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Дисертації з теми "Planetary Gravity"

Автор: Grafiati

Опубліковано: 3 червня 2025

Оновлено: 31 липня 2025

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1

Wright, Corwin. "Detection of stratospheric gravity waves using HIRDLS data." Thesis, University of Oxford, 2010. http://ora.ox.ac.uk/objects/uuid:ef4aa65d-67c1-43ac-90de-1b5bda6c8230.

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Temperature measurements from the HIRDLS instrument on NASA's Aura satellite are analysed for the purposes of detecting and studying internal gravity waves in the terrestrial stratosphere. A detailed description of the methodology used to obtain these data is given, including details of the instrument correction processes used to compensate for errors introduced by a blockage in the instrument optics. A short precis of the relevant theoretical considerations related to atmospheric gravity waves is then outlined. The thesis then discusses the use of the Stockwell (time-frequency) Transform for

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2

Hoffmann, Peter. "Planetary Wave Coupling between Stratosphere and Ionosphere by Gravity Wave Modulation." Doctoral thesis, Universitätsbibliothek Leipzig, 2011. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-71533.

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The ionosphere-thermosphere can be considered to a certain degree as a system, which is externally-driven by the extreme-ultraviolet solar radiation. The main components in the regular variation are connected to the solar cycle, solar rotation and the diurnal cycle. However, anomalies and periodicities of several days, which cannot be related to changes in the solar activity at all times, were detected in ionospheric parameters. It is assumed that the total variation in the ionosphere is partly forced by waves coming from below. This thesis provides a clearer picture of the seasonal changes of

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3

Krishnamurthy, Venkataramanaiah. "The slow manifold and the persisting gravity waves." Thesis, Massachusetts Institute of Technology, 1985. http://hdl.handle.net/1721.1/54304.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1985.<br>Microfiche copy available in Archives and Science.<br>Bibliography: leaves 144-146.<br>by Venkataramanaiah Krishnamurthy.<br>Ph.D.

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4

Lyon-Caen, Hélène. "Deep structure of the Himalaya and Tibet from gravity and seismological data." Thesis, Massachusetts Institute of Technology, 1985. http://hdl.handle.net/1721.1/54953.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1986.<br>Microfiche copy available in Archives and Science<br>Includes bibliographies.<br>by Hélène Lyon-Caen.<br>Ph.D.

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5

Ermakov, Anton. "Geophysical investigation of Vesta, Ceres and the Moon using gravity and topography data." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/108901.

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Thesis: Ph. D. in Planetary Science, Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences, 2017.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 236-262).<br>The shape and gravity field are fundamental properties of a planetary body. Combining gravity and topography data sets is, arguably, the most powerful tool to study planetary interiors from orbit. However, even when gravity and topography data are in hand, typically, a wide range of possible geophysical structures is possible. The reader will find that this

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6

Nappo, Carmen Joseph. "A theoretical investigation of gravity-wave-generated stress and vorticity in the planetary boundary layer." Diss., Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/25697.

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7

Lee, Sang-Mook. "Tectonics of the East Pacific rise : studies of faulting characteristics and magnetic and gravity anomalies." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/54403.

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8

Chappell, Steven Patrick. "Analysis of planetary exploration spacesuit systems and evaluation of a modified partial-gravity simulation technique." Diss., Connect to online resource, 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3219007.

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9

Hoffmann, Peter, and Christoph Jacobi. "Connection of Planetary Waves in the Stratosphere and Ionosphere by the Modulation of Gravity Waves." Universität Leipzig, 2010. https://ul.qucosa.de/id/qucosa%3A16359.

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A possible connection of planetary waves (PW) and ionospheric planetary wave type oscillations (PWTO) at midlatitudes is studied by analyzing MetOffice stratospheric reanalysis data and maps of the Total Electron Content. Although the seasonal variability looks similar, the vertical coupling between stratosphere and ionosphere is known to only happen indirectly through processes such as the modulation of gravity waves (GW) by PW. To investigate possible coupling processes, information about GW are retrieved from SABER temperature profiles (30-130 km) by calculating the potential energy (Ep) an

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10

Simons, Mark. "Localization of gravity and topography : constraints on the tectonics and mantle dynamics of Earth and Venus." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/58356.

