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  • 1
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    Evidence for Day-to-Night Ion Transport at Low Solar Activity in the Venus Pre-Dawn Ionosphere (1993)
    In:  CASI
    Details
    Publication Date: 2019-08-16
    Description: Periapsis of the Pioneer Venus spacecraft dropped below 180 km on August 28, 1992 near midnight, and 42 orbits of low altitude data at moderately low solar activity in the pre-dawn sector were obtained before contact was lost to the spacecraft in October, 1992. Through a combination of analysis of data from the PV orbiter ion mass spectrometer (OIMS) and modeling, we consider here what can be learned about the relative importance of plasma transport from the dayside and electron precipitation in maintaining the nightside ionosphere during the re-entry period. In particular, we examine here the atomic ion density profiles. We compute the average peak density of O(+) as a function of solar zenith angle and determine what fluxes of atomic ions or precipitating electrons would be necessary to produce those values. We then compare model calculations of the ion densities to those observed during the re-entry period. We find that the low solar activity nightside ionosphere shows evidence of significant day-to-night plasma transport.
    Keywords: Lunar and Planetary Exploration
    Type: Paper 93GL02422 , Geophysical Research Letters. Selected Papers on Pioneer Venus Orbiter: Entry Phase; 20; 23; 2739-2742; NASA-TM-112700
    Format: text
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  • 2
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    Hydrocarbon Ions in the Ionospheres of Titan and Jupiter (1995)
    In:  CASI
    Details
    Publication Date: 2019-08-17
    Description: Two examples are given of models of ion chemistry in reducing atmospheres: Titan, which is a satellite of Saturn, and Jupiter, the largest of the gas giants. In both ionospheres, layers of hydrocarbon and/or C, H, and N-containing ions have been predicted to appear, with larger ions dominating at lower altitudes. Altitude profiles are presented for individual C1- and C2-hydrocarbon ions and larger ions that are represented for example, as C(x)H(y)(+) and C(x)H(y)N(x)(+). The accuracy of the predictions is, however, limited by the availability of information about the chemistry of these ions. In addition to rate coefficients and product channels for ion-molecule reactions, dissociative recombination coefficients and branching ratios are needed for many hydrocarbon and and related ions.
    Keywords: Lunar and Planetary Exploration
    Type: NASA-CR-200265 , NAS 1.26:200265
    Format: application/pdf
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  • 3
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    Studies of Excited Species in Planetary Upper Atmospheres (1999)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: During the period of this portion of the on-going project, we investigated aspects of the upper atmospheres of Venus, Mars, Titan and Jupiter. During this period, we published four journal articles and one book chapter, copies of which are attached. The work reported in these manuscripts was in almost all cases begun under previous projects in the Planetary Atmospheres Program with the same title. I will summarize the papers, and another project that we worked on during this time period for which the papers will be published later.
    Keywords: Lunar and Planetary Exploration
    Format: text
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  • 4
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    Evidence for Day-to-Night Ion Transport at Low Solar Activity in the Venus Pre-Dawn Ionosphere (1993)
    In:  CASI
    Details
    Publication Date: 2019-08-15
    Description: Periapsis of the Pioneer Venus spacecraft 2 dropped below 180 km on August 28, 1992 near midnight, and 42 orbits of low altitude data at moderately low solar activity in the pre-dawn sector were obtained before contact was lost to the spacecraft in October, 1992. Through a combination of analysis of data from the PV orbiter ion mass spectrometer (OIMS) and modeling, we consider here what can be learned about the relative importance of plasma transport from the dayside and electron precipitation in maintaining the nightside ionosphere during the re-entry period. In particular, we examine here the atomic ion density profiles. We compute the average peak density of O(+) as a function of solar zenith angle and determine what fluxes of atomic ions or precipitating electrons would he necessary to produce those values. We then compare model calculations of the ion densities to those observed during the re-entry period. We find that the low solar activity nightside ionosphere shows evidence of significant day-to-night plasma transport.
    Keywords: Lunar and Planetary Exploration
    Type: NASA-CR-204705 , NAS 1.26:204705 , Paper-93GL02422 , Geophysical Research Letters (ISSN 0094-8534); 20; 23; 2739-2742
    Format: text
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