• 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

    Inverse problem with continuous parameters for solar oscillations.

    • CSV
    • RefMan
    • EndNote
    • BibTex
    • RefWorks
    Thumbnail
    Name:
    azu_td_9303296_sip1_m.pdf
    Size:
    4.431Mb
    Format:
    PDF
    Description:
    azu_td_9303296_sip1_m.pdf
    Download
    Author
    Gu, Yeming
    Issue Date
    1992
    Keywords
    Dissertations, Academic.
    Astrophysics.
    Solar oscillations.
    Committee Chair
    Hill, Henry A.
    
    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.
    Abstract
    Solar seismology is a relatively new field in solar astrophysics. It provides us a way of "looking" into the deep interior of the Sun. The goal of solar seismology is to derive information about the internal structure of the Sun from the observed properties of solar oscillations. This is called the inverse problem of solar seismology. This project is to explore a new set of methods and algorithms to solve the inverse problem. The continuous orthonormalization (CON) method and the adjoint method adapted by Rosenwald can be used to compute the eigenfrequency sensitivities to the solar structure parameters in a very efficient way. In this work, the computational algorithm for using these methods has been modified and improved. Continuous parametrization for the internal structure of the Sun is introduced. The solar interior is subdivided into sections, and polynomial fits are applied to the solar structure parameters in each section. The eigenfrequency sensitivities to these polynomial coefficients--the continuous parameters--are computed. These sensitivities can be used to predict the change in solar eigenfrequencies when the structure parameters are perturbed (with the necessary physical constraints satisfied). The inverse problem for the solar internal structure is formulated by using these sensitivities. The generalized inverse technique is used to solve the nonlinear inverse problem in an iterative process. Observed data of low-degree g-modes have been used for a preliminary inversion. The nonlinearity of the solar seismic inverse problem is demonstrated. A nonlinear inversion process has been successfully performed and the results analysed. The inversion results indicate that the standard solar model is a good approximation of the real Sun. Only relatively small perturbations to the model are needed to explain the frequency deviations between observation and theory.
    Type
    text
    Dissertation-Reproduction (electronic)
    Degree Name
    Ph.D.
    Degree Level
    doctoral
    Degree Program
    Physics
    Graduate College
    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.