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11

Mazarico, Erwan Matías Alexandre 1981. "Precise orbit determination of the Mars Odyssey spacecraft and geodetic inversion for the Martian gravity field." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/28611.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 2004.<br>Includes bibliographical references (leaves 73-75).<br>Remote sensing techniques are widely used in planetary science for acquiring precise, global inforniation about an object. One of these techniques consists of the study of the radio signals emitted by a spacecraft, from which it is possible to derive the forces acted upon it. For this project, we used the radio science data from the Mars-orbiting spacecraft "IMars Odyssey". Launched in April 2001, more than two years of daily

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12

Jin, Yu 1959. "State-of-stress and rheology of Tibet and its vicinity from gravity anomalies and numerical models." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/54429.

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13

Rosenburg, Margaret Anne. "Predicted and observed free-air gravity anomalies for delamination models of the formation of the Siberian Flood Basalts." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/114338.

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Thesis: S.B., Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences, 2007.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (page 30).<br>The mechanism responsible for the formation of the Siberian Flood Basalts (SFB) has yet to be discovered and adequately quantified. One theory proposes that thinning of the lithosphere due to delamination triggered the eruption. This model is characterized by a drip of denser material within the mantle, and because it involves a density-driven process, calculations of predicted gravity

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14

Panasyuk, Svetlana Valeryevna 1965. "The effect of compressibility, phase transformations, and assumed density structure on mantle viscosity inferred from earth's gravity field." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/55056.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1998.<br>Includes bibliographical references (p. 147-148).<br>by Svetlana, Valeryevna Panasyuk.<br>Ph.D.

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15

Norton, Andrew David. "Analysis of Ionospheric Data Sets to Identify Periodic Signatures Matching Atmospheric Planetary Waves." Thesis, Virginia Tech, 2021. http://hdl.handle.net/10919/101791.

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Atmospheric planetary waves play a role in introducing variability to the low-latitude ionosphere. To better understand this coupling, this study investigates times when oscillations seen in both atmospheric planetary waves and ionospheric data-sets have similar periodicity. The planetary wave data-set used are temperature observations made by Sounding of the Atmosphere using Broadband Emission Radiometry (SABER). These highlight periods during which 2-Day westward propagating wave-number 3 waves are evident in the mesosphere and lower thermosphere. The ionospheric data-set is Total Electron C

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16

Ritzer, Jason Andreas. "The Topography, Gravity, and Tectonics of the Terrestrial Planets." Case Western Reserve University School of Graduate Studies / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=case1278603504.

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17

Beissner, Kenneth C. "Studies of Mid-lattitude Mesospheric Temperature Variability and Its Relationship to Gravity Waves, Tides, and Planetary Waves." DigitalCommons@USU, 1997. https://digitalcommons.usu.edu/etd/4687.

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Temperature observations of the middle atmosphere have been carried out from September 1993 through July 1995 using a Rayleigh backscatter lidar located at Utah State University (42°N, lii0W). Data have been analyzed to obtain absolute temperature profi les from 40 to 90 km. Various sources of error were reviewed in order to ensure the quality of the measurements. This included conducting a detailed examination of the data reduction procedure, integration methods, and averaging techniques. eliminating errors of 1-3%. The temperature structure climatology has been compared with several other mi

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18

Aveiro, Henrique Carlotto. "Electric and magnetic field signatures of gravity waves and 2-day planetary waves in the equatorial E-region." Instituto Nacional de Pesquisas Espaciais, 2009. http://urlib.net/sid.inpe.br/mtc-m18@80/2008/12.16.11.31.

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Observações do eletrojato equatorial (EEJ) utilizando radares VHF mostram ecos retro-espalhados em dois tipos de irregularidades de densidade eletrônica, explicadas pelas instabilidades de dois-feixes modificada (ecos Tipo I) e deriva de gradiente (ecos Tipo II). Das velocidades das irregularidades Tipo II obtidas de dados de radar, inferimos os campos elétricos verticais (E_z). A análise harmônica de tais campos mostra a presença de campos elétricos induzidos por ondas de gravidade (GW) no EEJ. Calculamos a razão entre os campos elétricos relacionados a GW e o campo elétrico vertical total. E

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19

Hoffmann, Peter [Verfasser], Christoph [Akademischer Betreuer] Jacobi, and Hermann [Gutachter] Lühr. "Planetary Wave Coupling between Stratosphere and Ionosphere by Gravity Wave Modulation / Peter Hoffmann ; Gutachter: Hermann Lühr ; Betreuer: Christoph Jacobi." Leipzig : Universitätsbibliothek Leipzig, 2011. http://d-nb.info/1237894883/34.

