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  • 1
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    Short term magnetospheric particle variations (1 minute T 1 day), appendix 1 (1979)
    In:  CASI
    Details
    Publication Date: 2006-01-16
    Description: A schematic representation of the generation and propagation processes for energetic particles of concern in solar terrestrial predictions is given. Particle precipitation at low, mid, and high altitudes is discussed with emphasis on prediction techniques. Methods given for testing of such techniques include traditional collaborations, enhanced collaborations, simulated prediction schemes, and field tests.
    Keywords: GEOPHYSICS
    Type: NASA. Marshall Space Flight Center Solar-Terrest. Predictions Proc., Vol. 2; p 433-440
    Format: text
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  • 2
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    An observation of polar auroral and airglow from the ISIS-II spacecraft. (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: This is a preliminary but comprehensive report on coordinated data obtained with the ISIS-II spacecraft, fourth in the ISIS series, launched 1 April 1971, into a near circular 1400 km orbit. The capabilities of the ISIS-I spacecraft have been extended in a number of ways, including the global mapping of the 3914, 5577 and 6300 A emissions. Data obtained during a 30-min pass over the south pole depict the nightside oval and polar cap, as well as mid-latitude airglow effects; these data are described and discussed.
    Keywords: GEOPHYSICS
    Type: Planetary and Space Science; 21; May 1973
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  • 3
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    Spacelab energetic ion mass spectrometer (1980)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Basic design criteria are given for an ion mass spectrometer for use in studying magnetospheric ion populations. The proposed instrument is composed of an electrostatic analyzer followed by a magnetic spectrometer and simultaneously measures the energy per unit and mass per unit charge of the ion species. An electromagnet is used for momentum analysis to extend the operational energy range over a much wider domain than is possible with the permanent magnets used in previous flights. The energetic ion source regions, ion energization mechanisms, field line tracing, coordinated investigations, and orbit considerations are discussed and operations of the momentum analyzer and of the electrostatic energy analyzer are examined.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA. Marshall Space Flight Center Space Plasma Phys. Active Expt.; p 91-106
    Format: application/pdf
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  • 4
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    An unusual SAR arc observed during ring current development, 4 August 1972 (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: An unusual SAR arc observed during the growth phase of the ring current is described. Proton precipitation was observed, with electron temperature enhancements throughout the region, and an F-region trough present at the equatorward boundary; a high flux of low energy at the SAR arc location and a 'slot' in the ambient electron density are characteristic of this event. Comparisons are made with S3-A spacecraft observations made in the equatorial region at the same time and with Isis-II observations of a more normal SAR arc; the kinetic Alfven process described by Hasegawa and Mima (1978) appears to account for the acceleration of these low energy electrons, although an auroral-type acceleration process cannot be excluded.
    Keywords: GEOPHYSICS
    Type: Planetary and Space Science; 28; Jan. 198
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  • 5
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    The suprathermal electron contributions to high-latitude Birkeland currents (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The paper extends the search for return current carriers to the thermal energy range for electrons, using simultaneous observations on Isis 2 by a magnetometer, retarding potential analyzer, and soft particle spectrometer. Each instrument is described along with data available. Simple magnetic models are used to illustrate how magnetic perturbations may be interpreted as currents remote from the satellite or local to it and that the choice of model cannot be uniquely established by magnetometer measurements alone.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 85; May 1
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  • 6
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    Plasmapause signatures in the ionosphere and magnetosphere (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Isis 2 observations of a variety of topside ionospheric 'signatures' of the plasmapause are compared with simultaneously acquired equatorial electron-density profiles obtained by the whistler technique. The satellite data were acquired at about 1400-km altitude at dusk and dawn in the sunlit Northern Hemisphere summer ionosphere within about 15 deg longitude of the VLF receiver. Results suggest that the dynamics of plasma coupling between the ionosphere and plasmasphere dominate the topside data and obscure the location of the equatorial plasmapause field line. The total density and light-ion troughs begin 2 to 10 deg equatorward of the field line through the equatorial plasmapause and are not clear plasmapause signatures. The invariant latitude of the region of steep spatial gradient in thermal plasma density, the plasmapause, appears to increase with altitude. Thus measurements of its position at different altitudes may give different results. Plasma-sheet electrons, however, are observed on field lines just outside the equatorial plasmapause at both dawn and dusk. Their low-latitude extent at 1400-km altitude can be used as a signature of the equatorial plasmapause position.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 83; Mar. 1
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  • 7
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    A snapshot of the polar ionosphere (1976)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: This paper presents a picture of the north polar F layer and topside ionosphere obtained primarily from three satellites (Alouette 2, ISIS 1, ISIS 2) that passed over the region within a time interval of about 50 min on a magnetically quiet day. The horizontal distribution of electron densities at the peak of the F layer is found to be similar to synoptic results from the IGY. Energetic-particle and ionospheric-plasma data are also presented, and the F-layer data are discussed in terms of these measurements as well as in terms of electric-field and neutral N2 density measurements made by other satellites on other occasions. The major feature observed is a tongue of F-region ionization extending from the dayside across the polar cap, which is accounted for by antisunward drift due to magnetospheric convection. In the F layer and topside ionosphere, the main effect of auroral precipitation appears to be heating and expansion of the topside. A region of low F-layer density appears on the morning side of the polar cap, which may be due to convection and possibly also to enhanced N2 densities.
    Keywords: GEOPHYSICS
    Type: Planetary and Space Science; 24; Jan. 197
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  • 8
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    Studies of high latitude current systems using MAGSAT vector data (1981)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The magnetic disturbance fields caused by global external current systems are considered with particular emphasis on improving the understanding of the physical processes which control high latitude current systems. Following processing the MAGSAT data were routinely plotted in the Universal Time (UT) format as well as in a polar plot format. The H'D'U' coordinate system, was adopted as the standard for representing the MAGSAT residual magnetic field vectors. A data file was generated and the TPOLAR computer code was developed to determine from the orbital elements, the time, latitude, and MLT of the extremum latitude of each transpolar segment of orbit. The precision of the vector data set from MAGSAT prompted an extended exploratory phase for data analysis procedures, modeling techniques and phenomenology.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E82-10188 , NASA-CR-168616 , NAS 1.26:168616 , PR-3
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  • 9
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    Energetic particle precipitation into the high-latitude ionosphere and the auroral electrojets. II - Eastward electrojet and field-aligned current flow at the dusk meridian (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 84; May 1
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  • 10
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    Isis 1 observations of the high-latitude ionosphere during a geomagnetic storm. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The Isis 1 satellite has made measurements of several ionospheric and related parameters, and the results of the various measurements have been compared in detail for two north transpolar passes during the geomagnetic storm of February 3, 1969. Simultaneous measurements were made of local electron and ion densities and temperatures, electron density between the satellite and the peak of the F layer, radio noise, and particle fluxes over a wide energy range extending down to 10 eV. Several features of the ionosphere (in particular, enhancements of radio noise, scale height, and plasma temperatures) appear to be due to soft-particle (100 eV to 1 keV) precipitation, which is related to magnetospheric structure as delineated by the observation of more energetic particles. The magnetosheath particles precipitating on the dayside of the polar cap are particularly effective.
    Keywords: GEOPHYSICS
    Type: AD-759885 , AFCRL-TR-73-0271 , Journal of Geophysical Research; 77; Nov. 1
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