Periodic spacing between consecutive equatorial plasma bubbles

DOI Web Site Web Site 被引用文献13件
  • J. J. Makela
    Department of Electrical and Computer Engineering University of Illinois at Urbana‐Champaign Urbana Illinois USA
  • S. L. Vadas
    Colorado Research Associates, NorthWest Research Associates Boulder Colorado USA
  • R. Muryanto
    Department of Electrical and Computer Engineering University of Illinois at Urbana‐Champaign Urbana Illinois USA
  • T. Duly
    Department of Electrical and Computer Engineering University of Illinois at Urbana‐Champaign Urbana Illinois USA
  • G. Crowley
    Atmospheric and Space Technology Research Associates San Antonio Texas USA

書誌事項

公開日
2010-07
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1029/2010gl043968
公開者
American Geophysical Union (AGU)

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説明

<jats:p>We analyze three‐years of data collected by a field‐aligned airglow imaging system located at the Cerro Tololo Inter‐American Observatory near La Serena, Chile to determine the occurrence of equatorial plasma bubbles (EPBs). On 317 of the 552 predominately clear nights of observations, structure indicative of EPBs is present. On 123 of these nights, multiple EPBs with periodic spacings were recorded with 88 nights showing 3 or more consecutive bubbles. We suggest that the periodic spacing of EPBs could be related to the properties of an underlying seed mechanism, namely gravity waves (GWs). The distribution of spacings compares favorably to the spectrum of GW induced traveling ionospheric disturbances (TIDs) measured by Vadas and Crowley (2010) from a similar geographic latitude in the northern hemisphere. Furthermore, the distribution of spacings decreases from 2006 through 2009, tracking the corresponding decrease in the thermospheric neutral temperature, <jats:italic>T</jats:italic><jats:sub><jats:italic>n</jats:italic></jats:sub>. As <jats:italic>T</jats:italic><jats:sub><jats:italic>n</jats:italic></jats:sub> decreases, GWs with larger horizontal wavelengths have smaller initial amplitudes and cannot propagate as easily to EPB seeding altitudes. Thus, our observations are consistent with GW theory.</jats:p>

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