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  • Solar Physics  (6)
  • ENERGY PRODUCTION AND CONVERSION  (5)
  • 42.65  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Investigation of two-wave mixing in arbitrary oriented sillenite crystals (1996)
    Springer
    Applied physics 64 (1996), S. 49-56 
    Details
    ISSN: 0340-3793
    Keywords: PACS: 42.40 ; 42.65 ; 42.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract.  A generalized systematic description of the Two-Wave Mixing (TWM) process in sillenite crystals allowing for arbitrary orientation of the grating vector is presented. An analytical expression for the TWM gain is obtained for the special case of plane waves in a thin crystal (∣g∣d≪1) with large optical activity (∣g∣/ϱ≪1, g is the coupling constant, ϱ the rotatory power, d the crystal thickness). Using a two-dimensional formulation the scope of the nonlinear equations describing TWM can be extended to finite beams in arbitrary geometries and to any crystal parameters. Two promising applications of this formulation are proposed. The polarization dependence of the TWM gain is used for the flattening of Gaussian beam profiles without expanding them. The dependence of the TWM gain on the interaction length is used for the determination of the crystal orientation. Experiments carried out on Bi12GeO20 crystals of a non-standard cut are in good agreement with the results of modelling.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003400050144
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Comparison of CME masses and kinetic energies near the Sun and in the inner heliosphere (1995)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Masses have now been determined for many of the CMEs observed in the inner heliosphere by the HELIOS 1 and 2 zodiacal light photometers. The speed of the brightest material of each CME has also been measured so that, for events having both mass and speed determinations, the kinetic energies of the CMEs are estimated. We compare the masses and kinetic energies of the individual CMEs measured in the inner heliosphere by HELIOS and near the Sun from observations by the SOLWIND (1979-1983) and SMM coronagraphs (1980). Where feasible we also compare the speeds of the same CMEs. We find that the HELIOS masses and energies tend to be somewhat larger by factors of 2-5 than those derived from the coronagraph data. We also compare the distribution of the masses and energies of the HELIOS and coronagraph CMEs over the solar cycle. These results provide an important baseline for observations of CMEs from coronagraphs, from the ISEE-3/ICE, WIND and Ulysses spacecraft and in the future from SOHO.
    Keywords: Solar Physics
    Type: International Solar Wind 8 Conference; 97; NASA-CR-199940
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    The Solar Mass Ejection Imager (1995)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: We are designing a Solar Mass Ejection Imager (SMEI) capable of observing the Thomson-scattered signal from transient density features in the heliosphere from a spacecraft situated near AU. The imager is designed to trace these features, which include coronal mass ejections. corotating structures and shock waves, to elongations greater than 90 deg from the Sun. The instrument may be regarded as a progeny of the heliospheric imaging capability shown possible by the zodiacal-light photometers of the HELIOS spacecraft. The instrument we are designing would make more effective use of in-situ solar wind data from spacecraft in the vicinity of the imager by extending these observations to the surrounding environment. The observations from the instrument should allow deconvolution of these structures from the perspective views obtained as they pass the spacecraft. An imager at Earth could allow up to three days warning of the arrival of a mass ejection from the Sun .
