; Alibert, Guilhem; Anand, Mahesh; Bannister, Nigel; Barcelo-Garcia, Corinne; Bicknell, Chris; Blake, Oliver; Bland, Phil; Butcher, Gillian; Cheney, Andy; Christensen, Ulrich; Crawford, Tony; Crawford, Ian A.; Dennerl, Konrad; Dougherty, Michele; Drumm, Paul; Fairbend, Raymond; Genzer, Maria; Grande, Manuel; Hall, Graeme P.; Hodnett, Rosie; Houghton, Paul; Imber, Suzanne; Kallio, Esa; Lara, Maria Luisa; Balado Margeli, Ana; Mas-Hesse, Miguel J.; Maurice, Sylvestre; Milan, Steve; Millington-Hotze, Peter; Nenonen, Seppo; Nittler, Larry; Okada, Tatsuaki; Ormö, Jens; Perez-Mercader, Juan; Poyner, Richard; Robert, Eddy; Ross, Duncan; Pajas-Sanz, Miriam; Schyns, Emile; Seguy, Julien; Strüder, Lothar; Vaudon, Nathalie; Viceira-Martín, Jose; Williams, Hugo; Willingale, Dick; Yeoman, TimThe Mercury Imaging X-ray Spectrometer is a highly novel instrument that is designed to map Mercury’s elemental composition from orbit at two angular resolutions. By observing the fluorescence X-rays generated when solar-coronal X-rays and charged particles interact with the surface regolith, MIXS will be able to measure the atomic composition of the upper ∼10-20 μm of Mercury’s surface on the day-side. Through precipitating particles on the night-side, MIXS will also determine the dynamic interaction of the planet’s surface with the surrounding space environment. MIXS is composed of two complementary elements: MIXS-C is a collimated instrument which will achieve global coverage at a similar spatial resolution to that achieved (in the northern hemisphere only – i.e. ∼ 50 – 100 km) by MESSENGER; MIXS-T is the first ever X-ray telescope to be sent to another planet and will, during periods of high solar activity (or intense precipitation of charged particles), reveal the X-ray flux from Mercury at better than 10 km resolution. The design, performance, scientific goals and operations plans of the instrument are discussed, including the initial results from commissioning in space. - Performance of the Data Handling Pipeline of the SIXS X-Ray Spectrometer onboard BepiColombo
Perustieteiden korkeakoulu | Master's thesis(2017-12-11) Esko, EeroSatellites are used for numerous commercial, military and scientific purposes. Space borne scientific instruments may be used for observations that are not possible on ground. Data from space instruments is mostly processed on ground as part of the activities of the ground segment. The SIXS data handling pipeline was written by the author of this thesis to process raw binary format telemetry data downlinked from the BepiColombo spacecraft into a format suitable for scientific analysis and archival. The software system handles the processing of the data produced by the X-ray and particle spectrometers of the SIXS instrument to the format required for data analysis and the generation of the metadata required for archiving. This thesis presents the pipeline and performance measurement of the pipeline. First an overview of the pipeline structure followed by detailed description of the individual pipeline components. The performance measurement consists of timing the individual pipeline components on several hardware platforms using multiple test data sets as well as the profiling of the components. The runtime of the pipeline was measured and the pipeline was found to perform adequately in nominal use cases. A bug causing data corruption was found in one of the software libraries used by the pipeline. A workaround for the bug is devised. Profiling identified an implementation issue adversely affecting performance in one of the pipeline components. The issue is trivial to fix. This thesis shows that the software system the author developed is suitable for its intended purpose in regard to its performance. - SMART-1 ja Chandrayaan-1 satelliittien XSM -instrumenttien datan muunnos analysointia ja arkistointia varten
Informaatio- ja luonnontieteiden tiedekunta | Bachelor's thesis(2010) Esko, Eero - Solar Intensity X-Ray and Particle Spectrometer SIXS: Instrument Design and First Results
A2 Katsausartikkeli tieteellisessä aikakauslehdessä(2020-08-01) Huovelin, J.; Vainio, R.; Lehtolainen, A.; Kilpua, E.; Korpela, S.; Esko, Eero; Muinonen, K.; Bunce, E.; Martindale, A.; Grande, M.; Andersson, H.; Nenonen, S.; Lehti, Jussi; Schmidt, W.; Genzer, M.; Vihavainen, T.; Saari, J.; Peltonen, J.; Valtonen, E.; Talvioja, M.; Portin, P.; Narendranath, S.; Järvinen, Riku; Okada, T.; Milillo, A.; Laurenza, M.; Heino, E.; Oleynik, P.The Solar Intensity X-ray and particle Spectrometer (SIXS) on the BepiColombo Mercury Planetary Orbiter (“Bepi”) measures the direct solar X-rays, energetic protons, and electrons that bombard, and interact with, the Hermean surface. The interactions result in X-ray fluorescence and scattering, and particle induced X-ray emission (PIXE), i.e. “glow” of the surface in X-rays. Simultaneous monitoring of the incident and emitted radiation enables derivation of the abundances of some chemical elements and scattering properties of the outermost surface layer of the planet, and it may reveal other sources of X-ray emission, due to, for example, weak aurora-like phenomena in Mercury’s exosphere. Mapping of the Hermean X-ray emission is the main task of the MIXS instrument onboard BepiColombo. SIXS data will also be used for investigations of the solar X-ray corona and solar energetic particles (SEP), both in the cruise phase and the passes of the Earth, Venus and Mercury before the arrival at Mercury’s orbit, and the final science phase at Mercury’s orbit. These observations provide the first-ever opportunity for in-situ measurements of the propagation of SEPs, their interactions with the interplanetary magnetic field, and space weather phenomena in multiple locations throughout the inner solar system far away from the Earth, and more extensively at Mercury’s orbit. In this paper we describe the scientific objectives, design and calibrations, operational principles, and scientific performance of the final SIXS instrument launched to the mission to planet Mercury onboard BepiColombo. We also provide the first analysis results of science observations with SIXS, that were made during the Near-Earth Commissioning Phase and early cruise phase operations in 2018–19, including the background X-ray sky observations and “first light” observations of the Sun with the SIXS X-ray detection system (SIXS-X), and in-situ energetic electron and proton observations with the SIXS Particle detection system (SIXS-P).