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  • 1
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    Mass loading and velocity diffusion models for heavy pickup ions at comet Grigg-Skjellerup (1993)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: We compare model predictions of cometary water group ion densities and the solar wind slow down with measurements made by the Giotto Johnstone plasma analyzer implanted ion sensor at the encounter with comet Grigg-Skjellerup (G-S) on July 10, 1992. The observed slope of the ion density profile on approach to the comet is unexpectedly steep. Possible explanations for this are discussed. We present also a preliminary investigation of the quasilinear velocity-space diffusion of the implanted heavy ion population at G-S using a transport equation including souce, convection, adiabatic compression, and velocity diffusion terms. Resulting distributions are anisotropic, in agreement with observations. We consider theoretically the waves that may be generated by the diffusion process for the observed solar wind conditions. At initial ion injections, waves are generated at omega approximately Omega(sub i) the ion gyrofrequency, and lower frequencies are predicted for diffusion toward a bispherical shell.
    Keywords: ASTROPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 98; A12; p. 20,995-21,002
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  • 2
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    Mirror modes and fast magnetoacoustic waves near the magnetic pileup boundary of comet P/Halley (1993)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Large-amplitude ultralow-frequency wave structure observed on both sides of the magnetic pileup boundary of comet P/Halley during the flyby of the Giotto spacecraft have been analyzed using suprathermal electron density and magnetic field observations. Upstream of the boundary, electron density and magnetic field magnitude variations are anticorrelated, while in the pileup region these quantities are clearly correlated. Both in front of and behind the pileup boundary the observed waves are quasi-perpendicular wave structures as a minimum variance analysis shows. A detailed comparison of our observations in the prepileup region with theoretical and numerical results shows that the mirror mode mode waves may have been generated by a mirror instability driven by the pressure anisotropy of the ring-type distributions of the heavy (water group) pickup cometary ions.
    Keywords: ASTROPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 98; A12; p. 20,955-20,964
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  • 3
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    CDAW 7 revisited - Further evidence for the creation of a near-earth substorm neutral line (1990)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Eastman et al. (1988) have interpreted the CDAW 7 substorm of April 24, 1979, previously taken as unambiguously supporting the near-earth neutral line model of magnetospheric substorms, in terms of spatial movements of a preexisting plasma-sheet boundary layer (PSBL) and its associated current sheets across the observing ISEE 1 and 2 spacercraft. It is presently noted that, by contrast, a reinvestigation of ISEE 1 and 2 energetic particle measurements around substorm onset on short time-scales shows the observed flux pattern to require the formation of a particle source eastward of the ISEE spacecraft, well within the plasma sheet, associated with the substorm onset. Strong flows were absent prior to substorm onset, indicating the temporal nature of the event, as opposed to an encounter with a preexisting PSBL containing large flows.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 95; 12045-12
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  • 4
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    Line emission in the X-ray background (1971)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Line emission in X ray background in galactic plane and at galactic pole based on rocket flight data
    Keywords: SPACE RADIATION
    Type: ; SEARCH(
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  • 5
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    The X-ray spectra of the Crab Nebula and NP 0532 (1971)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Crab Nebula and pulsar NP 0532 X ray spectra discussing pulse profile, emission and interstellar absorption
    Keywords: SPACE RADIATION
    Type: ; BROTECHNIKA, NO. 1(
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  • 6
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    Study of the high-latitude, outer-zone boundary region for greater than or equal to 40-kev electrons with satellite Injun 3 (1970)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: High altitude outer radiation zone boundary region electron energy measurement by satellite Injun 3, noting angular distribution dependence on local time, latitude, etc
    Keywords: SPACE RADIATION
    Type: ; TROPHYSICAL JOURNAL
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  • 7
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    X-ray intensity fluctuations in Cygnus XR-1 (1971)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Cygnus XR-1 X ray intensity fluctuations, discussing time scales and periodicities
    Keywords: SPACE RADIATION
    Type: ; IENCES (
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  • 8
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    Energy spectra and pitch angle distributions of storm-time and substorm injected protons. (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Discussion of the energy spectra and pitch angle distributions of ring current protons observed with the solid-state proton detector of Explorer 45 during the main and fast recovery phases of a storm on Dec. 17, 1971. Appearances of characteristic changes in the pitch angle distributions of roughly 100-eV protons are interpreted as pitch angle dispersion of rapidly injected protons during their azimuthal drift at L values above 5.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 78; Aug. 1
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  • 9
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    Electron contamination in a mid-latitude soft X-ray astronomy experiment during an intense magnetic storm (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: A large area X-ray sky survey payload was launched from White Sands Missile Range (106 deg W 32 deg N) on 1 Nov. 1972 at 0530 hours U.T. The launch time coincided with intense geomagnetic activity (3 hour K sub p index = 8) following a solar flare. The data have been analyzed to determine possible contamination of X-ray data by large fluxes of low energy electrons that can precipitate down to low altitudes during magnetic storms. There is clear evidence in the data for low energy electrons of 10 - 50 keV contributing appreciably at about 200 km altitude in the 1 - 10 keV X-ray energy channels of the proportional counters used for the X-ray observations. The McIlwain parameters L and B for this altitude at White Sands are 1.25 and 0.46G, respectively.
    Keywords: SPACE RADIATION
    Type: NASA. Goddard Space Flight Center Proc. of the Workshop on Electron Contamination in X-ray Astronomy Expt.; 21 p
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  • 10
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    Estimation of crown closure from AVIRIS data using regression analysis (1993)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Crown closure is one of the input parameters used for forest growth and yield modelling. Preliminary work by Staenz et al. indicates that imaging spectrometer data acquired with sensors such as the Airborne Visible/Infrared Imaging Spectrometer (AVIRIS) have some potential for estimating crown closure on a stand level. The objectives of this paper are: (1) to establish a relationship between AVIRIS data and the crown closure derived from aerial photography of a forested test site within the Interior Douglas Fir biogeoclimatic zone in British Columbia, Canada; (2) to investigate the impact of atmospheric effects and the forest background on the correlation between AVIRIS data and crown closure estimates; and (3) to improve this relationship using multiple regression analysis.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: JPL, Summaries of the 4th Annual JPL Airborne Geoscience Workshop. Volume 1: AVIRIS Workshop; p 169-172
    Format: application/pdf
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