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20

Mamatsashvili, George. "Dynamics of perturbation modes in protoplanetary discs : new effects of self-gravity and velocity shear." Thesis, University of Edinburgh, 2011. http://hdl.handle.net/1842/5283.

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Protoplanetary discs, composed of gas and dust, usually surround young stellar objects and serve two main purposes: they determine the accretion of matter onto the central object and also represent sites of planet formation. The accretion proceeds through the transport of angular momentum outwards allowing the disc matter to fall towards the centre. A mechanism responsible for the transport can be turbulence, waves or other coherent structures originating from various instabilities in discs that could, in addition, play a role in the planet formation process. For an understanding of these inst

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21

Ohiwa, Mitchihiro 1977. "An experimental study on mixing induced by gravity currents on a sloping bottom in a rotating fluid." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/55068.

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Thesis (S.M.)--Joint Program in Physical Oceanography (Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences and the Woods Hole Oceanographic Institution), 2002.<br>Includes bibliographical references (p. 75-77).<br>Mixing induced by gravity currents on a sloping bottom was studied through laboratory experiments in a rotating fluid. The dense fluid on the sloping bottom formed a gravity current that could be in regimes where the flow was laminar or had waves. The mixing on a sloping bottom for gravity currents in the laminar and wave regimes was studied bot

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22

Sathishkumar, S. "Studies of the dynamical coupling to the equatorial middle atmosphere." Thesis, Indian Institute of Geomagnetism, Mumbai, 2011. http://localhost:8080/xmlui/handle/123456789/220.

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23

Di, Ruscio Andrea. "Utilisation des données de radio science pour la construction d’éphémérides planétaires." Thesis, Université Côte d'Azur, 2021. http://www.theses.fr/2021COAZ4031.

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Le thème central de la thèse concerne l’utilisation des données de radio tracking pour le développement d’éphémérides planétaires, en particulier, dans deux cas : 1) analyse de données de navigation de la mission Cassini pour améliorer les éphémérides de Saturne et augmenter notre connaissance du système solaire externe ; 2) simulation des données radio de la mission ESA BepiColombo collectées durant la phase orbital à Mercure, pour évaluer leur contribution sur le développement des éphémérides planétaire de l’Intégrateur Numérique Planétaire de l’Observatoire de Paris (INPOP).Le premier sujet

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24

Williams, Paul David. "Nonlinear interactions of fast and slow modes in rotating, stratified fluid flows." Thesis, University of Oxford, 2003. http://ora.ox.ac.uk/objects/uuid:5365c658-ab60-41e9-b07b-0f635909835e.

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This thesis describes a combined model and laboratory investigation of the generation and mutual interactions of fluid waves whose characteristic scales differ by an order of magnitude or more. The principal aims are to study how waves on one scale can generate waves on another, much shorter scale, and to examine the subsequent nonlinear feedback of the short waves on the long waves. The underlying motive is to better understand such interactions in rotating, stratified, planetary fluids such as atmospheres and oceans. The first part of the thesis describes a laboratory investigation using a r

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25

Jacobi, Ch, K. Fröhlich, and A. Pogoreltsev. "Gravity wave flux modulation by planetary waves in a circulation model." 2005. https://ul.qucosa.de/id/qucosa%3A15930.

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Mit Hilfe eines Zirkulationsmodells der mittleren Atmosphäre wird die Ausbreitung der Quasi-Zwei-Tage-Welle simuliert. Das Modell verfügt über eine aktuelle Schwerewellenparametrisierung und ermöglicht daher die detaillierte Beschreibung der Wechselwirkung planetarer Wellen mit Schwerewellen. Bei Anwesenheit der Quasi-Zwei-Tage-Welle wird der Schwerewellenfluss mit der Periode von zwei Tagen und der räumlichen Struktur der Quasi- Zwei-Tage-Welle moduliert. Modellergebnisse zeigen, dass sich die Quasi-Zwei-Tage-Welle nicht gut in die untere Thermosphäre ausbreitet. Phasenvergleiche zwischen Qua

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26

LUCENTE, MARCO. "Gravity gradiometers for planetary geodesy: requirements and concept for a space instrument." Doctoral thesis, 2021. http://hdl.handle.net/11573/1632206.

