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  • SPACE SCIENCES  (3)
  • ASTROPHYSICS  (1)
  • PLASMA PHYSICS  (1)
  • 1
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    Transfer of pulsation-relation wave activity across the magnetopause: Observations of corresponding spectra by ISEE-1 and ISEE-2 (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Comparison of power spectra of magnetic field data from ISEE-1 and -2 recorded simultaneously on both sides of the magnetopause showed that power level inside the magnetosphere varied with power level outside in the magnetosheath and suggested that the same frequencies were enhanced on the two sides of the boundary. Power levels were two to three orders of magnitude lower inside than outside the magnetosphere, indicating that wave energy was transmitted inside from the sheath.
    Keywords: PLASMA PHYSICS
    Type: TRW-36116-6004-UT-00 , Plasma Wave Expt. for the ISEE-3 Mission; 14 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Magnetic fluctuations during magnetospheric substorms. I (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Large amplitude irregular magnetic fluctuations during expansion phase of magnetic substorms, using ATS 1 observations
    Keywords: SPACE SCIENCES
    Type: ; ADEMIE DES SCIENCES
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    NASA TECHNICAL REPORTS
  • 3
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    Outer magnetosphere near midnight at quiet and disturbed times. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Ogo 5 magnetic-field and energetic-electron (E greater than 50 keV) data are used to study both the quiet-time, steady-state configuration of the outer magnetosphere or near tail region near midnight and the disturbed time changes of this configuration. The nighttime cusp is found to be a distinct feature within the plasma sheet at quiet times but indistinguishable from the plasma sheet at disturbed times. The sequence of thinning and expansion of the plasma sheet in this region in association with the substorms is studied. The response of the plasma sheet in the near tail at about 10 earth radii is found to be similar to that in the more distant tail at more than 20 earth radii. Finally, the nature of field-aligned currents flowing on the plasma-sheet boundary is investigated. Assuming infinite current sheets, the sheet current density at Ogo 5 is found to be approximately .01 A/m.
    Keywords: SPACE SCIENCES
    Type: NSSDC-ID-68-014A-13-PM , NSSDC-ID-68-014A-14-PM , Journal of Geophysical Research; 77; Oct. 1
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    NASA TECHNICAL REPORTS
  • 4
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    The magnetotail and substorms (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The tail plays a very active and important role in substorms. Magmetic flux eroded from the dayside magnetosphere is stored here. As more and more flux is transported to the magnetotail and stored, the boundary flares more, the field strength in the tail increases, and the currents strengthen and move closer to the earth. Further, the plasma sheet thins and the magnetic flux crossing the neutral sheet lessens. The experimental evidence for these processes is discussed and a phenomenological or qualitative model of the substorm sequence is presented. In this model, the flux transport is driven by the merging of the magnetospheric and interplanetary magnetic fields. During the growth phase of substorms the merging rate on the dayside magnetosphere exceeds the reconnection rate in the neutral sheet.
    Keywords: SPACE SCIENCES
    Type: NSSDC-ID-68-014A-06-OS , NSSDC-ID-68-014A-13-PS , NSSDC-ID-68-014A-14-PM , Space Science Reviews; 15; Nov
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  • 5
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    Solar wind triggering of substorm expansion onset (1986)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: A substantial fraction of all substorms with sudden onsets, as identified by minima in the AL index, are found to be triggered by the IMF. Analysis of data from the first six months of 1978 shows auroral zone magnetic records to be disturbed most of the time, with distinct substorms identified in 23 percent of these disturbed hours. For the subset of substorms with sharp onsets and corresponding solar wind data, 44 percent are found to be correlated with northward turnings of the IMF, while 28 percent occur during steady southward IMF. The results suggest that sharp substorm expansion onset is caused by a process internal to the magnetosphere which can be influenced by changes in the solar wind stress applied to the magnetosphere.
    Keywords: ASTROPHYSICS
    Type: Journal of Geomagnetism and Geoelectricity (ISSN 0022-1392); 38; 11 1
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    NASA TECHNICAL REPORTS
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