Дисертації з теми "Magnetospheric magnetic field"
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Schwarte, Judith. "Modelling the earth's magnetic field of magnetospheric origin from CHAMP data." [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=971057001.
Повний текст джерелаTopliss, Stephen Mark. "Particle features at the equatorward edge of the cusp." Thesis, University College London (University of London), 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.342233.
Повний текст джерелаPatra, Swadesh. "The Contribution of Magnetospheric Currents to Ground Magnetic Perturbation during Geomagnetic Storms." DigitalCommons@USU, 2013. https://digitalcommons.usu.edu/etd/1719.
Повний текст джерелаSchwarte, Judith [Verfasser]. "Modelling the earth's magnetic field of magnetospheric origin from CHAMP data / Geoforschungszentrum Potsdam. Von Judith Schwarte." Potsdam : Geoforschungszentrum, 2004. http://d-nb.info/971057001/34.
Повний текст джерелаWinslow, Reka Moldovan. "Investigation of Mercury's magnetospheric and surface magnetic fields." Thesis, University of British Columbia, 2014. http://hdl.handle.net/2429/50100.
Повний текст джерелаScience, Faculty of
Earth, Ocean and Atmospheric Sciences, Department of
Graduate
Eriksson, Stefan. "Global Magnetospheric Plasma Convection." Doctoral thesis, Stockholm : Tekniska högsk, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3230.
Повний текст джерелаStetler, Fredrik. "Isolated magnetic field structures in the Saturn magnetosphere." Thesis, KTH, Rymd- och plasmafysik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-214821.
Повний текст джерелаDenna rapports primära fokus är att använda data insamlad av Cassini satelliten ochanalysera dess magnetiska fältdata runt Saturnus. Genom att titta efter isolerade förändringari magnetiska fältvärdena går det att lokalisera och examinera potentiella plasmoider.Dessa så kallade plasmoider är fickor med högre densitet av plasma, associerademed en ökning eller minskning av magnetisk fältdata, inne i magnetoskiktet, vilket kanvara viktigt för interaktionen mellan solvindens plasma och magnetosfären. Studien hargjorts över 7 års tid, från början av 2010 till slutet av 2016. Under denna period harett antal magnetiska fältstrukturer hittats och dokumenterats i denna rapport, genom attanalysera några av deras egenskaper så som deras bredd och magnetisk fältstyrka.
Yuen, Rai. "Pulsar Magnetosphere Revisited: Emission Geometry and the Synthesis of the Vacuum-Dipole and the Rotating-Magnetosphere Models." Thesis, The University of Sydney, 2013. http://hdl.handle.net/2123/10011.
Повний текст джерелаBunting, Robert J. "Development and use of a current wedge modelling method for analysis of multiple onset substorms." Thesis, University of York, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.338555.
Повний текст джерелаDimmock, Andrew. "The study of magnetic and electric field structures at planetary magnetospheres." Thesis, University of Sheffield, 2012. http://etheses.whiterose.ac.uk/2679/.
Повний текст джерелаGralla, Samuel E., Alexandru Lupsasca, and Alexander Philippov. "PULSAR MAGNETOSPHERES: BEYOND THE FLAT SPACETIME DIPOLE." IOP PUBLISHING LTD, 2016. http://hdl.handle.net/10150/622675.
Повний текст джерелаSazykin, Stanislav. "Theoretical Studies of Penetration of Magnetospheric Electric Fields to the Ionosphere." DigitalCommons@USU, 2000. https://digitalcommons.usu.edu/etd/7152.
Повний текст джерелаGralla, Samuel E., Alexandru Lupsasca, and Alexander Philippov. "Inclined Pulsar Magnetospheres in General Relativity: Polar Caps for the Dipole, Quadrudipole, and Beyond." IOP PUBLISHING LTD, 2017. http://hdl.handle.net/10150/626414.
Повний текст джерелаShore, Robert Michael. "Improved description of Earth's external magnetic fields and their source regions using satellite data." Thesis, University of Edinburgh, 2013. http://hdl.handle.net/1842/8935.
Повний текст джерелаYapici, Tolga. "Influences Of Interplanetary Magnetic Field On The Variability Of Aerospace Media." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/3/12608784/index.pdf.
