Abstract
Abstract. A new stereoscopic measurement technique is developed 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 found 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. Because of its portability and low cost of the DSLR camera systems, the new technique may open a unique opportunity not only for scientists but also for night-sky photographers to complementarily attend the aurora science to potentially form a dense observation network.
Highlights
The purpose of this paper is to report the first results of the “altitude map” as obtained from the all-sky stereoscopic analysis
The altitude of the base window is determined by the assumed altitude of the highest normalized cross-correlation coefficient of the windows of PI1
The estimated altitude maps of the ray and patchy structure are reasonable as shown in Figs. 4–6, and are consistent with former observations and theories
Summary
The purpose of this paper is to report the first results of the “altitude map” as obtained from the all-sky stereoscopic analysis
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