Ionospheirc Scintillation

Solar-Terrestrial Environment Laboratory of Nagoya University developed a observation system that consists of three closely spaced GPS receivers which measure ionospheric scintillation of the 1.575 GHz signal. Ionospheric plasma drift velocity can be determined through this system. In this homepage, plots of S4-index obtained with the three GPS receivers are shown.

S4-index Data Viewer

2003 2004 2005 2006 2007 2008 2009 2010 2011 2012
2013 2014 2015 2016 2017 2018 2019 2020

Location of the GPS receivers

The GPS receivers are installed at the Equatorial Atmosphere Radar (EAR) site of Kyoto University. The EAR is located at the geographic equator in West Sumatra, Indonesia (0.20S, 100.32$E; geomagnetic latitude 10.6S).

Contact Address

Dr. Yuichi Otsuka and Professor Tadahiko Ogawa
Solar-Terrestrial Environment Laboratory, Nagoya University
3-13, Honohara, Toyokawa, Aichi 442-8507, Japan
tel: 81-533-89-5168 fax: 81-533-89-1539
e-mail: otsuka @ or ogawa @


We thank Y. Katoh, M. Satoh, and T. Katoh of the Solar-Terrestrial Environment Laboratory, Nagoya University, and LAPAN staff at the EAR site for their kind support of the GPS observations. This work is supported by Grant-in-Aid for Scientific Research (11440145, 13573006) and on Priority Area (764) of the Ministry of Education, Culture, Sports, Science and Technology of Japan.