Caption: The aurora give rise to emission line spectra. Here is a typical aurora line spectrum compared to the solar spectrum NOT dispersed enough to show the Fraunhofer lines---or maybe they have been erased for clarity. The visible band (fiducial range 0.4--0.7 μm = 4000--7000 Å) with wavelength in angstroms (1 Å = 10**(-10) m).
The displayed aurora line spectrum analyzed:
See also See Earth aurora videos below (local link / general link: earth_aurora_videos.html):
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Credit/Permission:
National Oceanic and Atmospheric Administration (NOAA),
before or circa 2003 /
Public domain.EOF
Download site: NOAA:
Image ID: wea01029, Historic NWS Collection;
Source: Collection of Dr. Herbert Kroehl, NGDC.
Alas, a dead link.
Image link: Itself.
File: Earth atmosphere file:
noaa_aurora_line_spectrum.html.