aurora

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Related to auroral: auroral oval
See: onset
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As a result, the researchers concluded that increased volcanic activity on Io lessens auroral activity in Jupiter's magnetosphere.
The trembling, sparkling colors of auroral arcs were a reminder of this mighty bridge.
Professor Charles Deer, the Geophysical Institute's auroral forecaster, notes a dramatic increase in solar activity due to the upcoming solar max (peak in 11-year sun burst cycle) of 2000-2003.
In Figure 1, the frequency with which Jay has detected auroral activity has been plotted for the years 1982 to 2011.
Our research proved that, during the occurrence of the northern lights, people can hear natural auroral sounds related to what they see.
As activity increases the auroral ring grows, producing more frequent and brilliant displays seen farther south.
Since terrestrial auroras are intimately tied to Earth's magnetic field, it no longer seemed plausible that the ashen light --whatever it was--could be an auroral phenomenon.
some times, we receive an extra-large flare from the Sun, which causes the auroral oval to expand and reach out further south to much lower latitudes.
Solar activity in 2012 was not particularly high despite being close to solar maximum, but auroral displays continued to be seen from August to November, mainly from higher latitudes but with the occasional sighting from England and the Isle of Man.
The process turns on an auroral arc and then these waves develop on both sides of the resonator moving up and down.
The Geophysical Institute of the University of Alaska Fairbanks predicts higher auroral activity tonight.
As the number of sunspots grow we will see an increase in auroral activity, and possibly in more frequent disruptions to our communications systems.