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    Titan's atmosphere simulation experiment using continuum UV-VUV synchrotron radiation (2013)
    Wiley-Blackwell
    Details
    Publication Date: 2013-02-23
    Description: [1]  A new reactor, named APSIS for Atmospheric Photochemistry SImulated by Synchrotron, is designed for simulating the reactivity occurring in planetary upper atmospheres. In this reactor, a gas mixture roughly reproducing the main Titan's atmosphere composition (N 2 /CH 4  = 90/10) is irradiated by a continuous-spectrum in the 60−350 nm range, provided by the DISCO beamline at SOLEIL synchrotron radiation facility. This spectral range enables the dissociation and ionization of N 2 and CH 4 , as observed in plasma reactors and Titan's ionosphere. The neutral products are detected in situ by quadrupole mass spectrometry, and collected with a cryogenic trap for ex-situ analysis by gas chromatography-mass spectrometry. The detected reaction products include C2, C3, C4 and probably C5 organic compounds, with important amounts of nitrogen-bearing species: HCN, CH 3 CN and C 2 N 2 . Neutral mass spectra obtained with APSIS are compared with INMS experiments of the Cassini space probe in the upper Titan atmosphere and with other results of current Titan atmosphere chemistry laboratory simulations.
    Print ISSN: 0148-0227
    Topics: Geosciences , Physics
    Published by Wiley-Blackwell on behalf of American Geophysical Union (AGU).
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    Equatorial E-Region Electric Fields and Sporadic E Layer Responses to the Recovery Phase of the November 2004 Geomagnetic Storm (2017)
    Wiley-Blackwell
    Details
    Publication Date: 2017-12-05
    Description: Equatorial E-region Electric Fields (EEF) inferred from coherent radar data, sporadic-E (Es) layers observed from a digital ionosonde data, and modeling results are used to study the responses of the equatorial E region over São Luís (SLZ, 2.3° S, 44.2° W, ~ -7° dip angle), Brazil, during the super storm of November 2004. The EEF is presented in terms of the zonal ( E y ) and vertical ( E z ) components in order to analyze the corresponding characteristics of different types of Es seen in ionograms, and simulated with the MIRE (Portuguese acronym for E region Ionospheric Model) model. We bring out the variabilities of E y and E z components with storm-time changes in the equatorial E-region. In addition, some aspects of the electric fields and Es behavior in three cases of weak, very weak and strong Type II occurrences during the recovery phase of the geomagnetic storm are discussed. The connection between the enhanced occurrence and suppressions of the Type II irregularities and the q-type Es (Es q ) controlled by electric fields, with the development or disruption of the blanketing sporadic E (Es b ) layers produced by wind shear mechanism, is also presented. The mutual presence of Es q along with the Es b occurrences is a clear indicator of the secular drift of the magnetic equator and hence that of the Equatorial Electrojet (EEJ) over SLZ. The results show evidence about the EEJ and Es layers electrodynamics and coupling during geomagnetic disturbance time electric fields.
    Print ISSN: 0148-0227
    Topics: Geosciences , Physics
    Published by Wiley-Blackwell on behalf of American Geophysical Union (AGU).
    Location Call Number Limitation Availability
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    PAPER CURRENT
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