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Earth, Planets and Space
Fig. 2 | Earth, Planets and Space

Fig. 2

From: Evaluation of a method to derive ionospheric conductivities using two auroral emissions (428 and 630 nm) measured with a photometer at Tromsø (69.6°N)

Fig. 2

EISCAT and photometer results for October 10, 2002; a time–altitude profiles of electron density obtained with the EISCAT UHF radar from 18:00 UT to 23:30 UT on October 10, 2002. b Temporal variation of the emission intensity at 427.8 nm observed by the photometer. c Temporal variation of the average energy of the precipitating electrons derived from the emission intensity ratio of 427.8 to 630.0 nm from the photometer observations. d Temporal variation of the emission intensity at 630.0 nm observed by the photometer

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