Publications related to the GRACE Missions (no abstracts)

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High-Latitude Neutral Density Structures Investigated by Utilizing Multi-Instrument Satellite Data and NRLMSISE-00 Simulations

Horvath, Ildiko and Lovell, Brian C., 2018. High-Latitude Neutral Density Structures Investigated by Utilizing Multi-Instrument Satellite Data and NRLMSISE-00 Simulations. Journal of Geophysical Research (Space Physics), 123(2):1663–1677, doi:10.1002/2017JA024600.

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@ARTICLE{2018JGRA..123.1663H,
       author = {{Horvath}, Ildiko and {Lovell}, Brian C.},
        title = "{High-Latitude Neutral Density Structures Investigated by Utilizing Multi-Instrument Satellite Data and NRLMSISE-00 Simulations}",
      journal = {Journal of Geophysical Research (Space Physics)},
     keywords = {neutral density variation, neutral density spike, Joule heating, SS-FACs, flow channels, thermospheric composition},
         year = 2018,
        month = feb,
       volume = {123},
       number = {2},
        pages = {1663-1677},
     abstract = "{This study investigates various types of neutral density features
        developed in the cusp region during magnetically active and
        quiet times. Multi-instrument Challenging Minisatellite Payload
        data provide neutral density, electron temperature, neutral wind
        speed, and small-scale field-aligned current (SS-FAC) values.
        Gravity Recovery and Climate Experiment neutral density data are
        also employed. During active times, cusp densities or density
        spikes appeared with their underlying flow channels (FCs) and
        enhanced SS-FACs implying upwelling, fueled by Joule heating,
        within/above FCs. Both the moderate nightside cusp enhancements
        under disturbed conditions and the minor dayside cusp
        enhancements under quiet conditions developed without any
        underlying FC and enhanced SS-FACs implying the role of particle
        precipitation in their development. Observations demonstrate the
        relations of FCs, density spikes, and upwelling-related
        divergent flows and their connections to the underlying (1)
        dayside magnetopause reconnection depositing magnetospheric
        energy into the high-latitude region and (2) Joule heating-
        driven disturbance dynamo effects. Results provide observational
        evidence that the moderate nightside cusp enhancements and the
        minor dayside cusp enhancements detected developed due to direct
        heating by weak particle precipitation. Chemical compositions
        related to the dayside density spike and low cusp densities are
        modeled by Naval Research Laboratory Mass Spectrometer
        Incoherent Scatter Radar Extended 2000. Modeled composition
        outputs for the dayside density spike's plasma environment
        depict some characteristic upwelling signatures. Oppositely, in
        the case of low dayside cusp densities, composition outputs show
        opposite characteristics due to the absence of upwelling.}",
          doi = {10.1002/2017JA024600},
       adsurl = {https://ui.adsabs.harvard.edu/abs/2018JGRA..123.1663H},
      adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}

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