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  • 1
    Electronic Resource
    Electronic Resource
    A slow mode wave as a possible source of Pi 2 and associated particle precipitation: a case study (1999)
    Springer
    Annales geophysicae 17 (1999), S. 674-681 
    Details
    ISSN: 0992-7689
    Keywords: Magnetospheric physics (auroral phenomena; energetic particles, precipitating; MHD waves and instabilities)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract An intensification of auroral luminosity referred to as an auroral break-up often accompanies the onset of geomagnetic pulsation (Pi 2) at the dip-equator. One such auroral break-up occurred at 2239 UT on 16 June, 1986, being accompanied by weak substorm activity (AE≈50 nT) which was recorded in all-sky image of Syowa Station, Antarctica (66.2°S, 71.8°E in geomagnetic coordinates). The associated Pi 2 magnetic pulsation was detected by a fluxgate magnetometer in the afternoon sector at the dip-equator (Huancayo, Peru; 1.44°N, 355.9° in geomagnetic coordinates; 12.1°S, 75.2°W in geographic coordinates; L = 1.00). In spite of the large separation of the two stations in longitude and latitude, the auroral break-up and subsequent luminosity modulation were seen to be correlated with the wave form of the ground Pi 2 pulsation. This occurred in such a way that the luminosity maximum was seen to occur at the phase of maximum amplitudes of Pi 2 wave form. We argue that the observed correlation could be interpreted as indicating a Pi 2-modulation of a field-aligned acceleration of the low energy electrons that may occur near the equator of the midnight magnetosphere.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00585-999-0674-4
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A determination of the hydromagnetic waves polarization from their perturbations on the terminator (1996)
    Springer
    Annales geophysicae 14 (1996), S. 647-658 
    Details
    ISSN: 0992-7689
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The influence of the homogeneous and inhomogeneous ionosphere on the orientation angle of the horizontal magnetic vectors of the long-time geomagnetic pulsations is under consideration in this study. It was realized that this angle is small in the case of the homogeneous ionosphere for both the Alfvén and magnetosonic types of oscillations. An increase in the ionospheric electric field was discovered as the ionospheric conductivity changes during the switch from day to night conditions. It is valid only for the initial Alfvén wave. The ionospheric equivalent current systems excited by the initial magnetospheric waves of Alfvén and magnetosonic types as well as their behavior near the terminator were studied for different seasons. For the Alfvén source, seasonal variations of the orientation angle close to sunrise at the equator depend on the type of source: odd or even modes of Alfvén oscillations excite observable pulsations. It was found that the ionospheric two-vortex equivalent current system of the long-period pulsations arising in high-latitudes in the equatorial region alters not only its direction, but its intensity too. The largest anomaly (\sim25% of the source value) would be expected near the terminator. A new experimental method was suggested to recognize the type of incident magnetospheric waves by implementing observations either at a single observatory or at a couple of observatories. In the case of a single observatory it is proposed to study the frequency dependence of the orientation angle of their magnetic components close to sunrise. If the initial wave is magnetosonic, this angle must not be changed as a function of the local time within the wide frequency range of pulsations. When pulsations have an orientation angle sensitive to the presence of the terminator, they may be classified as both Alfvén and magnetosonic. For the Alfvén waves no frequency dependence of the orientational angle is peculiar. On the contrary, magnetosonic waves should be determined as oscillations with an orientational angle proportional to the frequency. These oscillations may be revealed at observatories located on the high-resistance cross sections. The example of the spectral-temporal analysis of pulsation at the equatorial observatory in Huancayo was demonstrated to confirm the proposed experimental technique. A weak dependence of the orientation angle anomaly on the frequency near the terminator was found. The latter is evidence for the dominant contribution of the Alfvén waves to low-latitude and equatorial oscillations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00585-996-0647-9
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  • 3
    Electronic Resource
    Electronic Resource
    An initial response of magnetic fields at geosynchronous orbit to Pi 2 onset as observed from the dip-equator (1998)
    Springer
    Annales geophysicae 16 (1998), S. 542-548 
    Details
    ISSN: 0992-7689
    Keywords: Magnetospheric physics ; Magnetospheric configuration and dynamics ; MHD waves and instabilities ; Plasmasphere
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Fluxgate magnetometer data recorded at the dip-equator (Huancayo, Peru; 1.44°N, 355.9° in geomagnetic coordinates; 12.1°S, 75.2°W in geographic coordinates; L = 1.00) with higher accuracy of timing (0.1 s) and amplitude resolution (0.01 nT) were utilized to survey an onset of Pi 2 pulsations in the midnight sector (2100–0100 LT) during PROMIS (Polar Region and Outer Magnetosphere International Study) periods (1 March–20 June, 1986). It is found that changing field line magnitude and vector as observed by magnetometer on board the synchronous satellites in the midnight sector often takes place simultaneously with the onset of Pi 2 pulsations at the dip-equator. The field disturbances that follow thereafter tend to last for some time both at the geosynchronous altitudes and the dip-equator. In this report, we examine the initial response of the field lines in space, and attempt to classify how the field line vector changed in the meridional plane.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00585-998-0542-7
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  • 4
    Electronic Resource
    Electronic Resource
    Propagation of electron waves in a plasma at lower frequency than plasma frequency
    Amsterdam : Elsevier
    Physics Letters A 36 (1971), S. 149-150 
    Details
    ISSN: 0375-9601
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0375-9601(71)90789-4
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Distributions of tangential discontinuity in the corotating solar wind structure
    Amsterdam : Elsevier
    Planetary and Space Science 24 (1976), S. 621-628 
    Details
    ISSN: 0032-0633
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0032-0633(76)90030-1
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Thin layered field aligned current in the solar wind
    Amsterdam : Elsevier
    Planetary and Space Science 26 (1978), S. 1027-1031 
    Details
    ISSN: 0032-0633
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0032-0633(78)90026-0
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  • 7
    Electronic Resource
    Electronic Resource
    Ionospheric equivalent current systems of low-latitude Pc3 pulsations
    Amsterdam : Elsevier
    Planetary and Space Science 36 (1988), S. 641-653 
    Details
    ISSN: 0032-0633
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0032-0633(88)90112-2
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  • 8
    Electronic Resource
    Electronic Resource
    Spatial phase structure of low-latitude Pc3-4 pulsations
    Amsterdam : Elsevier
    Planetary and Space Science 33 (1985), S. 1073-1079 
    Details
    ISSN: 0032-0633
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0032-0633(85)90026-1
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  • 9
    Electronic Resource
    Electronic Resource
    Further investigation on distributions of tangential discontinuity in the solar wind
    Amsterdam : Elsevier
    Planetary and Space Science 24 (1976), S. 1043-1047 
    Details
    ISSN: 0032-0633
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0032-0633(76)90122-7
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