Cellular structures in the high-latitude thermosphere

Crowley, G; Schoendorf, J; Roble, R G

doi:10.1029/95JA02584

Title: Cellular structures in the high-latitude thermosphere

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Abstract

An organized density (and pressure) structure was recently discovered in the neutral thermosphere at high-latitudes. The structure consists of two to four high- and low-density regions having diameters of 1000 to 2000 km. The density in each region is enhanced or depleted from the hemispheric average by up to 30%. The structure is thus a significant feature of the near-Earth space environment at high-latitudes. The authors refer to each distinct region of enhanced or depleted density as a density {open_quotes}cell.{close_quotes} The cells extend upward from about 120 km into the upper thermosphere, and once formed they remain approximately fixed with respect to the geomagnetic pole. A parametric study of the density cell morphology for different magnetic activity levels is described for equinox solar minimum using the National Center for Atmospheric Research thermosphere ionosphere general circulation model (NCAR model). The TIGCM simulations were used to predict the large density perturbations observed by the S85-1 satellite in a circular sun-synchronous orbit near 200 km altitudes. The most obvious manifestations of the cells was the presence of density peaks located near 70{degrees}{Lambda} on the dayside and nightside, and a density minimum near the magnetic pole. Since high-latitude densities are generally expected to increasemore »« less

Authors:

Crowley, G ^[1]; Schoendorf, J; Roble, R G ^[2]

Johns Hopkins Univ. Laurel, MD (United States)
NCAR, Boulder, CO (United States); and others

Publication Date:: Mon Jan 01 00:00:00 EST 1996

OSTI Identifier:: 254442

Resource Type:: Journal Article

Journal Name:: Journal of Geophysical Research

Additional Journal Information:: Journal Volume: 101; Journal Issue: A1; Other Information: PBD: 1 Jan 1996

Country of Publication:: United States

Language:: English

Subject:: 66 PHYSICS; THERMOSPHERE; BUBBLES; COUPLING; DENSITY; IONOSPHERE; POLAR REGIONS

Citation Formats


                    Crowley, G, Schoendorf, J, and Roble, R G. Cellular structures in the high-latitude thermosphere.  United States: N. p., 1996. 
        Web.  doi:10.1029/95JA02584.

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                    Crowley, G, Schoendorf, J, & Roble, R G. Cellular structures in the high-latitude thermosphere.  United States.  https://doi.org/10.1029/95JA02584

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                    Crowley, G, Schoendorf, J, and Roble, R G. 1996.  
        "Cellular structures in the high-latitude thermosphere".  United States.  https://doi.org/10.1029/95JA02584.

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@article{osti_254442,

  title        = {Cellular structures in the high-latitude thermosphere},

  author       = {Crowley, G and Schoendorf, J and Roble, R G},

  abstractNote = {An organized density (and pressure) structure was recently discovered in the neutral thermosphere at high-latitudes. The structure consists of two to four high- and low-density regions having diameters of 1000 to 2000 km. The density in each region is enhanced or depleted from the hemispheric average by up to 30%. The structure is thus a significant feature of the near-Earth space environment at high-latitudes. The authors refer to each distinct region of enhanced or depleted density as a density {open_quotes}cell.{close_quotes} The cells extend upward from about 120 km into the upper thermosphere, and once formed they remain approximately fixed with respect to the geomagnetic pole. A parametric study of the density cell morphology for different magnetic activity levels is described for equinox solar minimum using the National Center for Atmospheric Research thermosphere ionosphere general circulation model (NCAR model). The TIGCM simulations were used to predict the large density perturbations observed by the S85-1 satellite in a circular sun-synchronous orbit near 200 km altitudes. The most obvious manifestations of the cells was the presence of density peaks located near 70{degrees}{Lambda} on the dayside and nightside, and a density minimum near the magnetic pole. Since high-latitude densities are generally expected to increase during magnetic activity, the low densities over the pole are perhaps the most interesting feature of the cell structure discussed here. The satellite data confirm the existence of the cellular structure over a range of magnetic activity levels. The discovery of the cells is important because the structure provides a unifying framework for the analysis and interpretation of high-latitude data from both past and future experiments. The cells result from various forms of coupling between the ionosphere and thermosphere. The cell formation is quantitatively consistent with concepts from dynamic meteorology. 34 refs., 11 figs.},

  doi          = {10.1029/95JA02584},

  url          = {https://www.osti.gov/biblio/254442},
  journal      = {Journal of Geophysical Research},
number       = A1,

  volume       = 101,

  place        = {United States},

  year         = {Mon Jan 01 00:00:00 EST 1996},

  month        = {Mon Jan 01 00:00:00 EST 1996}

}

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