    Keywords: Solar Physics
    Type: International Solar Wind 8 Conference; 97; NASA-CR-199940
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Predelivery cell and battery summary for SMM 20A h batteries (1981)
    In:  Other Sources
    Details
    Publication Date: 2016-06-07
    Description: Nickel cadmium batteries were performance tested and found to be compatible with the demands and goals of the Solar Maximum Mission flights.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA. Goddard Space Flight Center The 1980 Goddard Space Flight Center Battery Workshop; p 343-347
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    NASA TECHNICAL REPORTS
  • 5
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    Parallel 50 ampere hour nickel cadmium battery performance in the Modular Power Subsystems (MPS) (1980)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The thermal performance of 50-ampere-hour, nickel cadmium batteries for use in a modular spacecraft is examined in near-Earth orbit simulation. Battery voltage and temperature profiles for temperature extreme cycles are given and discussed.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA. Goddard Space Flight Center The 1979 Goddard Space Flight Center Battery Workshop; p 261-268
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    The 50 AMP-hour nickel cadmium battery manual (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The battery is designed with a minimum battery to cell weight ratio consistent with adequate containment for operating conditions and dynamic environments and minimized weight. The battery is fully qualified and the environments to which it was successfully subjected were selected by NASA Goddard to cover a wide range of probable uses. The battery is suitable for either near-Earth geosynchronous missions, is compatible with passive or active thermal control systems and may be electrically controlled by a variety of changing routines. The initial application of the 50 A.H. Battery is a near-Earth mission aboard the LANDSAT D Satellite.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-166701
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    The NASA Standard 20 Ampere Hour Nickel-Cadmium Battery Manual (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The NASA standard 20 ampere hour spacecraft nickel-cadmium battery in described. Mechanical electrical and thermal data are supplied. Both qualification and acceptance tests are described. Information on handling and storage is given.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-166700 , MMS-408-2101-0003
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    The effect of cell design and test criteria on the series/parallel performance of nickel cadmium cells and batteries (1983)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Three batteries were operated in parallel from a common bus during charge and discharge. SMM utilized NASA Standard 20AH cells and batteries, and LANDSAT-D NASA 50AH cells and batteries of a similar design. Each battery consisted of 22 series connected cells providing the nominal 28V bus. The three batteries were charged in parallel using the voltage limit/current taper mode wherein the voltage limit was temperature compensated. Discharge occurred on the demand of the spacecraft instruments and electronics. Both flights were planned for three to five year missions. The series/parallel configuration of cells and batteries for the 3-5 yr mission required a well controlled product with built-in reliability and uniformity. Examples of how component, cell and battery selection methods affect the uniformity of the series/parallel operation of the batteries both in testing and in flight are given.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-TM-84967 , NAS 1.15:84967 , Meeting of the Electrochem. Soc.; Oct 20, 1982; Detroit
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Is There a CME Rate Floor? CME and Magnetic Flux Values for the Last Four Solar Cycle Minima (2017)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The recent prolonged activity minimum has led to the question of whether there is a base level of the solar magnetic field evolution that yields a ''floor'' in activity levels and also in the solar wind magnetic field strength. Recently, a flux transport model coupled with magneto-frictional simulations has been used to simulate the continuous magnetic field evolution in the global solar corona for over 15 years, from 1996 to 2012. Flux rope eruptions in the simulations are estimated (Yeates), and the results are in remarkable agreement with the shape of the SOlar Heliospheric Observatory/Large Angle and Spectrometric Coronagraph Experiment coronal mass ejection (CME) rate distribution. The eruption rates at the two recent minima approximate the observed-corrected CME rates, supporting the idea of a base level of solar magnetic activity. In this paper, we address this issue by comparing annual averages of the CME occurrence rates during the last four solar cycle minima with several tracers of the global solar magnetic field. We conclude that CME activity never ceases during a cycle, but maintains a base level of 1 CME every 1.5 to approx. 3 days during minima. We discuss the sources of these CMEs.
    Keywords: Solar Physics
    Type: GSFC-E-DAA-TN53060 , The Astrophysical Journal (ISSN 0004-637X) (e-ISSN 1538-4357); 851; 2; 142
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    EVIDENCE OF POSTERUPTION RECONNECTION ASSOCIATED WITH CORONAL MASS EJECTIONS IN THE SOLAR WIND (2002)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Using a coupled 2.5-dimensional, time-dependent MHD model of the solar corona and inner heliosphere, we have simulated the eruption and evolution of a coronal mass ejection containing a flux rope all the way from the Sun to 1 AU. Although idealized, we find that the simulation reproduces many generic features of magnetic clouds. In this paper we report on a new, intriguing aspect of these comparisons. Specifically, the results suggest that jetted outflow, driven by posteruptive reconnection underneath the flux rope, occurs and may remain intact out to 1 AU and beyond. We present an example of a magnetic cloud with precisely these signatures and show that the velocity perturbations are consistent with reconnection outflow. We suggest that other velocity and/or density enhancements observed trailing magnetic clouds may be signatures of such reconnection and, in some cases, may not be associated with prominence material, as has previously been suggested.
    Keywords: Solar Physics
    Type: The Astrophysical Journal; 578; 972-978
    Format: text
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    NASA TECHNICAL REPORTS
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