Japan Geoscience Union Meeting 2016

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Symbol P (Space and Planetary Sciences) » P-EM Solar-Terrestrial Sciences, Space Electromagnetism & Space Environment

[P-EM16] Physics and Chemistry in the Atmosphere and Ionosphere

Tue. May 24, 2016 1:45 PM - 3:15 PM 106 (1F)

Convener:*Yuichi Otsuka(Solar-Terrestrial Environment Laboratory, Nagoya University), Takuya Tsugawa(National Institute of Information and Communications Technology), Seiji Kawamura(National Institute of Information and Communications Technology), Chair:Shin-ichiro Oyama(Institute for Space-Earth Environmental Research, Nagoya University), Tatsuhiro Yokoyama(National Institute of Information and Communications Technology)

2:45 PM - 3:00 PM

[PEM16-11] Variation of equivalent current system representing geomagnetic Sq variation in the period of 1980-2010

*Masahiko Takeda1 (1.Data Analysis Center for Geomagnetism and Space Magnetism, Graduate School of Science, Kyoto University)

Keywords:geomagnetic daily variation,, equivalent current system, secular variation, solar activity

Spherical harmonics analysis was performed for the geomagnetic Sq field from 1980 to 2010 for every universal hour on each day. Solar activity dependence of the total Sq currents was confirmed, and variation in each solar cycle was also reflected in the total current intensity.
More detailed features of the long trend of the Sq field will be discussed in the presentation.