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The measurement of the gravitational field of Solar System bodies is becoming ever and ever crucial in the physical description of their composition, state and evolution. Indeed, many planetary processes at large scale are ruled by their internal structure, where surface and tectonic features are mainly the result of heat exchanges from the interior to the surface. Gravity field measurements are one of the observational methods to investigate those processes and to place constraints on the structure of the planetary interiors and on the formation and geologic evolution of a planet. The ret

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27

"Design and Development of Rolling and Hopping Ball Robots for Low Gravity Environment." Master's thesis, 2016. http://hdl.handle.net/2286/R.I.38691.

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abstract: In-situ exploration of planetary bodies such as Mars or the Moon have provided geologists and planetary scientists a detailed understanding of how these bodies formed and evolved. In-situ exploration has aided in the quest for water and life-supporting chemicals. In-situ exploration of Mars carried out by large SUV-sized rovers that travel long distance, carry sophisticated onboard laboratories to perform soil analysis and sample collection. But their large size and mobility method prevents them from accessing or exploring extreme environments, particularly caves, canyons, cliffs a

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28

DURANTE, DANIELE. "The gravity fields of Jupiter and Saturn as determined by Juno and Cassini." Doctoral thesis, 2018. http://hdl.handle.net/11573/1153301.

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This Doctoral Thesis reports on the analysis procedure for the data acquired by Juno and Cassini in the last year with the aim of determining, respectively, Jupiter and Saturn’s gravity fields. The radio science investigation exploits the Doppler shift of a microwave signal to precisely determine the Earth-Spacecraft radial velocity and to estimate the gravity field harmonic coefficients, along with other dynamical parameters. The basic concepts of Doppler data and orbit determination are reported. A discussion on the esti- mated gravity fields is presented, as well as the implications for the

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29

Lantukh, Demyan Vasilyevich. "Preliminary design of spacecraft trajectories for missions to outer planets and small bodies." Thesis, 2015. http://hdl.handle.net/2152/31341.

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Multiple gravity assist (MGA) spacecraft trajectories can be difficult to find, an intractable problem to solve completely. However, these trajectories have enormous benefits for missions to challenging destinations such as outer planets and primitive bodies. Techniques are presented to aid in solving this problem with a global search tool and additional investigation into one particular proximity operations option is discussed. Explore is a global grid-search MGA trajectory pathsolving tool. An efficient sequential tree search eliminates v∞ discontinuities and prunes trajectories. Performance

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30

Pauer, Martin. "Přímé a inverzní modelování topografie a gravitačního pole planet." Doctoral thesis, 2013. http://www.nusl.cz/ntk/nusl-327435.

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Title: Forward and Inverse Modeling of Planetary Gravity and Topography Author: Martin Pauer Department/Institute: Department of Geophysics MFF UK Supervisor of the doctoral thesis: Doc. RNDr. Ondřej Čadek, CSc., Department of Geophysics MFF UK Abstract: The aim of this work was to investigate various mechanisms compensating the observed planetary topography - crustal isostasy, elastic support and dynamic support caused by mantle flow. The investigated models were applied to three different planetary problems. Firstly we applied dynamic compensation model to explain today large-scale gravity a

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31

BROM, Jiří. "Matematické metody a úlohy v astronomii." Master's thesis, 2016. http://www.nusl.cz/ntk/nusl-202658.

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The aim of this thesis is to create collections of examples for the subject Astronomy taught for students of pedagogical faculties, studying this discipline as a part of physics courses. Due to very different mathematical knowledge of students I have chosen typical and not much difficult examples oriented to several branches of astronomy. Each part of examples begins with a self-contained theoretical introduction. The difficulty rises gradually from trivial to more complicated examples. The examples are mainly focused on motions in radial gravitational fields.

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