Thesis (Ph. D.)--University of Adelaide, Dept. of Classics, 1989? / Vol. 2. consists of 64 leaves of mounted photographs. Plate 1 is Plan of I 11, 6-7, by Barry Rowney of Dept. of Architecture, University of Adelaide. Includes bibliographical references (leaves 276-291).

Vol. 2. consists of 64 leaves of mounted photographs / Plate 1 is Plan of I 11, 6-7, by Barry Rowney of Dept. of Architecture, University of Adelaide / Bibliography: leaves 276-291 / 2 v. (291 leaves, [64] leaves of plates) : ill., plan ; 31 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.)--University of Adelaide, Dept. of Classics, 1989?

Venus does not have a strong intrinsic magnetic field as the Earth, and its magnetosphere is induced by the interaction of the solar wind with the ionosphere. The near-Venus space environment is characterized by the presence of a bow shock and of an induced magnetic boundary linked to the interplanetary magnetic field orientation. The interaction of the solar wind with the planetary atmosphere and exosphere is more direct than on Earth. This interaction energises ionospheric ions, leading to a loss of atmospheric compounds in space. Ions and energetic neutral atoms of solar wind or of planetary origin can precipitate onto the upper atmosphere of Venus, which is an important process of mass, momentum and energy transfer, and can lead to an increase of the loss of planetary constituents due to the atmospheric sputtering. The energetic neutral atoms are used as a diagnostic method, that gives a continuous and global imaging of the planetary magnetosphere. They are generated by multiple processes, as charge exchange, scattering and sputtering from the upper atmosphere of Venus. In this work, we study the precipitation of oxygen and hydrogen ions and energetic neutrals in the upper atmosphere of Venus. We use data produced with a global hybrid plasma model that simulated the interaction between Venus and the solar wind, and simulate the charge exchange process between the energetic ions and exospheric neutral particles to produce the energetic neutral atoms. Due to the low North-South asymmetry in the precipitation of oxygen planetary ions and energetic neutral atoms, we conclude that the effect of the finite gyroradius of oxygen ions is limited. Compared to the case of Mars, the fraction of the solar wind that precipitates as hydrogen energetic neutral atoms onto Venus is lower, consistently with the less extended exosphere of Venus. / Venus har inte ett starkt internt magnetfält som jorden, och dess magnetosfär induceras av solvindens växelverkan med jonosfären. Rymdmiljön nära Venus kännetecknas av närvaron av en bogchock och av en inducerad magnetisk gräns kopplad till den interplanetära magnetfältsorienteringen, genom en mer direkt växelverkan mellan solvinden och planetens exosfären och atmosfär än på jorden. Denna växelverkan aktiverar jonosfäriska joner, vilket leder till en förlust av atmosfär till rymden. Joner och energiska neutrala atomer i solvind eller av planetärt ursprung kankollidera med den övre atmosfären på Venus. Detta är en viktig typ av överföring av massa, rörelsemängd och energi och kan leda till en ökning av förlusten av planetära beståndsdelar på grund av sputtering. De energiska neutrala atomerna används som en diagnostisk metod, vilket ger en kontinuerlig och global avbildning av Venus magnetosfär. De är genererade av flera processer, som laddningsutbyte, spridning och sputtering från Venus övre atmosfär. I det här arbetet studerar vi precipitering av syre- och vätejoner och energiska neutraler i den övre atmosfären på Venus. Vi använder data som produceras med en global hybridplasmamodell som simulerar växelverkan mellan Venus och solvinden, och laddningsutbytesprocessen mellan de energiska jonerna och exosfäriska neutralpartiklar för att producera energiska neutrala atomer. På grund av den låga nord-sydliga asymmetrin i precipiteringen av planetära syrejoner och energiska neutrala atomer, drar vi slutsatsen att effekten av syrejonernas ändliga gyroradius är begränsad. Vi jämför precipitering väte och energiska neutralpartiklar på Venus med fallet på Mars. / A differenza della Terra, Venere non possiede un campo magnetico intrinseco. L’interazione del vento solare con la ionosfera del pianeta forma quella che è chiamata magnetosfera indotta. Questa struttura presenta un bow shock e un induced magnetic boundary (confine magnetico indotto) ed è fortemente legata all’orientamento del campo magnetico interplanetario. L’interazione tra il vento solare e l’atmosfera di Venere è più diretta in confronto a quanto accade per la Terra. Questa interazione è capace di energizzare ioni della ionosfera oltre alla loro velocità di fuga, portando a una perdita nello spazio di materiale di origine planetaria. Ioni o atomi neutri del vento solare o di origine planetaria possono precipitare nell’atmosfera del pianeta, trasferendo in questo modo energia, quantità di moto e massa dallo spazio a Venere. La precipitazione di ioni e atomi neutri può causare lo sputtering di materiale planetario e causare in questo modo un aumento della perdita di materia dall’atmosfera del pianeta. Gli atomi neutri energetici sono utilizzati come metodo di indagine per la magnetosfera, di cui possono fornire una rappresentazione globale e continua. Gli atomi neutri energetici sono generati da sputtering, backscattering e da processi di trasferimento di carica. In questa tesi è studiata la precipitazione nell’atmosfera di Venere di ioni e di atomi neutri, sia di idrogeno che di ossigeno. Sono utilizzati dati prodotti con un modello ibrido che simula l’interazione tra Venere e il vento solare. Gli atomi neutri energetici sono prodotti modellando il meccanismo di scambio di carica tra gli ioni e l’esosfera neutra di Venere. Si conclude che l’assimmetria calcolata nella precipitazione degli ioni di ossigeno è più bassa di quanto ci si sarebbe aspettato. La precipitazione di atomi neutri di idrogeno nell’atmosfera di Venere è confrontata con il caso di Marte.

