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  • 1
    Electronic Resource
    Electronic Resource
    Polarization Characteristics of Individual Elements in a PC 1 Micropulsation Event (1969)
    [s.l.] : Nature Publishing Group
    Nature 224 (1969), S. 895-897 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In this article we call attention to the polarization characteristics along particular frequency-time elements ("fine-structures"2) in a PC 1 event. The sonogram (Fig. 2) shows the event to be a normal periodically structured PC 1 event except for two conspicuous elements which extend up to higher ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/224895c0
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Pi 1–2 magnetic field pulsations on dayside cleft field lines (1977)
    [s.l.] : Nature Publishing Group
    Nature 269 (1977), S. 313-314 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A direct comparison between Pi 1-2 activity as observed at Bar I (70.3N, 257E, geom.) and College (64.7N, 257E) on 26-27 July 1969, and observations of the dayside cleft by satellite3 is shown in Fig. 1. In the interval 2000-0100 UT, which is local midday at Bar I and College, the cleft moved ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/269313a0
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  • 3
    Electronic Resource
    Electronic Resource
    Variations in PC I Frequency with Latitude (1968)
    [s.l.] : Nature Publishing Group
    Nature 217 (1968), S. 153-155 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig.1 Sonagram showing very high frequency structured PC 1 evert, Nurmijaarvi, Finland. June 7, 1967. Table 1. AVERAGE PC 1 FREQUENCIES (HZ) OF THE HALF-HOURLY OCCURRENCES IN 1967 January May June Nurmijaarvi Sodankyla College 1-32 0-72 2-39 0-79 0-74 1-95 0-96 0-57 There is considerable ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/217153a0
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  • 4
    Electronic Resource
    Electronic Resource
    Type Pi 1–2 magnetic field pulsations (1981)
    Springer
    Space science reviews 28 (1981), S. 191-221 
    Details
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The relationships of type Pi (broadband) pulsations to various other substorm-related phenomena are reviewed. Several of the more popular mechanisms for the origin of Pi activity are discussed in the light of the observations. There is only one mechanism in sight that tentatively accounts for observed characteristics of Pi 1–2 activity at auroral oval and polar cap latitudes and that is the three-dimensional current loop mechanism. If two or more mechanisms are involved in the generation of Pi noise, then it is possible that the garden-hose overstability and/or a drift Alfvén wave mechanism operating in the plasma sheet contribute to the observed pulsations. The common feature of all Pi 1–2 events is not the presence of temporal precipitation pulsations but the presence of an E-region, suggesting that enhanced conductivity and E-region currents are required. Pi activity appears to be closely related to unsteady convection in progress. Pi data promise to provide useful information on convection and field-aligned and ionospheric currents.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00218811
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