• Login
    View Item 
    •   Home
    • UA Graduate and Undergraduate Research
    • UA Theses and Dissertations
    • Dissertations
    • View Item
    •   Home
    • UA Graduate and Undergraduate Research
    • UA Theses and Dissertations
    • Dissertations
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Browse

    All of UA Campus RepositoryCommunitiesTitleAuthorsIssue DateSubmit DateSubjectsPublisherJournalThis CollectionTitleAuthorsIssue DateSubmit DateSubjectsPublisherJournal

    My Account

    LoginRegister

    About

    AboutUA Faculty PublicationsUA DissertationsUA Master's ThesesUA Honors ThesesUA PressUA YearbooksUA CatalogsUA Libraries

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular Authors

    Charged-Particle Transport in Turbulent Magnetic Fields

    • CSV
    • RefMan
    • EndNote
    • BibTex
    • RefWorks
    Thumbnail
    Name:
    azu_etd_14965_sip1_m.pdf
    Size:
    2.145Mb
    Format:
    PDF
    Download
    Author
    Sun, Peng
    Issue Date
    2016
    Keywords
    Non-Isotropy
    Transport
    Turbulence
    Planetary Sciences
    Charged Particle
    Advisor
    Jokipii, Jack Randy
    ο»Ώ
    Metadata
    Show full item record
    Publisher
    The University of Arizona.
    Rights
    Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
    Embargo
    Release after 07-Sep-2017
    Abstract
    Collisionless turbulence is common in astrophysical magnetic fields and plasmas. The determination of the transport of high-energy charged particles both parallel and perpendicular to the average magnetic field in such a system is of considerable interest. It is recognized that the turbulent magnetic field has important effects on the transport of charged particles and that the properties of different turbulence models may significantly affect the resulting transport properties. A number of different magnetic turbulence models have been proposed in the last several decades. We present here the results of a study of charged particle transport in two new turbulent magnetic field models that have not been previously considered and include newly described characteristics. We investigate the effect of energetic charged particle motion in these new models. We use a method (D A Roberts, 2012) that optimizes phase angles of a set of circularly polarized, transverse modes with Kolmogorov power-law enveloped amplitudes to construct magnetic field fluctuations with nearly constant |B| but with large variances in the components Bx, By, Bz, as is observed in the Solar Wind. Charged particle scattering coefficients are determined through computer simulations. The results are compared with those from previous isotropic and composite turbulence models. We studied charged particle transport in the turbulent magnetic field with global anisotropy and compared with the isotropic turbulence. We found that the magnetic turbulence with global anisotropy and isotropy have similar effects on charged particle transport from 1𝑀𝑒𝑉 up to 10𝐺𝑒𝑉. We proposed a general framework for a multi-scale synthesis with the scale- dependent, localized anisotropic feature incorporated. We run test particle simula- tions in the field by the two-scale algorithm to calculate the transport coefficients for charged particles with different energies. We found that the local anisotropy has the significant difference from the previous model in the effect on charged particle transport. The parallel transport (𝑘βˆ₯) decreases while the perpendicular transport (𝑘⊥) increases compared with the isotropic and globally anisotropic field models, the difference is enhanced as the local anisotropy is enhanced, and there is an order of magnitude increase in the ratio of perpendicular to parallel transport coefficients. We proposed a simple power spectrum synthesis method based on the Fourier analysis to extract the large and small scale power spectrum from any single space- craft observation with a long enough period and a high sampling frequency. We applied the method to the solar wind measurement by the magnetometer onboard the ACE spacecraft and reconstructed the large scale isotropic 2D spectrum and the small scale anisotropic 2D spectrum.
    Type
    text
    Electronic Dissertation
    Degree Name
    Ph.D.
    Degree Level
    doctoral
    Degree Program
    Graduate College
    Planetary Sciences
    Degree Grantor
    University of Arizona
    Collections
    Dissertations

    entitlement

     
    The University of Arizona Libraries | 1510 E. University Blvd. | Tucson, AZ 85721-0055
    Tel 520-621-6442 | repository@u.library.arizona.edu
    DSpace software copyright © 2002-2017  DuraSpace
    Quick Guide | Contact Us | Send Feedback
    Open Repository is a service operated by 
    Atmire NV
     

    Export search results

    The export option will allow you to export the current search results of the entered query to a file. Different formats are available for download. To export the items, click on the button corresponding with the preferred download format.

    By default, clicking on the export buttons will result in a download of the allowed maximum amount of items.

    To select a subset of the search results, click "Selective Export" button and make a selection of the items you want to export. The amount of items that can be exported at once is similarly restricted as the full export.

    After making a selection, click one of the export format buttons. The amount of items that will be exported is indicated in the bubble next to export format.