Повний текст джерелаHatch, Spencer Mark. "Stormtime and Interplanetary Magnetic Field Drivers of Wave and Particle Acceleration Processes in the Magnetosphere-Ionosphere Transition Region." Thesis, Dartmouth College, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10603779.
Повний текст джерелаThe magnetosphere-ionosphere (M-I) transition region is the several thousand--kilometer stretch between the cold, dense and variably resistive region of ionized atmospheric gases beginning tens of kilometers above the terrestrial surface, and the hot, tenuous, and conductive plasmas that interface with the solar wind at higher altitudes. The M-I transition region is therefore the site through which magnetospheric conditions, which are strongly susceptible to solar wind dynamics, are communicated to ionospheric plasmas, and vice versa. We systematically study the influence of geomagnetic storms on energy input, electron precipitation, and ion outflow in the M-I transition region, emphasizing the role of inertial Alfven waves both as a preferred mechanism for dynamic (instead of static) energy transfer and particle acceleration, and as a low-altitude manifestation of high-altitude interaction between the solar wind and the magnetosphere, as observed by the FAST satellite. Via superposed epoch analysis and high-latitude distributions derived as a function of storm phase, we show that storm main and recovery phase correspond to strong modulations of measures of Alfvenic activity in the vicinity of the cusp as well as premidnight. We demonstrate that storm main and recovery phases occur during ~30% of the four-year period studied, but together account for more than 65% of global Alfvenic energy deposition and electron precipitation, and more than 70% of the coincident ion outflow. We compare observed interplanetary magnetic field (IMF) control of inertial Alfven wave activity with Lyon-Fedder-Mobarry global MHD simulations predicting that southward IMF conditions lead to generation of Alfvenic power in the magnetotail, and that duskward IMF conditions lead to enhanced prenoon Alfvenic power in the Northern Hemisphere. Observed and predicted prenoon Alfvenic power enhancements contrast with direct-entry precipitation, which is instead enhanced postnoon. This situation reverses under dawnward IMF. Despite clear observational and simulated signatures of dayside Alfvenic power, the generation mechanism remains unclear. Last, we present premidnight FAST observations of accelerated precipitation that is best described by a kappa distribution, signaling a nonthermal source population. We examine the implications for the commonly used Knight Relation.
Kullen, Anita. "Polar auroral arcs." Doctoral thesis, KTH, Alfvén Laboratory, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3562.
Повний текст джерелаLotz, Stefanus Ignatius. "Empirical modelling of the solar wind influence on Pc3 pulsation activity." Thesis, Rhodes University, 2012. http://hdl.handle.net/10962/d1005249.
Повний текст джерелаCaudal, Gérard. "Sur la facon dont le plasma piege a l'interieur des magnetospheres planetaires deforme le champ electrique et le champ magnetique qui y regnent." Paris 7, 1987. http://www.theses.fr/1987PA077101.
Повний текст джерелаHill, Meirian Jane. "The microwave palaeointensity technique and its application to lava." Thesis, University of Liverpool, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367068.
Повний текст джерелаUwamahoro, Jean. "An analysis of sources and predictability of geomagnetic storms." Thesis, Rhodes University, 2011. http://hdl.handle.net/10962/d1005236.
Повний текст джерелаLeto, P., Courtney Trigilio, Lidia M. Oskinova, Richard Ignace, C. S. Buemi, G. Umana, A. Ingallinera, et al. "A Combined Multiwavelength VLA/ALMA/Chandra Study Unveils the Complex Magnetosphere of the B-Type Star HR5907." Digital Commons @ East Tennessee State University, 2018. https://dc.etsu.edu/etsu-works/2682.
Повний текст джерелаLoridan, Vivien. "Physical and numerical modeling of the dynamics of high-energy electrons trapped in the outer radiation belt of the Earth’s magnetosphere." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLN043/document.
