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  • 1
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    Multiple ground-based and satellite observations of global Pi 2 magnetic pulsations (1990)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Four Pi 2 events are examined using data obtained concurrently at the Syowa-Iceland conjugate stations, the EISCAT-Magnetometer Cross, low-latitude stations HER on the nightside and KAK on the dayside, and at AMPTE/CCE in the outer magnetosphere during the period from 2300 UT on May 22 to 0300 UT on May 23, 1985. Several characteristics of Pi 2 are established on the basis of high time resolution magnetic field data. First of all, horizontal components, H and D, of the Pi 2 oscillate nearly antiphase and in-phase, respectively, between the high- and low-altitude stations in the midnight southern hemisphere. Both H and D components of the Pi 2 have nearly in-phase relationships between the nightside and the dayside stations at low altitude. The Pi 2 amplitude is larger at the high-latitude station and decreases toward low latitudes. The dominant periods of the Pi 2 are nearly identical at all stations.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 95; 15175-15
    Format: text
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  • 2
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    Satellite observations of Pi 2 activity at synchronous orbit (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: An attempt is made to characterize Pi 2 activity at synchronous orbit, on the basis of magnetic field data recorded in September, 1974. Pi 2 bursts are primarily seen in the nighttime sector, probably near 2100 LT, and are usually simultaneous with the Pi 2 bursts seen at midlatitude ground stations. Three main event types are noted at the data-gathering satellite: a 100-sec irregular oscillation in all field components, an additional 100-sec irregular oscillation which, unlike the first, is not accompanied by high frequency oscillations, and a much rarer, quasi-sinusoidal oscillation in the east-west component of the field. The dominant period of Pi 2 bursts is about 100 sec, and tends to be shorter as the level of activity measured by field changes at the satellite increases.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 88; Sept. 1
    Format: text
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  • 3
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    Spectral characteristics of Pc 3 and Pc 4/5 magnetic pulsation bands observed near L = 6 (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The relationships among Pc 3, Pc 4, and Pc 5 activities observed at ground stations near L = 6 are clarified by comparing their dynamic spectral structures. It is found that there are two predominant spectral bands throughout the daytime with frequencies of about 20-80 mHz and about 3-10 mHz. At synchronous orbit, corresponding spectral bands are seen in the frequency-time spectra of the azimuthal component which generally show a clear harmonic structure when the satellite is located at the off-magnetic equator. The result strongly suggests that the 20-80 mHz band is the higher harmonics of standing shear Alfven waves and the 3-10 mHz band is the fundamental mode. Switching of activity between both bands is frequently observed on magnetically quiet days, indicating that the Pc 3 and Pc 4/5 bands are excited by different external driving sources.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 89; 9720-973
    Format: text
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  • 4
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    AMPTE/CCE observations of substorm-associated standing Alfven waves in the midnight sector (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Magnetic-field and medium-energy particle data from the AMPTE/CCE spacecraft are used to study substorm-associated ULF pulsations in the midnight sector at a radial distance of 8 to 9 earth radii. The particle data are used to identify ion injections and to detect the electric field of ULF waves. A case study of the events on May 23, 1985 shows that the waves have the properties of a fundamental-mode standing Alfven wave. It is suggested that these observations are evidence of substorm-associated standing Alfven waves in the nightside magnetosphere.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 15; 1287-129
    Format: text
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