Persona: Oliveira, Joana S.
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Oliveira
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Joana S.
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Publicación Restringido Anisotropic magnetoresistance (AMR) instrument to study the Martian magnetic environment from the surface: expected scientific return(Springer Link, 2023-08-15) Díaz Michelena, M.; Fernández Romero, S.; Adeli, Solmaz; Henrich, Clara; Aspás, Alberto; Parrondo, M. C.; Rivero Rodríguez, Miguel Ángel; Oliveira, Joana S.; Instituto Nacional de Técnica Aeroespacial (INTA); Centros de Excelencia Severo Ochoa, BARCELONA SUPERCOMPUTING CENTER (BSC), SEV2015-0493The ExoMars programme has the objective to answer to the question of whether life ever existed on Mars. The second mission comprising the Rosalind Franklin rover and Kazachok Surface Platform was designed to focus specifically on the characterization of the environmental parameters which can play an important role for the existence of life on the surface of the planet. One of these parameters is the magnetic field because of its ability of shielding the solar and cosmic radiation. For such characterization, the scientific suite of the Surface Platform counts with two instruments: the Anisotropic MagnetoResistance (AMR) and the MArtIan Ground ElectromagneTic (MAIGRET) instruments. The AMR goal is to characterize both the surface and subsurface and the time-varying magnetic fields, related to the crustal and the external fields respectively, at the ExoMars landing site in Oxia Planum. The operation to achieve these goals includes two phases, the first phase corresponding to the lander descent and the second phase in which the instrument is deployed on the surface. In this work, we simulate the first operations phase using synthetic magnetic field models, assuming that the different crustal units at the landing site might be magnetized. We also perform measurements in our laboratory to simulate the second phase operation of the instrument on the Martian surface. We discuss the capability of interpretation of the instrument, based on the available information of the landing site and the results from our models.Publicación Restringido A New Large-Scale Map of the Lunar Crustal Magnetic Field and Its Interpretation(Advancing Earth and Space Science AGU, 2021-02-23) Hood, L. L.; Torres, C. B.; Wieczorek, Mark A.; Stewart, S. T.; Oliveira, Joana S.; National Aeronautics and Space Administration (NASA)A new large-scale map of the lunar crustal magnetic field at 30 km altitude covering latitudes from 65°S to 65°N has been produced using high-quality vector magnetometer data from two complementary polar orbital missions, Lunar Prospector and SELENE (Kaguya). The map has characteristics similar to those of previous maps but better resolves the shapes and distribution of weaker anomalies. The strongest group of anomalies is located on the northwest side of the South Pole-Aitken basin approximately antipodal to the Imbrium basin. On the near side, both strong isolated anomalies and weaker elongated anomalies tend to lie along lines oriented radial to Imbrium. These include named anomalies such as Reiner Gamma, Hartwig, Descartes, Abel, and Airy. The statistical significance of this tendency for elongated anomalies is verified by Monte Carlo simulations. Great circle paths determined by end points of elongated anomaly groups and the locations of five individual strong anomalies converge within the inner rim of Imbrium and intersect within the Imbrium antipode zone. Statistically significant evidence for similar alignments northwest of the Orientale basin is also found. The observed distribution of anomalies on the near side and the location of the strongest anomaly group antipodal to Imbrium are consistent with the hypothesis that iron from the Imbrium impactor was mixed into ejecta that was inhomogeneously deposited downrange in groups aligned radial to the basin and concentrated antipodal to the basin.Publicación Acceso Abierto BepiColombo Science Investigations During Cruise and Flybys at the Earth, Venus and Mercury(Springer Link, 2021-02-11) Mangano, V.; Dósa, M.; Franz, M.; Milillo, A.; Joo Lee, Y.; McKenna Lawlor, S.; Grassi, D.; Heyner, D.; Kozyrev, A. S.; Peron, R.; Helbert, J.; Besse, S.; De la Fuente, S.; Montagnon, E.; Zender, J.; Volwerk, M.; Chaufray, J. Y.; Slavin, J. A.; Krüger, H.; Maturilli, A.; Cornet, T.; Iwai, K.; Miyoshi, Y.; Lucente, M.; Massetti, S.; Schmidt, C. A.; Dong, C.; Quarati, F.; Hirai, T.; Varsani, A.; Belyaev, D. A.; Zhong, J.; Kilpua, E. K. J.; Jackson, B. V.; Odstrcil, D.; Plaschke, F.; Vainio, R.; Jarvinen, R.; Ivanovsky, S. L.; Madár, A.; Erdos, G.; Plainaki, C.; Plainaki, C.; Alberti, T.; Alberti, T.; Aizawa, S.; Benkhoff, J.; Murakami, G.; Quemerais, E.; Hiesinger, H.; Mitrofanov, I. G.; Iess, L.; Santoli, F.; Orsini, S.; Lichtenegger, H.; Laky, G.; Barabash, S.; Moissl, R.; Huovelin, J.; Kasaba, Y.; Saito, Y.; Kobayashi, H.; Baumjohann, W.; Oliveira, Joana S.; European Research Council (ERC); National Aeronautics and Space Administration (NASA); Mangano, V. [0000-0002-9903-4053]The dual spacecraft mission BepiColombo is the first joint mission between the European Space Agency (ESA) and the Japanese Aerospace Exploration Agency (JAXA) to explore the planet Mercury. BepiColombo was launched from Kourou (French Guiana) on October 20th, 2018, in its packed configuration including two spacecraft, a transfer module, and a sunshield. BepiColombo cruise trajectory is a long journey into the inner heliosphere, and it includes one flyby of the Earth (in April 2020), two of Venus (in October 2020 and August 2021), and six of Mercury (starting from 2021), before orbit insertion in December 2025. A big part of the mission instruments will be fully operational during the mission cruise phase, allowing unprecedented investigation of the different environments that will encounter during the 7-years long cruise. The present paper reviews all the planetary flybys and some interesting cruise configurations. Additional scientific research that will emerge in the coming years is also discussed, including the instruments that can contribute.Publicación Restringido Asymmetric Magnetic Anomalies Over Young Impact Craters on Mercury(AGU, 2021-02-01) Galluzzi, V.; Wright, Jack; Rothery, D. A.; Hood, L. L.; Oliveira, Joana S.; National Aeronautics and Space Administration (NASA); Agenzia Spaziale Italiana (ASI); European Commission (EC)Mercury's crustal magnetic field map includes anomalies that are related to impact craters. Mercury's surface has a low iron abundance, but it is likely that some impactors brought magnetic carriers able to register the planet's magnetic field that was present during impact. Anomalies associated with the relatively young Rustaveli and Stieglitz craters are asymmetric with respect to the crater center. We analyze the location of the magnetic anomalies and the impact crater morphologies to understand whether there is any correlation. We investigate the geological framework of these two craters to constrain the overall impact dynamics. In both cases, magnetic anomalies correlate well with the location of impact melt and the inferred impact direction. Both impact angles were probably 40°–45°, with preferential distribution of the melt downrange. Inversion dipoles suggest that the impact melt located downrange encompasses some magnetized material, which is hence likely responsible for the detected magnetic anomalies. We observe strong crustal magnetic field imprints near two recent craters on Mercury. We know that the crust of rocky planets may include magnetic elements like iron that can record the local magnetic field under certain circumstances. However, Mercury's crust is known to be remarkably poor in iron. In this study, we want to find out whether these observed magnetic imprints near craters happened by chance or if it can be explained by the impactors bringing iron to Mercury's surface. We make a joint-study of two different scientific areas: Geology and geophysics. Via the geological study, we found an uneven distribution of “impact melt,” which is material flung out of the crater in molten form during the impact that made the crater. Via the geophysical study, we found evidence that magnetized material correlates with the position of those pools that are found in the downrange direction of the impact. In conclusion, this study supports the hypothesis that iron was brought on Mercury by the impactors.Publicación Restringido Magnetic Anomalies in Five Lunar Impact Basins: Implications for Impactor Trajectories and Inverse Modeling(Advancing Earth and Space Science AGU, 2020-12-30) Hood, L. L.; Andrews Hanna, J. J.; Wieczorek, Mark A.; Stewart, S. T.; Oliveira, Joana S.; National Aeronautics and Space Administration (NASA)A recent large-scale map of the lunar crustal magnetic field is examined for the existence of magnetic anomalies internal to ringed impact basins. It is found that, of 25 basins with upper preNectarian and younger ages, 18 contain mapped internal anomalies with amplitudes of at least 1 nT at 30 km altitude. Of these, five are most confidently judged to contain intrinsic anomalies (i.e., anomalies located within the inner basin rims and originating at the times of basin formation): Crisium, Humboldtianum, Mendel-Rydberg, Moscoviense, and Nectaris. Comparing the anomaly distributions with previous numerical simulations of the impact of iron-rich planetesimals to form a large (SPA-sized) basin, inferences are drawn about the likely trajectories of the impactors. Specifically, results suggest that impactor trajectories for these basins were within ∼45° of being vertical and tended to lie on average parallel to the lunar equatorial plane and the ecliptic plane. Inverse modeling of anomalies within these basins yields inferred directions of magnetization that are difficult to reconcile with the axial centered dipole hypothesis for the geometry of the internal lunar dynamo field: Paleomagnetic pole positions are widely scattered and, in agreement with a recent independent study, the two main anomalies within Crisium yield significantly different directions of magnetization.
