Fig. 9
From: Geomagnetic and ionospheric response to the interplanetary shock on January 24, 2012
Keogram of 630.0 nm emission intensity (scan angle—UT) produced from the digital image of the NORUSCA hyperspectral all-sky imager (Barentsburg); intensity variations (in Rayleigh) of emissions produced by proton precipitation 486.1 nm (multiplied by 5) and 656.3 nm, and by electron precipitation 557.7, 630.0, and 636.4 nm, riometer (in dB), and geomagnetic (X-component) (in nT) variations at stations HOR and BAR during the time interval 1500–1530 UT