The Very Large Array made the first extrasolar detection of these phenomena on a brown dwarf in July 2015. Events that trigger these non-thunderstorm phenomena have their strength quantified by the NOAA’s G-scale or the K-index. These phenomena can only be observed from two namesake ovals on the Earth's surface and are often visualized through keograms. The intensity of these phenomena on Earth tends to vary over a period of (*) 11 years, mirroring the oscillations in sunspot activity. The emissions spectra of excited nitrogen and oxygen gas following collisions with KeV electrons account for the diverse hues of these phenomena. The solar wind interacts with the Earth's magnetosphere to produce, for 10 points, what flashy displays of light often seen at high latitudes? ■END■
ANSWER: aurorae [accept aurora borealis or aurora australis; accept Northern Lights or Southern Lights; prompt on geomagnetic storms]
<Shiv Seshan, Other Science>
= Average correct buzz position