P (Space and Planetary Sciences ) » P-EM Solar-Terrestrial Sciences, Space Electromagnetism & Space Environment
[P-EM21] Surprises from the Subauroral Zone: Synthesizing Ground and Space-Based Observations and Theory
Recent studies, including some facilitated by citizen science, have shown the subauroral ionosphere to be more active than previously suspected. Unusual emissions, from SAR arcs to STEVE, indicate previously little studied physical processes in this region. Some arise from conjugacy to the radiation belts, while others have origins which remain unclear. This session attempts to stimulate synthesis of observations from different domains to address phenomena which appear difficult to explain when examined from only one of the many new sources of information about the subauroral zone. Optical observations have expanded to include those with the very high resolution of amateur DSLR cameras, yet this sporadic source is well complemented by continuous observation from the few comprehensive subauroral observatories. As ever, conjugacy with spacecraft plays an important role in assessing possible sources of precipitation or waves that may stimulate the subauroral ionosphere, and there are indeed now many space assets (RBSP, Arase, THEMIS, MMS) with footprints at least sometimes in that region. Various polar-orbiting low-altitude satellites traverse it regularly. The installation of low-latitude poleward-looking incoherent scatter radars, with large fields of view in the subauroral zone, also provides context and the ability to extract physical parameters continuously. The sometimes-extreme conditions now known to exist in the subauroral region have stimulated theory to expand the parameter range needed to explain ionospheric phenomena. We welcome contributions integrating multiple sources of observation and theoretical approaches to hopefully transform what is initially surprising into a new view of an unsuspectedly active region.
*Shin-ichiro Oyama1,2,3, Atsuki Shinbori1, Anita Aikio2, Heikki Vanhamaki2, Yasunobu Ogawa3, Mirjam Kellinsalmi4, Tero Raita2, Mike Rietveld5, Kazuo Shiokawa1, Ilkka Virtanen2, Lei Cai6, Abiyot Workayehu2, Marcus Pedersen2, Kirsti Kauristie4, Boris Kozelov7, Andrei Demekhov7 (1.Institute for Space-Earth Environmental Research, Nagoya University, Japan, 2.Space Physics and Astronomy Research Unit, University of Oulu, Finland, 3.National Institute of Polar Research, Japan, 4.Finnish Meteorological Institute, Finland, 5.EISCAT, Norway, 6.KTH Royal Institute of Technology, Sweden, 7.Polar Geophysical Institute, Russia)
*Yudai Inaba1, Kazuo Shiokawa1, Shin-ichiro Oyama1,9,10, Yuichi Otsuka1, Atsuki Shinbori1, Yoshizumi Miyoshi1, Yoichi Kazama2, Shiang-Yu Wang2, Sunny W.T. Tam3, Tzu-Fang Chang3, Bo-Jhou Wang2, Kazushi Asamura4, Shoichiro Yokota5, Satoshi Kasahara6, Kunihiro Keika6, Tomoaki Hori1, Ayako Matsuoka4, Yoshiya Kasahara7, Atsushi Kumamoto8, Shoya Matsuda4, Yasumasa Kasaba8, Masafumi Shoji1, Iku Shinohara4 (1.Institute for Space-Earth Environmental Research, 2.Academia Sinica Institute of Astronomy and Astrophysics, Taipei, Taiwan, 3. Institute of Space and Plasma Sciences, National Cheng Kung University, Tainan, Taiwan, 4.JAXA, 5.Osaka Univ., 6.Univ. Tokyo, 7.Kanazawa Univ., 8.Tohoku Univ., 9.Univ. of Oulu, Finland, 10.National Institute of Polar Research)
*Claudia Martinez Calderon1, Jyrki Manninen2, Tauno Turunen2 (1.Institute for Space-Earth Environmental Research, Nagoya University, 2.Sodankylä Geophysical Observatory, University of Oulu, Sodankylä)