JpGU-AGU Joint Meeting 2017

Presentation information

[EE] Oral

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

[P-EM15] [EE] Study of coupling processes in solar-terrestrial system

Thu. May 25, 2017 10:45 AM - 12:15 PM A03 (Tokyo Bay Makuhari Hall)

convener:Mamoru Yamamoto(Research Institute for Sustainable Humanosphere, Kyoto University), Yasunobu Ogawa(National Institute of Polar Research), Satonori Nozawa(Institute for Space-Earth Environment Research), Akimasa Yoshikawa(Department of Earth and Planetary Sciences, Kyushu University), Chairperson:Satonori Nozawa(Institute for Space-Earth Environment Research), Chairperson:Mamoru Yamamoto(Research Institute for Sustainable Humanosphere, Kyoto University)

11:00 AM - 11:15 AM

[PEM15-07] Magnetosphere-ionosphere-thermosphere-middle atmosphere coupling in the polar region

*Hitoshi Fujiwara1, Satonori Nozawa2, Yasunobu Ogawa3, Ryuho Kataoka3, Yasunobu Miyoshi4, Hidekatsu Jin5, Hiroyuki Shinagawa5, Huixin Liu4 (1.Faculty of Science and Technology, Seikei University, 2.ISEE, Nagoya University, 3.National Institute of Polar Research, 4.Department of Earth and Planetary Sciences, Faculty of Sciences, Kyushu University, 5.National Institute of Information and Comunications Technology)

Keywords:thermosphere, ionosphere, middle atmosphere, aurora, magnetosphere

Recently, many coupling processes between the magnetosphere, ionosphere, thermosphere,
and lower atmosphere have been shown from observations and numerical simulations. In
particular, it is known that some meteorological phenomena would have impacts on
the thermosphere and ionosphere; for example, typhoon and sudden stratospheric warming
events. The coupling between neutrals and plasmas is wellknown and important processes
to understand various ionospheric and thermospheric variations. When we understand
all the coupling processes between the regions, we would come close to realizing the
predictions of the ionospheric and thermospheric weathers.
In the present study, we focus our attention on the polar ionosphere and thermosphere
where various coupling processes would exist. Among the coupling processes, chemical
ones caused by the precipitating particles in the polar region seem to be far from
complete understandings for us. We have made observations of the dayside polar cap
ionosphere using the EISCAT radar system to monitor ionospheric disturbances due to
the particle and energy inputs from the magnetosphere. The polar cap ionospheric
disturbances in the higher latitude have been observed at almost all the time even
during geomagnetically quiet periods. We will show some fundamental features of the
polar cap ionosphere revealed from the EISCAT observations. In addition, we have
performed modelling studies to understand physics and chemistry of the polar ionosphere
and thermosphere. In the present study, we will introduce our attempt to estimate productions
of ions, NOx, and HOx in the altitude of 50-500 km due to precipitating particles.
The results from the EISCAT observations and modelling studies will be included
in our whole atmosphere and ionosphere GCM, GAIA, in the future.