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Article Number - 81CDF5D55935


Vol.13(2), pp. 8-15 , January 2018
https://doi.org/10.5897/IJPS2017.4703
ISSN: 1992-1950


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Full Length Research Paper

High-latitude thermospheric zonal winds during low solar activity period



Sivla W. T.
  • Sivla W. T.
  • Department of Physics and Astronomy, University of Nigeria, Nsukka, Enugu State, Nigeria.
  • Google Scholar
Ugonabo O. J.
  • Ugonabo O. J.
  • Department of Physics and Astronomy, University of Nigeria, Nsukka, Enugu State, Nigeria.
  • Google Scholar
Okoro E. C.
  • Okoro E. C.
  • Department of Physics and Astronomy, University of Nigeria, Nsukka, Enugu State, Nigeria.
  • Google Scholar







 Received: 02 December 2017  Accepted: 18 January 2018  Published: 30 January 2018

Copyright © 2018 Author(s) retain the copyright of this article.
This article is published under the terms of the Creative Commons Attribution License 4.0


Changes resulting from the cyclical nature of the sun’s energy output result to variations in thermosphere-ionosphere system parameters. The prolonged low solar activity period of solar cycle 23 provides an opportunity to study the thermosphere-ionosphere system parameters when the sun was at its ground state. The CHAMP satellite has provided wind data that can be used for investigation of neutral thermospheric parameters such as zonal winds and density. Using zonal wind data from 2006 to 2008 generated from CHAMP accelerometer readings using an iterative algorithm, the diurnal variation of averaged zonal thermospheric winds in the high latitudes (70 - 80°N) has been investigated. In the analysis we grouped the data into four seasons; the March and September equinoxes, and the June and December solstices. The wind data is binned into local time bins and averaged to find the hourly mean speeds. The results reveal maximum eastward and westward wind speeds going above 150 m/s for each of the seasons considered. Of particular interest is the observation that despite the expected complex behavior resulting from the expected magnetospheric inputs, the diurnal patterns are similar to those obtained in the mid-latitudes in an earlier study with data from this algorithm. Due to likely errors arising from the longitudinal effects of mixing composite solar times, there is need for simultaneous measurements in the high latitudes.

Key words: CHAMP satellite, high latitude, solar activity, thermosphere.

 

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APA Sivla, W. T., Ugonabo, O. J., & Okoro, E. C. (2018). High-latitude thermospheric zonal winds during low solar activity period. International Journal of Physical Sciences, 13(2), 8-15.
Chicago Sivla W. T., Ugonabo O. J. and Okoro E. C.  . "High-latitude thermospheric zonal winds during low solar activity period." International Journal of Physical Sciences 13, no. 2 (2018): 8-15.
MLA Sivla W. T., Ugonabo O. J. and Okoro E. C.  . "High-latitude thermospheric zonal winds during low solar activity period." International Journal of Physical Sciences 13.2 (2018): 8-15.
   
DOI https://doi.org/10.5897/IJPS2017.4703
URL http://academicjournals.org/journal/IJPS/article-abstract/81CDF5D55935

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