Повний текст джерелаSatellites are vulnerable to high-energy particles trapped in the Van Allen belts. To ensure their protection, it is necessary to predict properly the electron dynamics in the magnetosphere. We first propose an original method to find the analytical solution of the reduced Fokker-Planck equation that models the transport and loss of electrons in the inner magnetosphere. The resolution relies on an eigenfunction expansion approach. If the analytical solution is proven to be useful at uncovering some of the physical properties of the radiation belts, it is also relevant to validate the numerical code that solves the reduced Fokker-Planck equation, which has been developed during the PhD. The latter code is used to generalize the previous study in illustrating the evolution of the electron fluxes for various energies and locations. We demonstrate that the structure of the radiation belts as well as their dynamical timescales only depend on a few well-chosen parameters. In the perspective of reproducing a specific storm-recovery event reported by the NASA Van Allen Probes, we are able to simulate the electron scattering in the Earth’s atmosphere due to the interaction with magnetospheric electromagnetic waves. The consideration of data-driven and event-specific conditions enables us to corroborate the observed fluxes. Finally, various influences of the Earth’s magnetic field on the dynamics of the radiation belts are investigated. We focus on the outer belt to see how the magnetic field asymmetries, which are strongly shaped by solar activity, affect the way of conciliating theory and observations. We also explore the importance of new hidden diffusive processes that emerge due to the natural irregularity of the magnetic field in the closest vicinity of the Earth
Yalim, Mehmet S. "An artificial compressibility analogy approach for compressible ideal MHD: application to space weather simulation." Doctoral thesis, Universite Libre de Bruxelles, 2008. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210427.
Повний текст джерелаablacdotvec{B} = 0$). The simulations become unstable unless specific measures have been taken.
In this thesis, a solenoidal constraint satisfying technique that allows discrete satisfaction of the solenoidal constraint up to the machine accuracy is presented and validated with a variety of test cases. Due to its inspiration from Chorin's artificial compressibility method developed for incompressible CFD applications, the technique was named as \
Doctorat en Sciences de l'ingénieur
info:eu-repo/semantics/nonPublished
André, Philippe. "Emission radio des etoiles pre-sequence principale du nuage rho ophiuchi : observations et interpretations." Paris 6, 1987. http://www.theses.fr/1987PA066240.
Повний текст джерелаHilmer, Robert Vincent. "A magnetospheric magnetic field model with flexible internal current systems." Thesis, 1989. http://hdl.handle.net/1911/16240.
Повний текст джерелаNaehr, Stephen M. "Quantitative modeling of time-dependent phenomena in the magnetospheric magnetic field." Thesis, 2002. http://hdl.handle.net/1911/18118.
Повний текст джерелаWaters, Colin L. "Low latitude geomagnetic field line resonance." Thesis, 1992. http://hdl.handle.net/1959.13/1416267.
Повний текст джерелаIn the past many attempts have been made to use geomagnetic pulsations for diagnostic studies of the magnetospheric plasma. These techniques have often involved the observation of Alfvén wave magnetic field line resonances which can be detected as geomagnetic pulsations in space and on the ground. Previous ground based measurements of these resonant wave structures have required large magnetometer arrays and detailed analysis of wave polarisation. The spectral difference in wave amplitude and phase between two closely spaced magnetometer sites is shown to be capable of identifying this resonant structure. A technique based on the cross spectral phase is described and shown to be particularly suitable for monitoring temporal variations in field line and plasma characteristics. Geomagnetic pulsation data at L=1.8 and L=2.8 show that resonance structure is present on most days and occurs during all daytime hours. The structure at L= 1.8 shows a single resonant frequency while at L=2.8 up to 4 harmonics are seen, depending on geomagnetic conditions. Data recorded for 4 months between July and October, 1989 at L=1.8 showed a day-to-day variation in the resonant frequency between 38-56 mHz with the most common frequency between 44-45 mHz occuring on 30 of the 138 samples. A distinguishing feature at L=1.8 is a local morning decrease in the resonant frequency commencing at sunrise and lasting approximately 3 hours. The diurnal variation in geomagnetic field line eigenfrequency at both L = 1.8 and L=2.8 on two consecutive days that exhibited different temporal