Japan Geoscience Union Meeting 2021

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

[P-EM12] Dynamics of the Inner Magnetospheric System

Sat. Jun 5, 2021 5:15 PM - 6:30 PM Ch.04

convener:Kunihiro Keika(Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo), Yoshizumi Miyoshi(Institute for Space-Earth Environmental Research, Nagoya University), W Lauren Blum(University of Colorado Boulder), Yuri Shprits(Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences)

5:15 PM - 6:30 PM

[PEM12-P18] Altitude profile of isolated proton aurora as estimated from digital camera observations from International Space Station

*Kazuteru Takahashi1, Sota Nanjo2, Yuta Hozumi2, Keisuke Hosokawa2, Yoshizumi Miyoshi1 (1.Institute for Space–Earth Environmental Research, 2.The University of Electro-Communications)

Keywords:Isolated proton aurora, International Space Station

Proton aurora, that appears as an isolated spot at sub-auroral latitudes well away from the electron auroral oval, is called as the “Isolated Proton Aurora” (IPA). It has been believed that proton precipitation responsible for IPA is caused by scattering of protons through interaction with Electromagnetic Ion Cyclotron (EMIC) waves in the magnetosphere. It is well known that IPA appears in a horizontally (i.e., latitudinal and longitudinal directions) localized region. However, its spatial structure in the vertical direction has not been well understood. Therefore, we employ the full-color aurora images captured by the digital camera onboard the “International Space Station” (ISS) for deriving the altitude profile of emission of IPA. The digital camera onboard ISS is able to carry out limb viewing observations of the upper atmosphere of the Earth which allows us to capture the vertical structure of aurora, especially IPA. Nanjo et al. (2020) showed that it is possible to map the horizontal structure of aurora with high spatial/temporal resolutions. Thus far, however, The vertical structure of auroras has not been derived with the photographs captured from the ISS; thus, the details of the height structure of IPA are still unknown. In this study, we developed a method for mapping the vertical profile of the emission of IPA using limb-viewing digital camera images from ISS. In this presentation, we will discuss how the altitude profiles of the red and green emissions of IPA are distributed based on the mapping results of the altitude structure of the IPA observed in the southern hemisphere on April 20, 2018.