Darstellungen der Planeten und ihrer Kinder gehörten zu den ersten paganen Bildern, die im Spätmittelalter produziert und rezipiert wurden. Während der rund 200 Jahre ihres hauptsächlichen Auftretens, bis zum Ende des 16. Jahrhunderts, erreichten sie eine enorme Popularität. Im Weltbild des Mittelalters und der frühen Neuzeit war jeder Mensch von dem Gestirn geprägt, unter dessen Einfluss er geboren wurde. Dieser Planet bestimmte, wie man körperlich und charakterlich beschaffen war, welchen Beruf man ausübte und welche gesellschaftliche Stellung man erwarten durfte. Der Geburtsmoment sorgte für eine lebenslange, familiäre Verbindung zum Gestirn, man wurde quasi zu dessen Kind. Die Macht der Sterne zeichnet die Entwicklung von der ersten Erwähnung der Planetenkinder in Schriftquellen, über die Herausbildung eines relativ stabilen ikonografischen Kanons in verschiedenen Medien, funktionsgebundene Variationen bis zum Aufgehen in anderen Bildgattungen nach. Die zumeist siebenteiligen Zyklen stellen sich als Teil eines weit ausgebauten Beziehungsgefüges und Verweissystems dar, in dem sich das jeweilige gesellschaftliche Bild der Zeit spiegelt. Die Darstellungen dokumentieren zudem zentrale Entwicklungen des individuellen Denkens bis zum Ende des 16. Jahrhunderts. Sie zeigen, wie das jeweils aktuelle kosmologische Verständnis und Wissen einem breiten Publikum durch Bilder vermittelt werden konnte, wie dies mit dem religiösen Leben vereinbar war oder sich im Alltag niederschlug. Planetenkinder-Darstellungen hatten im Verlauf ihrer Geschichte vielfältige Funktionen. In ihnen manifestierte sich die Vorstellung einer Einheit der Dinge in zahlreichen Analogien. Gezielt eingesetzt wurden die Bilder zur Markierung sozialer Aufstiege, politischer Interessen und der Reklamation von Machtansprüchen sowie der Repräsentation von Einfluss bzw. Verherrlichung von Auftraggebern. Die Bilder zeigen philosophische Diskurse auf, verweisen auf konkrete historische Ereignisse und bewerten diese. / Representations of the planets and their children were among the first pagan images to be produced and adopted in the late Middle Ages. During the circa 200 years in which they mainly appeared, up until the end of the sixteenth century, they became enormously popular. In the worldview of the Middle Ages and early modern era, every person was believed to be influenced by the celestial body under whose influence they were born. This planet determined one’s physical appearance and character, one’s profession, and the social standing one could expect. The moment of birth ensured the continuation of a life-long, familiar connection to this celestial body, and a person was effectively considered its “child”. Die Macht der Sterne traces these developments from the first written references to the children of the planets, through to the emergence of a relatively stable iconographical canon in various media, variations in terms of function, as well as their appearance in other pictorial genres. These cycles, usually consisting of seven parts, presented themselves as part of a highly elaborate relational structure and system of references which reflected the current social worldview. The images also document key developments in individual thought up until the end of the sixteenth century. They show how the prevailing understanding of the cosmos and knowledge could be communicated to a wide audience by means of imagery, how this was reconciled with religious life, and how it was reflected in everyday life. Over the course of their history, images of the children of the planets served a variety of functions. By means of a number of analogies they illustrated the notion of the unity of all things. These images were also consciously employed to underscore social advancement, political interests, and the reassertion of claims to power as well as representations of influence or the glorification of patrons. These depictions also highlight philosophical discourses and refer to concrete historical events while offering evaluations of these phenomena.