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  • 1
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    The vibrational temperature of molecular nitrogen in the thermosphere (1969)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Thermospheric molecular nitrogen vibrational temperature, studying various chemical reactions and collisions as energy sources
    Keywords: GEOPHYSICS
    Type: ; DIOTEKHNIKA (|INTERNATIONAL ASSN. OF GEOMAGNETISM AND AERONOMY, GENERAL SCIENTIFIC ASSEMBLY; Sep 01, 1969 - Sep 12, 1969; MADRID; SPAIN
    Format: text
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  • 2
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    The ionosphere of Europa from Galileo radio occultations (1997)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The Galileo spacecraft performed six radio occultation observations of Jupiter's Galilean satellite Europa during its tour of the jovian system. In five of the six instances, these occultations revealed the presence of a tenuous ionosphere on Europa, with an average maximum electron density of nearly 10(4) per cubic centimeter near the surface and a plasma scale height of about 240 +/- 40 kilometers from the surface to 300 kilometers and of 440 +/- 60 kilometers above 300 kilometers. Such an ionosphere could be produced by solar photoionization and jovian magnetospheric particle impact in an atmosphere having a surface density of about 10(8) electrons per cubic centimeter. If this atmosphere is composed primarily of O2, then the principal ion is O2+ and the neutral atmosphere temperature implied by the 240-kilometer scale height is about 600 kelvin. If it is composed of H2O, the principal ion is H3O+ and the neutral temperature is about 340 kelvin. In either case, these temperatures are much higher than those observed on Europa's surface, and an external heating source from the jovian magnetosphere is required.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Science (ISSN 0036-8075); Volume 277; 5324; 355-8
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  • 3
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    Maser research program (1967)
    In:  CASI
    Details
    Publication Date: 2006-10-26
    Description: Materials preparation and microwave bench measurements for zero-field traveling wave maser
    Keywords: MASERS
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  • 4
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    LABORATORY AND FLIGHT TEST OF A SPECIAL PRESSURE GAUGE (1961)
    In:  CASI
    Details
    Publication Date: 2006-10-26
    Description: Laboratory and flight tests of a special pressure gauge
    Keywords: MACHINE ELEMENTS AND PROCESSES
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  • 5
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    Zodiacal light dynamics experiment: A wideband imaging Fabry-Perot interferometer (1978)
    In:  CASI
    Details
    Publication Date: 2006-01-16
    Description: The Solar Probe will provide an ideal platform from which to study dynamics of dust particles near the sun by measuring the detailed character of the Fraunhofer structure of the zodiacal light. The suggested instrument is a wideband imaging Fabry-Perot interferometer with state of the art technology in both the optics and the detector. The instrument would function as a high-resolution imaging device providing wavelength resolution of 0.03 A over about a 20 A range. The wideband imaging capability would provide sky maps of the zodiacal light on a despun spacecraft without mechanical scanning. The Solar Probe mission would allow the velocity distribution of the dust to be mapped along most of the trajectory of the spacecraft.
    Keywords: SOLAR PHYSICS
    Type: JPL A Close-up of the Sun; p 420-429
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  • 6
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    MEASUREMENTS OF ATMOSPHERIC PRESSURE, TEMPERATURE, AND DENSITY AT VERY HIGH ALTITUDES. (1961)
    In:  CASI
    Details
    Publication Date: 2012-03-21
    Description: Measurements of atmospheric pressure, temperature, and density at very high altitudes
    Keywords: FLUID MECHANICS
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  • 7
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    The Venus ionosphere and solar wind interaction (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The current state of knowledge of the chemistry, dynamics and energetics of the upper atmosphere and ionosphere of Venus is reviewed together with the nature of the solar wind-Venus interaction. Because of the weak, though perhaps not negligible, intrinsic magnetic field of Venus, the mutual effects between these regions are probably strong and unique in the solar system. The ability of the Pioneer Venus Bus and Orbiter experiments to provide the required data to answer the questions outstanding is discussed in detail.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Space Science Reviews; 20; June 197
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  • 8
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    Structure and dynamics of the ionosphere (1982)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: The structure of the Venus ionosphere and the major processes occurring within it are summarized. The daytime ionosphere is created by solar EUV radiation incident on the thermosphere; it is in photochemical equilibrium near its peak at about 142 km, where O2(+) is the major ion, and near diffusive equilibrium in its upper regions, where the major ion is O(+). The day-to-night plasma pressure gradient across the terminator drives a nightward ion flow which, together with electron precipitation, contributes to the formation of the nighttime ionosphere. Large-scale radial holes or plasma depletions extending downwards to nearly the ionization peak in the antisolar region are also observed which are associated with regions of strong radial magnetic fields. The ionopause is a highly dynamic and complex surface, extending from an average altitude of 290 km at the subsolar point to about 1000 km at the terminator and from 200 to over 3000 km on the nightside. A variety of solar wind interaction products are observed in the mantle, a transition region between the ionospheric plasma and the flowing shocked solar wind.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Nature; 296; Mar. 4
    Format: text
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  • 9
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    Report from ionospheric science (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The general strategy to advance knowledge of the ionospheric component of the solar terrestrial system should consist of a three pronged attack on the problem. Ionospheric models should be refined by utilization of existing and new data bases. The data generated in the future should emphasize spatial and temporal gradients and their relation to other events in the solar terrestrial system. In parallel with the improvement in modeling, it will be necessary to initiate a program of advanced instrument development. In particular, emphasis should be placed on the area of improved imaging techniques. The third general activity to be supported should be active experiments related to a better understanding of the basic physics of interactions occurring in the ionospheric environment. These strategies are briefly discussed.
    Keywords: GEOPHYSICS
    Type: Solar-Terrestrial Science Strategy Workshop; p 15-23
    Format: application/pdf
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  • 10
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    Report from upper atmospheric science (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Most of the understanding of the thermosphere resulted from the analysis of data accrued through the Atmosphere Explorer satellites, the Dynamics Explorer 2 satellite, and observations from rockets, balloons, and ground based instruments. However, new questions were posed by the data that have not yet been answered. The mesosphere and lower thermosphere have been less thoroughly studied because of the difficulty of accessibility on a global scale, and many rather fundamental characteristics of these regions are not well understood. A wide variety of measurement platforms can be used to implement various parts of a measurement strategy, but the major thrusts of the International Solar Terrestrial Physics Program would require Explorer-class missions. A remote sensing mission to explore the mesosphere and lower thermosphere and one and two Explorer-type spacecraft to enable a mission into the thermosphere itself would provide the essential components of a productive program of exploration of this important region of the upper atomsphere. Theoretical mission options are explored.
    Keywords: GEOPHYSICS
    Type: NASA, Marshall Space Flight Center, Solar-Terrestrial Science Strategy Workshop; p 9-13
    Format: application/pdf
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