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  • 1
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    Water as a probe of star-forming regions (1982)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Preliminary calculations employing statistical equilibrium techniques were carried out to determine brightness temperatures of water transitions occurring in the submillimeter band. The interesting candidates appear to be the 325 GHz, 380 GHz, and 448 GHz transitions, they are compared with the 183 GHz and 380 GHz transitions observed in the Orion Kleinmann-Low nebula and the combined results seem to be consistent with H2 densities of 100,000 -1 million cm-3 and a water column density of approximately 10 to 18th power. This implies a relative abundance of approximately 0.00001 which means that water may be about one twentieth of CO. In addition, it was found that for the conditions of the Orion plateau source, the 448 GHz line is expected to be a mild maser.
    Keywords: ASTROPHYSICS
    Type: ESA The Sci. Importance of Submillimetre Observations; p 129-130
    Format: text
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  • 2
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    A search for 183 GHz emission from water in late-type stars (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A search was made for 183 GHz line emission from water vapor in the direction of twelve Mira and two semiregular variables. Upper limits to the emission are in the range of 2000 to 5000 Jy. It is estimated that thermal emission from the inner regions of late type stellar envelopes will be on the order of ten Jy. Maser emission, according to one model, would be an order of magnitude stronger. From the limited set sampled, the possibility of very strong maser emission at 183 GHz cannot yet be ruled out.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 286; 310-313
    Format: text
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  • 3
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    Observations of interstellar H2O emission at 183 gigahertz (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Observations of the 183-GHz rotational transition of water vapor in interstellar molecular clouds are reported. The observations were made with a portable double-sideband superheterodyne radiometer used with the 91-cm Cassegrain telescope on board the Kuiper Airborne Observatory. An emission feature was detected in the direction of the Kleinmann-Low nebula in Orion with a peak antenna temperature of 15 K, a local standard of rest velocity of 8 km/sec, and a width of 15 km/sec. A plateau component of the emission profile is attributed to the 1-arcmin region characteristic of plateau emission from other observed molecules, with emission enhanced over that expected for thermal excitation, while the spike component observed is consistent with an optically thick source of the size of the molecular ridge in Orion at a temperature of 50 K and a column density greater than or equal to 3 x 10 to the 17th/sq cm, implying that H2O is one of the more abundant species in the Orion Molecular Cloud. Emission at 183 GHz was not detected in Sgr A, Sgr B2, W3, W43, W49, W51, DR 21, NGC 1333, NGC 7027, GL 2591 or the Rho Oph cloud; it may have been detected in M 17.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 235
    Format: text
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  • 4
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    Shock enhancement of HCO/+/ (1980)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: In the shocked gas associated with the supernova remnant IC 443, it is found that the HCO(+)/CO abundance is approximately 0.004. This is about 100 times greater than in the unshocked gas in this source where the ratio is typical of molecular clouds. This increase contradicts some current models for shock chemistry which predict a decrease of HCO(+) behind shock fronts.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 237
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  • 5
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    Upstream waves and particles - An overview of ISEE results (1981)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: A brief survey is presented of papers given at the Upstream Wave and Particle Workshop held at the Jet Propulsion Laboratory on April 15-16, 1980. Particular consideration is given to upstream energetic particles, upstream plasma waves, and acceleration processes. An attempt is made to view the solar wind-magnetosphere interaction as a general process and to state some of the obvious astrophysical implications.
    Keywords: GEOPHYSICS
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  • 6
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    Microinstabilities associated with a high Mach number, perpendicular bow shock (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Instability analyses incorporating insights gained through ISEE observations and hybrid simulations are used in an examination of the instabilities associated with a high Mach number perpendicular shock akin to the earth's bow shock. In the regions in front of, and at, the shock transition the cross-field instabilities are subdivided into the ion-ion streaming, kinetic cross-field streaming, and drift lower hybrid instability low frequency modes, as well as the electron cyclotron drift, ion sound, and electron whisker instability high frequency modes. Further downstream, ion ring-like and anisotropy-driven instabilities are considered. The implications of these results for wave signatures, plasma heating and acceleration are noted.
    Keywords: GEOPHYSICS
    Type: Space Science Reviews (ISSN 0038-6308); 37; 63-109
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