Japan Geoscience Union Meeting 2018

Presentation information

[JJ] Oral

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

[P-EM18] Physics and Chemistry in the Atmosphere and Ionosphere

Tue. May 22, 2018 3:30 PM - 5:00 PM 304 (3F International Conference Hall, Makuhari Messe)

convener:Yuichi Otsuka(Institute for Space-Earth Environmental Research, Nagoya University), Takuya Tsugawa(National Institute of Information and Communications Technology), Seiji Kawamura(国立研究開発法人 情報通信研究機構), Chairperson:Takahashi Toru(極地研究所), Tao Chihiro

4:30 PM - 4:45 PM

[PEM18-11] Study on the daily and seasonal variation of equatorial anomaly in Asia from satellite-ground beacon experiment

*Yuki Sakamoto1, Mamoru Yamamoto1, Kornyanat Hozumi2 (1.Research Institute for Sustainable Humanosphere, Kyoto University, 2.National Institute of Information and Communications Technology)

Keywords:Satellite-ground beacon experiment, Bias estimation, TEC, Equatorial anomaly

Studies of ionospheric structures by the satellite-ground beacon experiment were conducted mainly in southeast Asia. For example, meridional chain of five beacon receivers along 100E meridian showed meridional distribution of total-electron content (TEC) of the ionosphere, and we revealed time and spatial variabilities of the equatorial anomaly in a certain period time (Watthanasangmechai et al., 2014, 2015). The data analysis was, however, not easy mainly because of difficulty in estimating bias of the measurement to get the absolute TEC. First, in this study, we made the database of latitudinal TEC distribution. We developed automatic estimation of TEC by multi steps. First step is based on combining observations from two receivers. Then the results were processed through multi-point observation method. The results of this method were confirmed to be correct by the results by Watthanasangmechai et al. (2014, 2015). Using this method, we analyzed latitude distribution of TEC from Thai to Indonesia in 2012-2015. It is valuable to measure such latitudinal distribution of TEC in the wide latitudinal range from the ground fixed sites. Using these data, we show the daily and seasonal variation of the equatorial anomaly, which occurs in the low latitude areas in Asia.