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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 29, issue 5
Ann. Geophys., 29, 749–757, 2011
https://doi.org/10.5194/angeo-29-749-2011
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 29, 749–757, 2011
https://doi.org/10.5194/angeo-29-749-2011
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.

  05 May 2011

05 May 2011

Airglow observations over the equatorial ionization anomaly zone in Taiwan

J. Y. Liu1,2, P. K. Rajesh1, I. T. Lee1, and T. C. Chow3 J. Y. Liu et al.
  • 1Institute of Space Science, National Central University, Chung-Li 32001, Taiwan
  • 2Center for Space and Remote Sensing Research, National Central University, Chung-Li 32001, Taiwan
  • 3Department of Physics, National Sun Yat Sen University, Kaohsiung 80424, Taiwan

Abstract. Airglow imaging at mid-latitude stations often show intensity modulations associated with medium scale travelling ionospheric disturbances (MSTID), while those carried out near the equatorial regions reveal depletions caused by equatorial plasma bubbles (EPB). Two all sky cameras are used to observe plasma depletions in the 630.0 nm emission over the equatorial ionization anomaly (EIA) region, Taiwan (23° N, 121° E; 13.5° N Magnetic) during 1998–2002 and 2006–2007. The results show EPB and MSTID depletions in different solar activity conditions. Several new features of the EPB depletions such as bifurcation, secondary structure on the walls, westward tilt, etc., are discussed in this paper. Evidence of tilted depletions with secondary structures developing on the eastern wall that later evolve to appear as bifurcations, are presented for the first time. Moreover, detail investigations are carried out using International Reference Ionosphere (IRI) model as well as the electron density from Ionosonde and Global Positioning System (GPS) Occultation Experiment (GOX) onboard FORMOSAT-3/COSMIC satellite, to understand the conditions that favor the propagation of MSTID to the latitude of Taiwan.

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