Long-term variation of geomagnetic Sq filed and its cause

Masahiko Takeda

Presentation information

[JJ] Oral

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

[P-EM22] [JJ] Physics and Chemistry in the Atmosphere and Ionosphere

Thu. May 25, 2017 10:45 AM - 12:15 PM A02 (Tokyo Bay Makuhari Hall)

convener:Yuichi Otsuka(Institute for Space-Earth Environmental Research, Nagoya University), Takuya Tsugawa(National Institute of Information and Communications Technology), Seiji Kawamura(National Institute of Information and Communications Technology), Chairperson:Hiroyo Ohya(Graduate School of Engineering, Chiba University), Chairperson:Michi Nishioka(National Institute of Information and Communications Technology)

11:30 AM - 11:45 AM

[PEM22-04] Long-term variation of geomagnetic Sq filed and its cause

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

Keywords:geomagnetic daily variation, long term variation, solar activity, pressure difference in the thermosphere, electric conductivity, geomagnetic main field strength

Long-term variation of geomagnetic Sq field was used to study that of neutral pressure difference of the thermosphere (PD), considering high correlation between Ampere force by geomagnetic Sq currents and PD. It was shown that long term variation of PD can be explained almost only solar activity variation. Other factors such as eletric conductivity and geomagnetic main filed will be considered in the presentation.