Use thisIceland Northern Lights calendaras a reference, but keep in mind that KP is random and will vary from one year to the next. Also, the calendar above doesn’t show what the level of cloud cover was, a key
Using alternative forced choice designs (AFC), the capacity to localize very brief flashes of light [e.g. [4, 5], to discriminate color and colored stimuli [6,7,8], orientation [8,9,10], form [4, 11], and especially motion [e.g. [12, 13], is found to persist, to a certain...
"Color" is not a wavelength; rather, it is a concept which is associated with a certain stimulus, namely a certain wavelength of light entering the eye. Note that pure yellow light and a combination of red + green light are both associated with the color "yellow" in the brain. This als...