Aurorae: Their Characters and Spectra by J. Rand Capron is a comprehensive scientific treatise exploring the fascinating natural phenomenon of aurorae, commonly known as the Northern and Southern Lights. Drawing from meticulous observations and experiments conducted in the late 19th century, Capron delves into the physical characteristics, visual appearances, and spectral properties of auroral displays. The book provides detailed descriptions of auroral forms, colors, and movements, supported by numerous illustrations and diagrams. Capron discusses the scientific theories of his time regarding the origin and causes of aurorae, including their relationship to solar activity, magnetic storms, and atmospheric electricity. Special emphasis is placed on the spectral analysis of auroral light, with the author presenting his own observations and comparing them to those of other researchers. The work also includes accounts of notable auroral events, practical advice for amateur observers, and a review of the historical literature on the subject. Aurorae: Their Characters and Spectra stands as a valuable resource for both scientists and general readers interested in atmospheric phenomena, offering a blend of rigorous scientific inquiry and accessible narrative that captures the wonder and complexity of the aurora.
