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  • 1
    Series available for loan
    Series available for loan
    Washington, DC : United States Gov. Print. Off.
    Associated volumes
    Call number: SR 90.0003(1109)
    In: U.S. Geological Survey circular
    Type of Medium: Series available for loan
    Pages: IV, 31 S.
    Series Statement: U.S. Geological Survey circular 1109
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 2
    Monograph available for loan
    Monograph available for loan
    Cambridge : Cambridge Univ. Press
    Call number: M 98.0080 ; 5/M 02.0050
    Type of Medium: Monograph available for loan
    Pages: 290 S.
    Edition: 1st publ.
    ISBN: 0521571936
    Classification:
    Geomagnetism, Geoelectromagnetism
    Language: English
    Location: Upper compact magazine
    Location: Reading room
    Branch Library: GFZ Library
    Branch Library: GFZ Library
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  • 3
    Monograph available for loan
    Monograph available for loan
    Basel [u.a.] : Birkhäuser
    Call number: M 97.0289
    Type of Medium: Monograph available for loan
    Pages: S. 315-549
    Edition: Reprint
    ISBN: 3764323388
    Classification:
    Geomagnetism, Geoelectromagnetism
    Language: English
    Location: Upper compact magazine
    Branch Library: GFZ Library
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  • 4
    Monograph available for loan
    Monograph available for loan
    London [u.a.] : Academic Press
    Call number: AWI G8-01-0179b ; AWI G8-01-0179a
    Type of Medium: Monograph available for loan
    Pages: XVII 1398 S. : graph. Darst.
    Series Statement: International geophysics series 11
    Branch Library: AWI Library
    Branch Library: AWI Library
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  • 5
    Unknown
    Basel, Boston, Berlin : Birkhäuser
    Pages: Online-Ressource (305 Seiten)
    ISBN: 9783034873734
    Language: English
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  • 6
    Unknown
    Basel, Boston, Berlin : Birkhäuser
    Keywords: quiet daily geomagnetic field variations ; lunar variations ; ionospheric dynamo currents ; thermotidal currents
    Pages: Online-Ressource (235 Seiten)
    ISBN: 9783764323387
    Language: English
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 125 (1987), S. 193-204 
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 116 (1978), S. 1143-1173 
    ISSN: 1420-9136
    Keywords: Alaska pipeline ; Auroral currents ; Induction currents ; Magnetotelluric fields ; Corrosion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The Alaskar pipeline is a highly conducting anomaly extending 800 miles (1300 km) from about 62° to 69° geomagnetic latitude beneath the most active regions of the ionospheric electrojet current. The spectral behavior of the magnetic field from this current was analyzed using data from standard geomagnetic observatories to establish the predictable patterns of temporal and spatial changes for field pulsation periods between 5 min and 4 hr. Such behavior is presented in a series of tables, graphs and formulae. Using 2- and 3-layer models of the conducting earth, the induced electric fields associated with the geomagnetic changes were established. From the direct relationship of the current to the geomagnetic field variation patterns one can infer counterpart temporal and spatial characteristics of the pipeline current. The relationship of the field amplitudes to geomagnetic activity indices,A p, and the established occurrence of various levels ofA p over several solar cycles were employed to show that about half of the time the induced currents in the pipe would be under 1 A for the maximum response oscillatory periods near 1 hr. Such currents should be of minimal consequence in corrosion effects for even a section of the pipeline unprotected by sacrificial electrodes. Of greater interest was the result that the extreme surges of current should reach over one-hundred amperes in the pipeline during high activity.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 131 (1989), S. 315-331 
    ISSN: 1420-9136
    Keywords: Quiet daily geomagnetic field variations ; Sq ; L ; lunar variations ; ionospheric dynamo currents ; thermotidal currents
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract On days that are quiet with respect to solar-terrestrial activity phenomena, the geomagnetic field has variations, tens of gamma in size, with major spectral components at about 24, 12, 8, and 6 hr in period. These quiet daily field variations are primarily due to the dynamo currents flowing in theE region of the earth's ionosphere, are driven by the global thermotidal wind systems, and are dependent upon the local tensor conductivity and main geomagnetic field vector. The highlights of the behavior and interpretation of these quiet field changes, from their discovery in 1634 until the present, are discussed as an introduction to the special journal issue on Quiet Daily Geomagnetic Fields.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 125 (1987), S. 427-457 
    ISSN: 1420-9136
    Keywords: Electric conductivity ; upper mantle ; Sq ; geomagnetic daily variations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The electrical conductivity of the Earth's upper mantle can be inferred from geomagnetic quiet-day,Sq, variations recorded at the world's observatories using the, coefficients of a spherical harmonic analysis (SHA) that separate the external (source) and internal (induced) parts of the surface field. The conductivity profile determined from such an analysis can be sensitive to special characteristics of the quiet field itself as well as the separation techniques employed. This review of the Sq-analysis features critical to a conductivity derivation is pictorially presented along with the equations for application of theSchmucker (1970) technique to theSHA coefficients for a conductivity determination. Three examples illustrate the use of these equations with differentSq models.
    Type of Medium: Electronic Resource
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