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  • Other Sources  (19)
  • 1985-1989  (19)
  • 1970-1974
  • 1950-1954
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  • 1
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    General features of the Comet Halley-solar wind interaction from plasma measurements (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The Giotto Complete Positive ion, Electron and Ram Negative Ion measurements near Comet Halley plasma experiment identified regions in which the solar wind interaction with the cometary plasma displayed characteristic features. Beginning 4.6 million km from the comet there is an upstream region with sporadic connection to the comet. An electron foreshock is present up to 250,000 km away from the bow shock. A bow shock is detected at 1.15 million km. Between the bow shock and the cometopause the outer regions can be divided into three parts. A cometopause is found at 135,000 km, and a density decrease is detected at 45,000 km from the comet. The detailed plasma features associated with these regions are described.
    Keywords: ASTROPHYSICS
    Type: ESA Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 1: Plasma and Gas; p 29-34
    Format: text
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  • 2
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    The composition of heavy molecular ions inside the ionopause of Comet Halley (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The RPA2-PICCA instrument aboard the Giotto spacecraft obtained 10-210 amu mass spectral of cold thermal molecular ions in the coma of Comet Halley. The dissociation products of the long chain formaldehyde polymer polyoxymethylene (POM) have recently been proposed as the dominant complex molecules in the coma of Comet Halley; however, POM alone cannot account for all of the features of the high resolution spectrum. An important component of the dust at Comet Halley is particles highly enriched in carbon, hydrogen, oxygen, and nitrogen relative to the composition of carbonaceous chondrites. Since this dust could be a source for the heavy molecules observed by PICCA, a search was conducted for other chemical species by determining all the molecules with mass between 20 and 120 amu which can be made from the relatively abundant C, H, O, and N, without regard to chemical structure.
    Keywords: ASTROPHYSICS
    Type: NASA, Ames Research Center, Interstellar Dust: Contributed Papers; p 451-452
    Format: application/pdf
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  • 3
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    The upstream region, foreshock and bow shock wave at Halley's Comet from plasma electron measurements (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Halley plasma electron parameters from 2.7 million km from the comet nucleus to the bow shock wave at 1.1 million km and beyond are surveyed. The features of the electron foreshock lying outside the shock to a distance of 230,000 km are described. It is a region of intense solar wind-comet plasma interaction in which energetic electrons are prominent. Several spikes of electrons whose energies extend to 2.5 keV appear in front of the shock. These energetic electrons may be accelerated in the same way electrons are accelerated at the Earth's bow shock to energies of 1 to 10 keV. The direction of the electron bulk flow direction changes abruptly between 1920 and 1922 UT, and the flow speed begins a sharp decline at the same time. It is suggested that the spacecraft entered the bow shock wave between 1920 and 1922 UT. Electron density variations at Halley are very much smaller than those at Giacobini-Zinner.
    Keywords: ASTROPHYSICS
    Type: ESA Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 1: Plasma and Gas; p 259-261
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  • 4
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    Derivation of heavy (10-210 AMU) ion composition and flow parameters for the Giotto PICCA instrument (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The Giotto heavy ion analyzer RPA2-PICCA was designed to identify the composition and distribution of heavy thermal positive ions in the coma of comet Halley. The instrument is an electrostatic analyzer which takes advantage of the large relative flyby velocity and the fact that the ions in the inner coma should be cold and predominantly singly charged. A method of deconvolving E/Q measurements to yield ion mass composition, temperature, and flow velocity is presented. The measurements are used to investigate the dynamic behavior of the ions and variations in mass composition as a function of cometary distance.
    Keywords: ASTROPHYSICS
    Type: ESA Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 1: Plasma and Gas; p 203-205
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  • 5
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    Magnetic field-aligned particle precipitation (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Magnetic field-aligned particle fluxes are a common auroral phenomenon. Precipitating field-aligned electrons are seen in the vicinity of auroral arcs as suprathermal bursts, as well as superimposed on the more isotropic inverted V electron precipitation. Electron distribution functions reveal two distinct source populations for the inverted V and field-aligned electron components, and also suggest possible acceleration mechanisms. The inverted V electrons are a hot, boundary plasma sheet population that gains the full parallel acceleration. The field-aligned component appears to originate from cold ionospheric electrons that may be distributed throughout the acceleration region. A turbulent parallel field might explain the apparent lifetime of cold electrons in the acceleration region.
    Keywords: GEOPHYSICS
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  • 6
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    Front-End Program for SYSGEN (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: SYSGEN, Power Generation System Production costing and Reliability Analysis program, simulates production costs and reliability of electric utility with and without time-dependent generating units. FEPS transforms inputs into proper formats, builds data files and adds Job Control Language necessary to running SYSGEN program.
    Keywords: ELECTRONIC SYSTEMS
    Type: NPO-15782 , NASA Tech Briefs (ISSN 0145-319X); 8; 3; P. 335
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  • 7
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    Variable frequency VLF signals in the magnetosphere Associated phenomena and plasma diagnostics (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Coherent variable-frequency signals (ramps) extending from 1 to 8 kHz, injected into the magnetosphere from Siple Station, Antarctica (L=4.3), exhibit upper and lower cutoffs when received at the conjugate station, Roberval, Quebec. Ramp group delay measurements and ionospheric sounding data are used to determine the cold plasma density and L shell of the propagation path. Relationships among f, df/dt, and the 'phase equator' for gyroresonance are calculated using second-order resonance equations generalized to relativistic electrons. The concept thereby introduced is used to develop a diagnostic technique which, for an assumed g(alpha)(v exp -n) electron distribution, provides an estimate of the energy dependence n. Additional aspects of the magnetospheric response to ramp injection, such as emission triggering, curvature due to dispersion, and amplitude saturation, are discussed.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 90; 1507-152
    Format: text
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  • 8
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    On the anticorrelation of the electric field and peak electron energy within an auroral arc (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The present investigation is concerned with an example of a strongly anticorrelated electric field and particle precipitation, taking into account an application of an extended version of the model of Evans et al. (1977) to the data. A striking feature of the data reported is the high degree of anticorrelation between electric field strength and peak precipitating electron energy. A simple model consisting of a constant current traversing a region in which the conductivities increase in proportion to ionospheric energy deposition provides a qualitative explanation of the observations. However, when the effects of neutral winds, ionization transport, Hall currents, and arc motion, and the nonlinearity of the relationship between peak precipitating electron energy and equilibrium are considered, the conclusions become less clear.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 90; 399-408
    Format: text
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  • 9
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    Complex organic ions in the atmosphere of Comet Halley (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The ordered series of broad mass groups in thermal ion mass spectra from the coma of Comet Halley obtained with the Positive Ion Cluster Composition analyzer is examined. It is found that the series is characteristic of molecules rich in H, C, N, and O, and does not necessarily imply the presence of a long chain polymer, such as polyoxymethylene. It is suggested that the spectra resemble those of singly-bonded CH2, NH, O, and H units which are similar to the molecules detected in laboratory analogs of icy interstellar dust grains.
    Keywords: ASTROPHYSICS
    Type: Advances in Space Research (ISSN 0273-1177); 9; 2 19; 35-39
    Format: text
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  • 10
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    On-board data analysis techniques for space plasma particle instruments (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: This article describes the on-board data analysis techniques used on two recent space plasma particle instruments to compute meaningful parameters of three-dimensional plasma distributions in real time. These parameters may be transmitted with much higher time resolution than the full distribution within the limited telemetry. In addition, they greatly reduce the ground processing requirements.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: Review of Scientific Instruments (ISSN 0034-6748); 60; 372-380
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