• Login
    View Item 
    •   Home
    • University of Alaska Fairbanks
    • UAF Graduate School
    • Older Theses Not Clearly Affiliated with a Current College
    • View Item
    •   Home
    • University of Alaska Fairbanks
    • UAF Graduate School
    • Older Theses Not Clearly Affiliated with a Current College
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Browse

    All of Scholarworks@UACommunitiesPublication DateAuthorsTitlesSubjectsTypeThis CollectionPublication DateAuthorsTitlesSubjectsType

    My Account

    Login

    First Time Submitters, Register Here

    Register

    Statistics

    Display statistics

    Electric Conductivities, Currents And Energy Dissipation In The Polar Ionosphere

    • CSV
    • RefMan
    • EndNote
    • BibTex
    • RefWorks
    Thumbnail
    Name:
    Ahn_B_1983.pdf
    Size:
    3.765Mb
    Format:
    PDF
    Download
    Author
    Ahn, Byung-Ho
    Keyword
    Physics, Atmospheric Science
    Metadata
    Show full item record
    URI
    http://hdl.handle.net/11122/9271
    Abstract
    During the International Magnetospheric Study (IMS), magnetic records from the six IMS meridian chain stations were obtained on March 17, 18 and 19, 1978. The data set is one of the most comprehensive ever obtained. Furthermore, several advanced computer codes calculating ionospheric current distributions based on the ground magnetic data were recently introduced. Combining the data set and the computer code developed by Kamide et al. (1981), it is attempted to re-examine the longstanding uncertainties in the current distributions and the energy dissipation rates in the polar ionosphere during substorms. For this purpose, a conductivity model which can reflect substorm conditions on an instantaneous basis was obtained based on the empirical relations of the north-south component ((DELTA)H) of the magnetic disturbance field observed at College, with the Pedersen and Hall conductivities deduced from Chatanika radar observations. In addition, the relationship of the particle energy injection rate, estimated from the radar, to (DELTA)H is also established. Based on the conductivity model thus obtained and the computer code, the ionospheric current distributions of 5-minute time resolution are obtained. Several interesting features in the current distributions during each phase of substorm are discussed. Furthermore, a new ionospheric current model during a substorm is schematically suggested. The IMF effects on the current patterns are also discussed. For several events, the roles of the ionospheric Pedersen and Hall currents are examined separately. By constructing the hourly distribution map of the Joule heat production rate, the particle energy injection rate and their sum over the entire polar region, it is possible to estimate the global Joule heat production rate, the global particle energy injection rate and the sum of the two quantities. It is found that the three global quantities are related almost linearly to the AE and AL indices.
    Description
    Dissertation (Ph.D.) University of Alaska Fairbanks, 1983
    Date
    1983
    Type
    Dissertation
    Collections
    Older Theses Not Clearly Affiliated with a Current College
    Theses (Unassigned)

    entitlement

     
    ABOUT US|HELP|BROWSE|ADVANCED SEARCH

    The University of Alaska Fairbanks is an affirmative action/equal opportunity employer and educational institution and is a part of the University of Alaska system.

    ©UAF 2013 - 2023 | Questions? ua-scholarworks@alaska.edu | Last modified: September 25, 2019

    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.