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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 23, issue 2
Ann. Geophys., 23, 379–384, 2005
https://doi.org/10.5194/angeo-23-379-2005
© Author(s) 2005. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 23, 379–384, 2005
https://doi.org/10.5194/angeo-23-379-2005
© Author(s) 2005. This work is distributed under
the Creative Commons Attribution 3.0 License.

  28 Feb 2005

28 Feb 2005

The climatology of ionospheric plasma bubbles and irregularities over Brazil

F. D. Chu1,2, J. Y. Liu1,3, H. Takahashi4, J. H. A. Sobral4, M. J. Taylor5, and A. F. Medeiros6 F. D. Chu et al.
  • 1Institute of Space Science, National Central University, Taiwan
  • 2National Standard Time and Frequency Laboratory, Telecommunication Laboratories, Chunghwa Telecom Co. Ltd., Taiwan
  • 3Center for Space and Remote Sensing Research, National Central University, Taiwan
  • 4Instituto Nacional de Pesquisas Espaciais-NIPE, São José dos Campos, SP, Brazil
  • 5Space Dynamics Laboratory and Physics Department, Utah State University, USA
  • 6Departamento de Física, Universidade Federal de Campina Grande, Campina Grande, Brazil

Abstract. In this paper, we examine ionospheric plasma depletions (or bubbles) and irregularities observed by photometers and a ground-based receiver of the global positioning system (GPS) both located in Brazil, South America. A simultaneous observation reveals that when the ionospheric plasma becomes depleted, the GPS total electron content decreases and the associated phase fluctuations grow. Statistical results show that the plasma bubbles and the significant GPS phase fluctuations generally occur during October-March. The solar activity variation is not obvious in either observation except during the equinoctial months. The GPS phase fluctuations suggest that the most pronounced ionospheric irregularities appear between 20:00 and 01:00 LT, which generally agree with previous ionospheric bubble observations.

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