Japan Geoscience Union Meeting 2019

Presentation information

[E] Poster

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

[P-EM10] Multi-scale Coupling in the Magnetosphere-Ionosphere-Thermosphere System

Mon. May 27, 2019 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall8, Makuhari Messe)

convener:Yue Deng(University of Texas at Arlington), Toshi Nishimura(Boston University), Huixin Liu(Earth and Planetary Science Division, Kyushu University SERC, Kyushu University), Yanshi Huang(Harbin Institute of Technology, Shenzhen)

[PEM10-P02] Comparison of precipitating particle energy of proton aurora at geomagnetic conjugate points

*Makoto Taguchi1, Tatsuki Nishijima1, Akira Kadokura2 (1.Rikkyo University, 2.Research Organization of Information and Systems)

It is expected that mirror images of aurora are observed at geomagnetic conjugate points in the northern and southern auroral zones connected by a geomagnetic field line. However, geomagnetic conjugate auroras often show non-conjugacy, which reflects north-south asymmetry of the solar wind, the magnetosphere and the ionospheres. In other words acceleration mechanism of auroral particles may be studied by comparing aurora simultaneously occurring at geomagnetic conjugate points. A hydrogen Balmer beta emission at the wavelength of 486.1 nm which is the brightest among the proton auroral lines was observed at a pair of geomagnetic conjugate points to compare precipitating particle energy. Two identical Proton Auroral Specrographs (PASs) which obtain auroral spectra along a geomagnetic meridian at a rate of 1 image/min were installed at Tjornes in Iceland and Syowa Station in Antarctica. Data obtained during a period from September 4, 2018 to October 9, 2018 were analyzed to derive an average kinetic energy of precipitating protons along a local geomagnetic field line from a Doppler shift of the H beta line. As a result we are succeeded in simultaneous observations of proton auroras at both conjugate points in 5 nights on September 4, 5, 6, 7 , and 10. The average energies of precipitating protons range from 0 keV to 7 keV, and sometimes show a periodical variation with a period of 4 - 5 min. Conjugacy of precipitating particle energy will be discussed in the presentation.