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Precursors that indicate alerts of this potential rise also include increases in: low frequency electromagnetic emission, magnetic field anomalies, earthquake lights from ridges and mountain tops, temperature anomalies over wide areas and changes in plasma density of the ionosphereAs seismic and volcanic activity increases across the planet, such 'earthquake lights' and plasma discharges will likely become more common. For a recent probable plasma (not HAARP - see articles below) discharge activity, check out this youtube video (contains some strong language) published on June 12, 2015 which happened in Greenwood, Indiana USA.
Comment: 'Rare' sightings of noctilucent clouds have also been observed in parts of England and Scotland recently.
SOTT Exclusive: NASA blowing meteor smoke as noctilucent clouds intensify