Presentation Title:

“Plasma Structuring in the Polar Cap Ionosphere”

by

Keisuke Hosokawa

University of Electro-Communications, Tokyo, Japan

Time: 15:00-16:30, Mar. 07, 2016

Meeting Room: 208

Abstract:

We have been operating a highly sensitive all-sky EMCCD airglow imager in Longyearbyen, Norway since October 2011. The imager obtains the 630.0 nm all-sky images with an exposure time of 4 sec, which is about 10 times shorter than the conventional cooled CCD airglow imagers. This new equipment allows us to image the generation and structuring processes of polar cap patches in 2D fashion. I introduce two case examples in which patches were produced near the dayside cusp in a sequence of auroral transients (poleward moving auroral forms), and faint undulations appeared along the trailing edge of patches propagating in the central polar cap. These new observations are of particular importance in understanding/predicting the electron density perturbations affecting the trans-ionospheric satellite communications in the central polar cap.

Biography:

He got his Ph.D from Kyoto University, Kyoto Japan in 2003, and immediately after that he started working for the University of Electro-Communications in Tokyo. He have been working in the field of ground-based observations of various upper atmospheric phenomena in the high Arctic region. In particular, he have been operating two all-sky airglow imagers, one at Resolute Bay, Canada since January 2005, and the other in Longyearbyen, Norway since 2011. By using the data from these instruments, he have been studying dynamical characteristics of polar cap patches and polar cap aurorae.

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