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2019
T. Sori, Shinbori, A., Otsuka, Y., Tsugawa, T., and Nishioka, M., “Characteristics of GNSS total electron content enhancements over the mid‐latitudes during a geomagnetic storm on November 7 and 8, 2004”, Journal of Geophysical Research: Space Physics, 2019.
2015
S. M. Buhari, Abdullah, M., Yokoyama, T., Hasbi, A. M., Otsuka, Y., Nishioka, M., Bahari, S. A., and Tsugawa, T., “Climatology of equatorial plasma bubble observed by MyRTKnet over the years 2008–2013”, in 2015 International Conference on Space Science and Communication (IconSpace)2015 International Conference on Space Science and Communication (IconSpace), Langkawi, Malaysia, 2015.
2014
S. M. Buhari, Abdullah, M., Hasbi, A. M., Otsuka, Y., Yokoyama, T., Nishioka, M., and Tsugawa, T., “Continuous generation and two-dimensional structure of equatorial plasma bubbles observed by high-density GPS receivers in Southeast Asia”, Journal of Geophysical Research: Space Physics, vol. 119, no. 12, pp. 10,569 - 10,580, 2014.
2007
T. Tsugawa, Zhang, S. - R., Coster, A. J., Otsuka, Y., Sato, J., Saito, A., Zhang, Y., and Paxton, L. J., “Summer-winter hemispheric asymmetry of the sudden increase in ionospheric total electron content and of the O/N 2 ratio: Solar activity dependence”, Journal of Geophysical Research, vol. 112, no. A8, 2007.