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  • 1
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    Global Geospace Science (GGS) Program and the Polar Satellite (1996)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: The Global Geospace Science (GGS) program's Polar satellite is reported on. The satellite aims to measure: the plasma flux in the polar magnetosphere and the geomagnetic tail; the plasma flux to and from the ionosphere, and the deposition of particle energy in the upper atmosphere. To accomplish these objectives, the satellite was placed on a 86 deg inclination, elliptical orbit whose apogee is located over the northern polar region. The spacecraft carries instruments for observing and measuring the magnetic field and charged particles as well as the imaging instruments.
    Keywords: Geophysics
    Type: Third International Conference on Substorms (ICS-3); 721-724; ESA-SP-389
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    The Large-Scale Current System During Auroral Substorms (2014)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: We present an empirical model of the equivalent current system in the ionosphere during the peak of a classical bulge-type auroral sub storm. This model is derived from measurements made by ~110 ground magnetometer stations during 116 substorms. The data are temporally and spatially organized using global auroral images obtained by the Polar Visible Imaging System Earth Camera. The empirical equivalent current system displays three key features: a poleward shift of the westward electrojet connecting the postmidnight and premidnight components; a polar cap swirl; and significantly different magnitudes of the postmidnight and premidnight westward electrojets. This leads us to propose a two-wedge current system linking the ionosphere to the magnetosphere. The bulge current wedge is located in the premidnight region just equatorward of the open-closed field line boundary while another three-dimensional current system is located in the postmidnight region well within the auroral oval. We use Biot and Savart calculations and Tsyganenko mapping and show that this new model is a likely solution for the large-scale current system.
    Keywords: Geophysics
    Type: GSFC-E-DAA-TN22625 , Journal of Geophysical Research: Space Physics (ISSN 2169-9402) (e-ISSN 2169-9402); 119; 6; 4591-4606
    Format: text
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    NASA TECHNICAL REPORTS
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