variation has been modelled by solving the hydromagnetic wave equation for the Alfvén wave mode using a dipole magnetic field and the IRI-90 ionospheric and diffusive equilibrium (DE) plasma density models. These calculations failed to predict the observed harmonic spacing at L=2.8 with the eigenfrequencies found to be lower by more than 50% compared to the experimental values at both L=1.8 and 2.8. However, the importance of mass loading due to 0⁺ at ionospheric altitudes in determining the harmonic spacing is demonstrated. Helium was found to be unimportant in this regard. A comparison of eigenfrequencies calculated for L= 1.7 and 2.4 using the plasma density model of Bailey (1983) and those for the IRI-DE model show the model of Bailey (1983) used by Poulter et al. (1984a, b, 1988) is more realistic for these latitudes. A time domain phase analysis technique, similar in principle to the operation of a phase-locked loop, has been developed to study rapid phase changes in geomagnetic pulsation wave trains. The resulting phase-time representation shows the demodulated input signal and provides wave group structure information. A study of the pulsation group structure using a magnetometer array in eastern Australia spanning 300520 geomagnetic latitude (L=1.4-2.8) and 2.2 hours in longitude is presented. It is shown that the observation of phase skips in pulsation records do not necessarily imply an impulsive source. The phase-time characteristics of signals at three frequencies are compared across the array. Two waves (40 and 43 mHz) show similar characteristics across the latitudinal extent of the array while the other (34 mHz) shows evidence of geomagnetic field line resonance around L∼2. An examination of the pulsation phase-time representation with latitude across this array shows a low latitude region below L∼2 where the spectra at all stations exhibit a similar shape with decreasing power as the latitude decreases. The phase-time characteristics do not show evidence of a broadband wave energy source as the excitation mechanism of low latitude field line resonances. An analysis of phase skip propagation speeds also shows that the assumption of plane wave type propagation is an over simplification. Consequently geomagnetic pulsation activity was modelled by frequency modulating the driving frequency of a forced, lightly damped simple harmonic oscillator. Best agreement with the observed phase-time characteristics was obtained with the driving frequency modulated at 8 mHz and centred on a resonant frequency at 50 mHz.
Ding, Cheng. "Mapping magnetic flux tubes and field aligned currents using two representative magnetospheric models." Thesis, 1993. http://hdl.handle.net/1911/13714.
Повний текст джерелаSchwarte, Judith [Verfasser]. "Modelling the earth's magnetic field of magnetospheric origin from CHAMP data / von Judith Schwarte." 2004. http://nbn-resolving.de/urn:nbn:de:gbv:084-5650.
Повний текст джерела"Modelling the Geometric Structure of the Magnetic Field in the Nightside Magnetosphere." Thesis, 2013. http://hdl.handle.net/10388/ETD-2013-03-1448.
Повний текст джерела"Magnetic field line connection between the ionosphere and the magnetosphere -Auroral activity and relevant magnetic field variations at geosynchronous orbit-." Thesis, 1992. http://hdl.handle.net/2237/6624.
Повний текст джерелаNishitani, Nozomu, and 望. 西谷. "Magnetic field line connection between the ionosphere and the magnetosphere -Auroral activity and relevant magnetic field variations at geosynchronous orbit-." Thesis, 1992. http://hdl.handle.net/2237/6624.
Повний текст джерелаFu, Wei-Tsung, and 傅瑋宗. "Interplanetary Magnetic Field (IMF) Control over the Global Structures of Laboratory Magnetosphere." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/94brun.
Повний текст джерела國立中央大學
太空科學研究所
107
Both east - west and north - south view images of magnetosphere for various interplanetary magnetic field (IMF) parameters have been investigated simultaneously in a laboratory experiment of the solar wind - magnetosphere coupling. An aurora is observed for both case of southward and northward IMF but the luminosity becomes stronger for southward IMF. Also, the reconnections are investigated in the front and tail areas. Inserting the 20 - degree terrella tilt, the study of modeling analysis is also processed for comparison with photograph of the experimental results in the laboratory simulation. Applied the models on CCMC overview of the global structure, the comparisons of model and laboratory simulation show the curvatures of the magnetic lines are qualitatively matched for the un-tilted and tilted terrella.
HILMER, ROBERT V. "A MAGNETO-HYDROSTATIC MODEL OF MAGNETIC FIELD ROTATION THROUGH THE GEOMAGNETIC TAIL (MAGNETOSPHERE, IMF)." Thesis, 1986. http://hdl.handle.net/1911/13166.
Повний текст джерела