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  • 1
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    POLAR/TIDE Perigee Observations of Thermal O(+) Characteristics in the Polar Cap Region (1998)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: We analyze in situ moment measurements of thermal O(+) from the Thermal Ion Dynamics Experiment (TIDE) on POLAR for April - May, 1996. These measurements were obtained near 5000 km altitude within the polar cap ionosphere - magnetosphere interface region. Su explored certain aspects of O(+) parameters in this region. In this report, we hope to expand our knowledge of the O(+) behavior by examining relationships of densities, parallel velocities, and temperatures to the convection velocities, IMF By and Bz components. Preliminary studies with the convection velocities currently require further analysis. In doing so, we are guided in part by the Cleft Ion Fountain paradigm and model developed by which involves downward O(+) flows in the polar magnetosphere. Initial results tend to indicate that in the extreme antisunward region of the polar cap, the density decreases with increasing convection velocity.
    Keywords: Geophysics
    Type: Modeling; Oct 26, 1998; Guntersville, AL; United States
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    NASA TECHNICAL REPORTS
  • 2
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    Polar/Tide Observations of Field Aligned O(+) Flows at 5000 km Altitude over the Auroral Regions in Comparison to UVI Auroral Images (1999)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: Measurements of thermal O(+) ion parameters from the Thermal Ion Dynamics Experiment (TIDE) on POLAR obtained near 5000 km altitude are compared with auroral images from the Ultra Violet Imager (UVI), for southern perigee passes. Ion parameters, including parallel velocity, density, and flux are combined with simultaneous auroral images to investigate relationships between their properties and the structure and brightness of the auroral forms. Results indicate field aligned upflowing O(+) ions over bright auroral regions and downward flows over dark regions. These and other relationships will be presented for several POLAR passes when both ion measurements and auroral images are observed under favorable conditions for comparison.
    Keywords: Geophysics
    Type: Jun 02, 1999; Boston, MA; United States
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  • 3
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    Partnerships Form the Basis for Implementing a National Space Weather Plan (2017)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The 2017 Space Weather Enterprise Forum, held June 27, focused on the vital role of partnerships in order to establish an effective and successful national space weather program. Experts and users from the many government agencies, industry, academia, and policy makers gathered to discuss space weather impacts and mitigation strategies, the relevant services and supporting infrastructure, and the vital role cross-cutting partnerships must play for successful implementation of the National Space Weather Action Plan.
    Keywords: Geophysics
    Type: GSFC-E-DAA-TN51697 , Space Weather (ISSN 1539-4956) (e-ISSN 1542-7390); 15; 8; 972-973
    Format: application/pdf
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  • 4
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    Polar Wind Measurements with TIDE/PSI and HYDRA on the Polar Spacecraft (1998)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: The Thermal Ion Dynamics Experiment (TIDE) on the POLAR spacecraft has allowed sampling of the three-dimensional ion distributions with excellent energy, angular, and mass resolution. The companion Plasma Source Instrument, when operated, allows sufficient diminution of the electric potential to observe the polar wind at very high altitudes. In this presentation, we will describe the results of polar wind characteristics H+, He+, and 0+ as observed by TIDE at 5000 km and 8 RE altitudes. The relationship of the polar wind parameters with the solar zenith angle and with the day-night distance in the Solar Magnetic coordinate system will also be presented. We will compare these measurements with recent simulations of the photoelectron-driven polar wind using a couple fluid-semikinetic model. In addition, we will compare these polar wind observations with low-energy electrons sampled by the HYDRA experiment on POLAR to examine possible effects of the polar rain and photoelectrons and hopefully explain the large ion outflow velocity variations at POLAR apogee.
    Keywords: Geophysics
    Type: Jul 17, 1998; Taipei; Taiwan, Province of China
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