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  • GEOPHYSICS  (7)
  • 1975-1979  (7)
  • 1
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    Plasma wave turbulence at the magnetopause - Observations from ISEE 1 and 2 (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: An investigation of plasma wave electric and magnetic fields in the vicinity of the magnetopause using measurements from the ISEE 1 and 2 spacecraft is presented. Strong electric and magnetic field turbulence is often observed at the magnetopause; the electric field spectrum of this turbulence extends from less than a few hertz to over 100 kHz, and the magnetic field from a few hertz to about 1 kHz. Similar turbulence spectra are observed in association with flux transfer events and possible 'inclusions' of boundary layer plasma in the magnetosphere. Two possible plasma instabilities, the electrostatic ion-cyclotron and the lower-hybrid-drift instability, should explain the broad-band electric field turbulence; the narrow-band electrostatic emissions near the local electron plasma frequency are believed to be plasma oscillations or electrostatic waves near the upper-hybrid-resonance frequency.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 84; Dec. 1
    Format: text
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  • 2
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    Initial results from the ISEE-1 and -2 plasma wave investigation (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A survey of initial results from the plasma-wave investigation on the ISEE 1 and 2 spacecraft is presented. The plasma-wave instruments employed are designed to provide measurements of the electric and magnetic fields of plasma waves over the frequency range from about 5 Hz to 300 kHz. Several representative satellite passes are analyzed in detail and discussed. The results considered are shown to demonstrate the very high-quality data being obtained with the instruments and to illustrate the wide range of magnetospheric plasma-physics problems that can be treated with the ISEE spacecraft. Comparisons of plasma-wave spectra between the two spacecraft are performed which indicate the great advantages of using two spacecraft in similar orbits to unravel the complex spatial and temporal variations that occur in the magnetosphere.
    Keywords: GEOPHYSICS
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  • 3
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    Magnetosheath lion roars (1976)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The characteristics of lion roars, which are intense packets of electromagnetic waves characteristically found in the magnetosheath, are studied. The average frequency of the emissions is 120 Hz, with over 90% occurring between 90 and 160 Hz (which is near one-half the local electron gyrofrequency); over 70% of all emissions last a mere 2 sec or less; the maximum amplitude of lion roars has an average value of 85 milligamma, over 80% being between 40 and 160 milligamma. Occurrence of lion roars is related to the level of geomagnetic activity, measured by Kp. The probability of occurrence ranges from 10% during magnetically quiet intervals to 75% during disturbed periods. Polarization and wave normal direction of lion roars, determined by variance analysis of triaxial wave forms, are righ-handed circularly polarized, with propagation essentially along the ambient magnetic field.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 81; May 1
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  • 4
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    Two types of magnetospheric ELF chorus and their substorm dependences (1977)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The distribution of extremely low frequency (10-1500 Hz) magnetospheric chorus to all local times and latitudes is investigated in order to determine dependence on substorms, and to evaluate the conditions under which chorus is generated. The analysis carefully separates space and time effects by an investigation of data obtained by the OGO 5 search coil magnetometer. A study of spatial dependencies shows that chorus occurs in two magnetic regions: equatorial chorus is located near the equator, and high-latitude chorus is located above 15 degrees. An analysis of chorus in each of the regions illustrates that equatorial chorus is definitely related to substorm, whereas high-latitude chorus often occurs within magnetically quiet intervals.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 82; Nov. 1
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  • 5
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    Electromagnetic hiss and relativistic electron losses in the inner zone (1975)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: It is shown that ELF hiss is present in the inner radiation zone (L less than 2) during both storms and substorms. This presence is ascribed to propagation of waves into this region from a distributed source located at high altitude near the equatorial plasmapause. Two major effects allow hiss to reach the inner zone during storms and substorms: (1) the observed tendency for plasmaspheric hiss to be greatly intensified during the recovery phase as the outward-moving plasmapause encounters the electrons that have been freshly injected into the magnetosphere; (2) the displacement of the plasmapause, and the presumed source region, to low altitudes during high levels of magnetic activity.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 80; Feb. 1
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  • 6
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    Chorus, energetic electrons and magnetospheric substorms (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The paper investigates possible chorus generation mechanisms by means of simultaneous OGO-5 measurements of chorus, energetic (79 + or - 23 keV) electron fluxes and pitch angle distributions, and ambient magnetic fields. Further, the solar wind data during high-latitude dayside chorus events are examined. It is reported that the highly eccentric orbit had an apogee of 24 earth radii and an inclination of 30 deg to the geographic equator.
    Keywords: GEOPHYSICS
    Type: Wave instabilities in space plasmas; Jul 31, 1978 - Aug 08, 1978; Helsinki; Finland
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  • 7
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    Does ELF chorus show evidence of power line stimulation (1979)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: A study to determine the effect of power line radiation on the stimulation of the ELF chorus detected on OGO-5 is presented. Chorus shows a maxima over the Eastern USSR, Greenland, and Central Siberia and minima over central and Eastern Canada, a distribution different than the OGO-3. This discrepancy is explained as due to data oversampling in the previous study; the OGO-5 data were reanalyzed with the oversampling removed, showing that none of the longitudinal maxima or minima are statistically significant. It is concluded that there is no significant correlation between longitude and chorus occurrence which implies that there is little or no evidence of power line harmonic radiation effects on chorus triggering.
    Keywords: GEOPHYSICS
    Type: Wave instabilities in space plasmas; Jul 31, 1978 - Aug 08, 1978; Helsinki; Finland
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