[P-EM28_29PM2] 磁気圏-電離圏結合

[PEM28-16] 立体視によるオーロラの高度測定

*片岡 龍峰¹、重松 界²、三好 由純²、宮原 ひろ子³、糸屋 覚⁴ (1.極地研、2.名古屋大学、3.武蔵野美術大学、4.日本科学技術振興財団)

キーワード：オーロラ, 地上光学観測, デジタル一眼レフカメラ

A new stereoscopic measurement technique is developed (Kataoka+2013) to obtain an all-sky altitude map of aurora using two ground-based digital single-lens reflex (DSLR) cameras. Two identical full-color all-sky cameras were set with an 8 km separation across the Chatanika area in Alaska (Poker Flat Research Range and Aurora Borealis Lodge) to find localized emission height with the maximum correlation of the apparent patterns in the localized pixels applying a method of the geographical coordinate transform. It is successfully estimated that a typical ray structure of discrete aurora shows the broad altitude distribution above 100 km, while a typical patchy structure of pulsating aurora shows the narrow altitude distribution of less than 100 km. Recent new findings about the time variation of the emission height and further new challenges of February/March 2014 will also be reported.Reference: Kataoka, R., Y. Miyoshi, K. Shigematsu, D. Hampton, Y. Mori, T. Kubo, A. Yamashita, M. Tanaka, T. Takahei, T. Nakai, H. Miyahara, and K. Shiokawa (2013), Stereoscopic determination of all-sky altitude map of aurora using two ground-based Nikon DSLR cameras, Ann. Geophys, 31, 1543-1548.