Examinando por Autor "Oliveira, Joana S."

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Acceso Abierto
Constraints on the Spatial Distribution of Lunar Crustal Magnetic Sources From Orbital Magnetic Field Data
(Advancing Earth and Space Science (AGU), 2024-02-14) Oliveira, Joana S.; Vervelidou, Foteini; Wieczorek, Mark A.; Díaz Michelena, M.; Oliveira, Joana S.; Ministerio de Ciencia e Innovación (MICINN); European Research Council (ERC)
Spacecraft measurements show that the crust of the Moon is heterogeneously magnetized. The sources of these magnetic anomalies are yet not fully understood, with most not being related to known geological structures or processes. Here, we use an inversion methodology that relies on the assumption of unidirectional magnetization, commonly referred to as Parker's method, to elucidate the origin of the magnetic sources by constraining the location and geometry of the underlying magnetization. This method has been used previously to infer the direction of the underlying magnetization but it has not been tested as to whether it can infer the geometry of the source. The performance of the method is here assessed by conducting a variety of tests, using synthetic magnetized bodies of different geometries mimicking the main geological structures potentially magnetized within the lunar crust. Results from our tests show that this method successfully localizes and delineates the two-dimensional surface projection of subsurface three-dimensional magnetized bodies, provided their magnetization is close to unidirectional and the magnetic field data are of sufficient spatial resolution and reasonable signal-to-noise ratio. We applied this inversion method to two different lunar magnetic anomalies, the Mendel-Rydberg impact basin and the Reiner Gamma swirl. For Mendel-Rydberg, our analysis shows that the strongest magnetic sources are located within the basin's inner ring, whereas for Reiner Gamma, the strongest magnetic sources form a narrow dike-like body that emanates from the center of the Marius Hills volcanic complex.
Acceso Abierto
Geodesy, Geophysics and Fundamental Physics Investigations of the BepiColombo Mission
(Springer Link, 2021-02-26) Genova, A.; Hussmann, H.; Van Hoolst, T.; Heyner, D.; Less, L.; Santoli, F.; Thomas, N.; Cappuccio, P.; Di Stefano, I.; Kolhey, P.; Langlais, B.; Mieth, J. Z. D.; Oliveira, Joana S.; Stark, A.; Steinbrügge, G.; Tosi, N.; Wicht, J.; Benkhoff, J.; Oliveira, Joana S.; Agenzia Spaziale Italiana (ASI); Bundesministerium für Wirtschaft und Energie (BMWi); Deutsches Zentrum für Luft- und Raumfahrt (DLR); Genova, A. [0000-0001-5584-492X]; Hussmann, H. [0000-0002-3816-0232]; Van Hoolst, T. [0000-0002-9820-8584]; Heyner, D. [0000-0001-7894-8246]; Iess, L. [0000-0002-6230-5825]; Santoli, F. [0000-0003-2493-0109]; Thomas, N. [0000-0002-0146-0071]; Cappuccio, P. [0000-0002-8758-6627]; Di Stefano, I. [0000-0003-1491-6848]; Langlais, B. [0000-0001-5207-304X]; Oliveira, J. S. [0000-0002-4587-2895]; Stark, A. [0000-0001-9110-1138]; Steinbrügge, G. [0000-0002-1050-7759]; Tosi, N. [0000-0002-4912-2848]; Wicht, J. [0000-0002-2440-5091]; Benkhoff, J. [0000-0002-4307-9703]
In preparation for the ESA/JAXA BepiColombo mission to Mercury, thematic working groups had been established for coordinating the activities within the BepiColombo Science Working Team in specific fields. Here we describe the scientific goals of the Geodesy and Geophysics Working Group (GGWG) that aims at addressing fundamental questions regarding Mercury’s internal structure and evolution. This multidisciplinary investigation will also test the gravity laws by using the planet Mercury as a proof mass. The instruments on the Mercury Planetary Orbiter (MPO), which are devoted to accomplishing the GGWG science objectives, include the BepiColombo Laser Altimeter (BELA), the Mercury orbiter radio science experiment (MORE), and the MPO magnetometer (MPO-MAG). The onboard Italian spring accelerometer (ISA) will greatly aid the orbit reconstruction needed by the gravity investigation and laser altimetry. We report the current knowledge on the geophysics, geodesy, and evolution of Mercury after the successful NASA mission MESSENGER and set the prospects for the BepiColombo science investigations based on the latest findings on Mercury’s interior. The MPO spacecraft of the BepiColombo mission will provide extremely accurate measurements of Mercury’s topography, gravity, and magnetic field, extending and improving MESSENGER data coverage, in particular in the southern hemisphere. Furthermore, the dual-spacecraft configuration of the BepiColombo mission with the Mio spacecraft at higher altitudes than the MPO spacecraft will be fundamental for decoupling the internal and external contributions of Mercury’s magnetic field. Thanks to the synergy between the geophysical instrument suite and to the complementary instruments dedicated to the investigations on Mercury’s surface, composition, and environment, the BepiColombo mission is poised to advance our understanding of the interior and evolution of the innermost planet of the solar system.
Acceso Abierto
Vector magnetometry to analyse the Caldereta volcano in the canary islands as a possible terrestrial analogue of mars
(Elsevier, 2025-04-07) Díaz Michelena, M.; Losantos, Emma; Rivero, Miguel Ángel; Oliveira, Joana S.; García Monasterio, Óscar; Mansilla, Federico; Melguizo, Ángel; García Bueno, Jose Luis; Salamanca, David; Fernández Romero, S.; Rivero Rodríguez, Miguel Ángel; Oliveira, Joana S.; Ministerio de Ciencia e Innovación (MICINN); European Research Council (ERC)
Volcanoes are typical features of terrestrial planets' surfaces. Among the different geological processes which give rise to volcanoes, hydromagmatic eruptions are of particular importance for the search of extraterrestrial life since they require the presence of water. Phreatomagmatic eruptions on Mars shall resemble those of the Earth. The possibility to perform magnetic surveys on Mars with magnetometers carried by helicopters opens a new scenario to gain more insights on such features. As a natural first step, gathering a database of terrestrial analogue magnetic signatures is desired, prior to magnetic surveys on the Martian surface. In this work we have selected the Caldereta volcano, a phreatomagmatic edifice in Lanzarote Island (Canary Islands), to perform a magnetic survey using on board drones magnetometry. The acquired data will allow to compare future measurements from other similar structures of the “Red Planet”. The survey casts vector magnetic field data generated by the volcanic edifice. Additionally, we suggest a simplified structure that mimics the geomorphology observed, we attribute a magnetization to such structure and develop a mathematical model that computes its sourced magnetic field. Finally, we develop synthetic models of a volcano on Mars which have been preliminarily classified as hydromagmatic taking Caldereta simulated structure as a reference.